TY  - JOUR
AU  - Jovic, B M
AU  - Jović, Vladimir D.
AU  - Lačnjevac, Uroš
AU  - Stevanović, Sanja
AU  - Kovac, J
AU  - Radovic, M
AU  - Krstajić, Nedeljko V.
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2012
AB  - In this work, the hydrogen evolution reaction (HER) was studied on Ru coated Ti2AlC electrodes in 1.0 mol dm(-3) H2SO4 at 25 degrees C. Ti2AlC was found to be a highly stable substrate in sulfuric acid solutions due to the formation of a passivating oxide layer on the surface, which was confirmed by the X-ray photoelectron spectroscopy (XPS) analysis of as-prepared and anodically treated Ti2AlC samples. Ru films were electrodeposited onto Ti2AlC substrates by cycling the potential of Ti2AlC in the solution containing 0.01 mol dm(-3) RuCl3 + 0.1 mol dm(-3) H2SO4 between -0.5 V and 0.4 V vs. a saturated calomel electrode (SCE) at the sweep rate of 20 mV s(-1). Four Ru/Ti2AlC samples were prepared, obtained at 5, 10, 15 and 20 cycles of Ru electrodeposition. Characterization of samples was performed by scanning electron microscopy (SEM) and cyclic voltammetry (CV), while the thickness of the electrodeposited Ru layers was determined by atomic force microscopy (AFM). It was found that the most compact sample with the thickness of about 0.42 mu m was obtained after 5 cycles. Electrochemical impedance spectroscopy (EIS) and steady-state polarization measurements showed that all Ru/Ti2AlC electrodes were exceptionally active for the HER. A Tafel slope of about -60 mV dec(-1) was observed on all polarization curves in the range of high cathodic current densities. Based on formal kinetics analysis, an appropriate mechanism for the HER on Ru/Ti2AlC was suggested.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions
VL  - 766
SP  - 78
EP  - 86
DO  - 10.1016/j.jelechem.2016.01.038
ER  - 

@article{
author = "Jovic, B M and Jović, Vladimir D. and Lačnjevac, Uroš and Stevanović, Sanja and Kovac, J and Radovic, M and Krstajić, Nedeljko V.",
year = "2016",
abstract = "In this work, the hydrogen evolution reaction (HER) was studied on Ru coated Ti2AlC electrodes in 1.0 mol dm(-3) H2SO4 at 25 degrees C. Ti2AlC was found to be a highly stable substrate in sulfuric acid solutions due to the formation of a passivating oxide layer on the surface, which was confirmed by the X-ray photoelectron spectroscopy (XPS) analysis of as-prepared and anodically treated Ti2AlC samples. Ru films were electrodeposited onto Ti2AlC substrates by cycling the potential of Ti2AlC in the solution containing 0.01 mol dm(-3) RuCl3 + 0.1 mol dm(-3) H2SO4 between -0.5 V and 0.4 V vs. a saturated calomel electrode (SCE) at the sweep rate of 20 mV s(-1). Four Ru/Ti2AlC samples were prepared, obtained at 5, 10, 15 and 20 cycles of Ru electrodeposition. Characterization of samples was performed by scanning electron microscopy (SEM) and cyclic voltammetry (CV), while the thickness of the electrodeposited Ru layers was determined by atomic force microscopy (AFM). It was found that the most compact sample with the thickness of about 0.42 mu m was obtained after 5 cycles. Electrochemical impedance spectroscopy (EIS) and steady-state polarization measurements showed that all Ru/Ti2AlC electrodes were exceptionally active for the HER. A Tafel slope of about -60 mV dec(-1) was observed on all polarization curves in the range of high cathodic current densities. Based on formal kinetics analysis, an appropriate mechanism for the HER on Ru/Ti2AlC was suggested.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions",
volume = "766",
pages = "78-86",
doi = "10.1016/j.jelechem.2016.01.038"
}

Jovic, B. M., Jović, V. D., Lačnjevac, U., Stevanović, S., Kovac, J., Radovic, M.,& Krstajić, N. V.. (2016). Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions. in Journal of Electroanalytical Chemistry
Elsevier., 766, 78-86.
https://doi.org/10.1016/j.jelechem.2016.01.038

Jovic BM, Jović VD, Lačnjevac U, Stevanović S, Kovac J, Radovic M, Krstajić NV. Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions. in Journal of Electroanalytical Chemistry. 2016;766:78-86.
doi:10.1016/j.jelechem.2016.01.038 .

Jovic, B M, Jović, Vladimir D., Lačnjevac, Uroš, Stevanović, Sanja, Kovac, J, Radovic, M, Krstajić, Nedeljko V., "Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions" in Journal of Electroanalytical Chemistry, 766 (2016):78-86,
https://doi.org/10.1016/j.jelechem.2016.01.038 . .

TY  - JOUR
AU  - Jovic, B M
AU  - Jović, Vladimir D.
AU  - Lačnjevac, Uroš
AU  - Stevanović, Sanja
AU  - Kovac, J
AU  - Radovic, M
AU  - Krstajić, Nedeljko V.
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4297
AB  - In this work, the hydrogen evolution reaction (HER) was studied on Ru coated Ti2AlC electrodes in 1.0 mol dm(-3) H2SO4 at 25 degrees C. Ti2AlC was found to be a highly stable substrate in sulfuric acid solutions due to the formation of a passivating oxide layer on the surface, which was confirmed by the X-ray photoelectron spectroscopy (XPS) analysis of as-prepared and anodically treated Ti2AlC samples. Ru films were electrodeposited onto Ti2AlC substrates by cycling the potential of Ti2AlC in the solution containing 0.01 mol dm(-3) RuCl3 + 0.1 mol dm(-3) H2SO4 between -0.5 V and 0.4 V vs. a saturated calomel electrode (SCE) at the sweep rate of 20 mV s(-1). Four Ru/Ti2AlC samples were prepared, obtained at 5, 10, 15 and 20 cycles of Ru electrodeposition. Characterization of samples was performed by scanning electron microscopy (SEM) and cyclic voltammetry (CV), while the thickness of the electrodeposited Ru layers was determined by atomic force microscopy (AFM). It was found that the most compact sample with the thickness of about 0.42 mu m was obtained after 5 cycles. Electrochemical impedance spectroscopy (EIS) and steady-state polarization measurements showed that all Ru/Ti2AlC electrodes were exceptionally active for the HER. A Tafel slope of about -60 mV dec(-1) was observed on all polarization curves in the range of high cathodic current densities. Based on formal kinetics analysis, an appropriate mechanism for the HER on Ru/Ti2AlC was suggested.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions
VL  - 766
SP  - 78
EP  - 86
DO  - 10.1016/j.jelechem.2016.01.038
ER  - 

@article{
author = "Jovic, B M and Jović, Vladimir D. and Lačnjevac, Uroš and Stevanović, Sanja and Kovac, J and Radovic, M and Krstajić, Nedeljko V.",
year = "2016",
abstract = "In this work, the hydrogen evolution reaction (HER) was studied on Ru coated Ti2AlC electrodes in 1.0 mol dm(-3) H2SO4 at 25 degrees C. Ti2AlC was found to be a highly stable substrate in sulfuric acid solutions due to the formation of a passivating oxide layer on the surface, which was confirmed by the X-ray photoelectron spectroscopy (XPS) analysis of as-prepared and anodically treated Ti2AlC samples. Ru films were electrodeposited onto Ti2AlC substrates by cycling the potential of Ti2AlC in the solution containing 0.01 mol dm(-3) RuCl3 + 0.1 mol dm(-3) H2SO4 between -0.5 V and 0.4 V vs. a saturated calomel electrode (SCE) at the sweep rate of 20 mV s(-1). Four Ru/Ti2AlC samples were prepared, obtained at 5, 10, 15 and 20 cycles of Ru electrodeposition. Characterization of samples was performed by scanning electron microscopy (SEM) and cyclic voltammetry (CV), while the thickness of the electrodeposited Ru layers was determined by atomic force microscopy (AFM). It was found that the most compact sample with the thickness of about 0.42 mu m was obtained after 5 cycles. Electrochemical impedance spectroscopy (EIS) and steady-state polarization measurements showed that all Ru/Ti2AlC electrodes were exceptionally active for the HER. A Tafel slope of about -60 mV dec(-1) was observed on all polarization curves in the range of high cathodic current densities. Based on formal kinetics analysis, an appropriate mechanism for the HER on Ru/Ti2AlC was suggested.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions",
volume = "766",
pages = "78-86",
doi = "10.1016/j.jelechem.2016.01.038"
}

Jovic, B. M., Jović, V. D., Lačnjevac, U., Stevanović, S., Kovac, J., Radovic, M.,& Krstajić, N. V.. (2016). Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions. in Journal of Electroanalytical Chemistry
Elsevier., 766, 78-86.
https://doi.org/10.1016/j.jelechem.2016.01.038

Jovic BM, Jović VD, Lačnjevac U, Stevanović S, Kovac J, Radovic M, Krstajić NV. Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions. in Journal of Electroanalytical Chemistry. 2016;766:78-86.
doi:10.1016/j.jelechem.2016.01.038 .

Jovic, B M, Jović, Vladimir D., Lačnjevac, Uroš, Stevanović, Sanja, Kovac, J, Radovic, M, Krstajić, Nedeljko V., "Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions" in Journal of Electroanalytical Chemistry, 766 (2016):78-86,
https://doi.org/10.1016/j.jelechem.2016.01.038 . .

TY  - CONF
AU  - Gajić Krstajić, Ljiljana
AU  - Zabinski, Piotr
AU  - Radmilović, Velimir R.
AU  - Ercius, Peter
AU  - Krstajić Pajić, Mila N.
AU  - Lačnjevac, Uroš
AU  - Krstajić, Nedeljko
AU  - Elezović, Nevenka
PY  - 2016
UR  - http://dais.sanu.ac.rs/123456789/895
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2862
AB  - Tungsten carbide was prepared by polycondensation of resorcinol and formaldehyde in the presence cetyltrimethylammonium bromide (CTABr) surfactant. Pd nanocatalyst at this support was synthesized by borohydride reduction method. The obtained materials were characterized by XRD, HRTEM, EELS, XPS and electrochemical measurements. TEM analysis revealed Pd nanoparticles size in the range of a few nanometers, even the clusters of Pd atoms. X-Ray Photoelectron Spectroscopy was applied to determine surface composition of the substrates. The presence of palladium based species was revealed. The catalytic activity for the hydrogen oxidation reaction and oxygen reduction were investigated in 0.5 M HClO4 by cyclic voltammetry and linear sweep voltammetry at the rotating disc electrode. The catalysts’ activities were compared to the carbon supported Pd nanoparticles (Vulcan XC 72). WC supported Pd nanoparticles have shown higher CO tolerance, compared even to Pt based catalyst. Acknowledgements: This work was financially supported by Ministry of Education, Science and Technological Development, Republic of Serbia, contract No. 172054.The authors would like to acknowledge networking support by the COST Action MP1407.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016
T1  - Synthesis and characterization of Pd nanocatalyst at tungsten carbide based support for fuel cells application
SP  - 71
EP  - 71
UR  - https://hdl.handle.net/21.15107/rcub_dais_895
ER  - 

@conference{
author = "Gajić Krstajić, Ljiljana and Zabinski, Piotr and Radmilović, Velimir R. and Ercius, Peter and Krstajić Pajić, Mila N. and Lačnjevac, Uroš and Krstajić, Nedeljko and Elezović, Nevenka",
year = "2016",
abstract = "Tungsten carbide was prepared by polycondensation of resorcinol and formaldehyde in the presence cetyltrimethylammonium bromide (CTABr) surfactant. Pd nanocatalyst at this support was synthesized by borohydride reduction method. The obtained materials were characterized by XRD, HRTEM, EELS, XPS and electrochemical measurements. TEM analysis revealed Pd nanoparticles size in the range of a few nanometers, even the clusters of Pd atoms. X-Ray Photoelectron Spectroscopy was applied to determine surface composition of the substrates. The presence of palladium based species was revealed. The catalytic activity for the hydrogen oxidation reaction and oxygen reduction were investigated in 0.5 M HClO4 by cyclic voltammetry and linear sweep voltammetry at the rotating disc electrode. The catalysts’ activities were compared to the carbon supported Pd nanoparticles (Vulcan XC 72). WC supported Pd nanoparticles have shown higher CO tolerance, compared even to Pt based catalyst. Acknowledgements: This work was financially supported by Ministry of Education, Science and Technological Development, Republic of Serbia, contract No. 172054.The authors would like to acknowledge networking support by the COST Action MP1407.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016",
title = "Synthesis and characterization of Pd nanocatalyst at tungsten carbide based support for fuel cells application",
pages = "71-71",
url = "https://hdl.handle.net/21.15107/rcub_dais_895"
}

Gajić Krstajić, L., Zabinski, P., Radmilović, V. R., Ercius, P., Krstajić Pajić, M. N., Lačnjevac, U., Krstajić, N.,& Elezović, N.. (2016). Synthesis and characterization of Pd nanocatalyst at tungsten carbide based support for fuel cells application. in Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016
Belgrade : Materials Research Society of Serbia., 71-71.
https://hdl.handle.net/21.15107/rcub_dais_895

Gajić Krstajić L, Zabinski P, Radmilović VR, Ercius P, Krstajić Pajić MN, Lačnjevac U, Krstajić N, Elezović N. Synthesis and characterization of Pd nanocatalyst at tungsten carbide based support for fuel cells application. in Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016. 2016;:71-71.
https://hdl.handle.net/21.15107/rcub_dais_895 .

Gajić Krstajić, Ljiljana, Zabinski, Piotr, Radmilović, Velimir R., Ercius, Peter, Krstajić Pajić, Mila N., Lačnjevac, Uroš, Krstajić, Nedeljko, Elezović, Nevenka, "Synthesis and characterization of Pd nanocatalyst at tungsten carbide based support for fuel cells application" in Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016 (2016):71-71,
https://hdl.handle.net/21.15107/rcub_dais_895 .

TY  - JOUR
AU  - Obradović, Maja
AU  - Lačnjevac, Uroš
AU  - Babic, B M
AU  - Ercius, P
AU  - Radmilović, Velimir R.
AU  - Krstajić, Nedeljko V.
AU  - Gojković, Snežana Lj.
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1763
AB  - Two binary Ru-Ti oxides, Rum Ti0.9O2 and Ru0.7Ti0.3O2, were synthesized by the sol-gel method and used as an electrocatalyst support. The system was characterized by XRD, EDS, TEM and cyclic voltammetry. The Rum Ti0.9O2 and Ru0.7Ti0.3O2 consist of two phases of anatase and rutile structure. An average size of the Pt nanoparticles supported on them is similar to 3.5 nm and they are deposited on both Ru and Ti-rich domains. The supports exhibited good conductivity and electrochemical stability. The onset potentials of COads oxidation on the synthesized catalysts and on commercial PtRu/C are similar to each other and lower than that on Pt/C. This suggests that in Pt/Rum Ti0.9O2 and Pt/Ru0(.7)Ti(0.3)O(2) the Pt nanoparticles are in close contact with Ru atoms from the support, which enables the bifunctional mechanism. The activity and stability of the catalysts for methanol oxidation were examined under potentiodynamic and potentiostatic conditions. While the activity of Pt/Rum Ti0.9O2 is unsatisfactory, the performance of Pt/Ru0.7Ti0.3O2 is comparable to PtRu/C. For example, in the potentiostatic test at 0.5 V the activities after 25 min are 0.035 mA cm(-2) and 0.022 mA cm(-2) for Pt/Ru0.7Ti0.3O2 and PtRu/C, respectively. In potentiodynamic test the activities at 0.5V after 250 cycles are around 0.02 mA cm(-2) for both catalysts.
PB  - Elsevier
T2  - Applied Catalysis B-Environmental
T1  - RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation
VL  - 170
SP  - 144
EP  - 152
DO  - 10.1016/j.apcatb.2015.01.038
ER  - 

@article{
author = "Obradović, Maja and Lačnjevac, Uroš and Babic, B M and Ercius, P and Radmilović, Velimir R. and Krstajić, Nedeljko V. and Gojković, Snežana Lj.",
year = "2015",
abstract = "Two binary Ru-Ti oxides, Rum Ti0.9O2 and Ru0.7Ti0.3O2, were synthesized by the sol-gel method and used as an electrocatalyst support. The system was characterized by XRD, EDS, TEM and cyclic voltammetry. The Rum Ti0.9O2 and Ru0.7Ti0.3O2 consist of two phases of anatase and rutile structure. An average size of the Pt nanoparticles supported on them is similar to 3.5 nm and they are deposited on both Ru and Ti-rich domains. The supports exhibited good conductivity and electrochemical stability. The onset potentials of COads oxidation on the synthesized catalysts and on commercial PtRu/C are similar to each other and lower than that on Pt/C. This suggests that in Pt/Rum Ti0.9O2 and Pt/Ru0(.7)Ti(0.3)O(2) the Pt nanoparticles are in close contact with Ru atoms from the support, which enables the bifunctional mechanism. The activity and stability of the catalysts for methanol oxidation were examined under potentiodynamic and potentiostatic conditions. While the activity of Pt/Rum Ti0.9O2 is unsatisfactory, the performance of Pt/Ru0.7Ti0.3O2 is comparable to PtRu/C. For example, in the potentiostatic test at 0.5 V the activities after 25 min are 0.035 mA cm(-2) and 0.022 mA cm(-2) for Pt/Ru0.7Ti0.3O2 and PtRu/C, respectively. In potentiodynamic test the activities at 0.5V after 250 cycles are around 0.02 mA cm(-2) for both catalysts.",
publisher = "Elsevier",
journal = "Applied Catalysis B-Environmental",
title = "RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation",
volume = "170",
pages = "144-152",
doi = "10.1016/j.apcatb.2015.01.038"
}

Obradović, M., Lačnjevac, U., Babic, B. M., Ercius, P., Radmilović, V. R., Krstajić, N. V.,& Gojković, S. Lj.. (2015). RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation. in Applied Catalysis B-Environmental
Elsevier., 170, 144-152.
https://doi.org/10.1016/j.apcatb.2015.01.038

Obradović M, Lačnjevac U, Babic BM, Ercius P, Radmilović VR, Krstajić NV, Gojković SL. RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation. in Applied Catalysis B-Environmental. 2015;170:144-152.
doi:10.1016/j.apcatb.2015.01.038 .

Obradović, Maja, Lačnjevac, Uroš, Babic, B M, Ercius, P, Radmilović, Velimir R., Krstajić, Nedeljko V., Gojković, Snežana Lj., "RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation" in Applied Catalysis B-Environmental, 170 (2015):144-152,
https://doi.org/10.1016/j.apcatb.2015.01.038 . .

TY  - JOUR
AU  - Obradović, Maja
AU  - Babić, Biljana M.
AU  - Krstajić, Nedeljko V.
AU  - Gojković, Snežana Lj.
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1166
AB  - Tungsten carbide was synthesized by calcination of carbon cryogel with embedded tungsten in a form of metatungstate. This material was used as a support for Pt nanoparticles. XRD pattern of W-C support indicated the presence of WC, W2C, and unreacted W, as well as graphitized carbon. According to previous TEM analysis of W-C support, it contains particles with core-shell structure, where the W particle was covered with the shell of a mixture of WC and W2C. The average Pt grain size calculated from XRD pattern was about 6 nm. A cyclic voltammogram of W-C support was recorded within the potential range relevant for its application as a catalyst support in fuel cells. The pair of anodic/cathodic peaks close to the negative potential limit could be ascribed to the intercalation of hydrogen within hydrous tungsten oxide, which is always present on the surface of WC in aqueous solutions. The cyclic voltammogram of Pt/W-C indicated that tungsten oxide species are present on tungsten carbide shell as well as on the surface of Pt nanoparticles. The Pt surface is only partially covered by hydrous tungsten oxide. Hydrogen intercalation in hydrous tungsten oxide is enhanced in the presence of Pt nanoparticles. Also, the presence of hydrated tungsten oxide leads to the decrease of OH chemisorbed on Pt surface. Stripping of underpotentially deposited copper was used for the assessment of Pt surface area and the specific surface area of Pt was estimated to be 41 m2 g-1. The electrochemical oxygen reduction reaction was examined on the synthesized Pt/W-C catalyst and compared with the results on the commercial Pt/C catalyst. It was found that the current densities at Pt/W-C were almost twice as high as those on Pt/C. The Tafel plots for both catalysts are characterized with two Tafel slopes: -0.060 V dec-1 at low current densities, and -0.120 V dec-1 at high current densities. From the rotational dependence of the reaction rate, it was found that oxygen reduction on both Pt/W-C and Pt/C follows the first order kinetics with respect to O2 and that four electrons are transferred per O2 molecule. The results show that the presence of tungsten carbide in support material, i.e. hydrous tungsten oxide on Pt surface, leads to promotion of oxygen reduction on the Pt/W-C catalyst. It was assumed that oxophilic hydrated tungsten oxide hinders OH adsorption on Pt surface, thus increasing Pt surface area available for O2 adsorption and its electrochemical reduction.
AB  - Sintetizovan je nosač katalizatora u kojem se na ugljeničnoj osnovi nalaze nanočestice metalnog volframa obavijene volfram-karbidom i na njega su nanete nanočestice Pt. Karakterizacija sintetizovanog uzorka cikličnom voltametrijom u kiseloj sredini ukazala je na oksidaciju volframovih vrsta iz nosača i formiranje hidratisanih oksidnih vrsta volframa na površini Pt. Elektrohemijska redukcija O2 u kiseloj sredini je ispitivana na sintetizovanom uzorku i rezultati su upoređeni sa komercijalnim katalizatorom u kojem su nanočestice Pt na nosaču od ugljenika razvijene površine. Pokazano je da redukcija O2, bez obzira na nosač katalizatora, sledi kinetiku prvog reda po O2 uz razmenu četiri elektrona, ali da su gustine struje veće u slučaju nosača sa volfram-karbidom. Povećana aktivnost sintetizovanog katalizatora je posledica prisustva oksofiličnih hidratisanih oksida volframa koji sprečavaju adsorpciju hidratisanog oksida na površini Pt i tako povećavaju površinu Pt dostupnu za adsorpciju i redukciju molekula kiseonika.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Effect of tungsten carbide in carbon Pt catalyst support on electrochemical oxygen reduction in acid solution
T1  - Uticaj prisustva volfram-karbida u ugljeničnom nosaču Pt nanočestica na elektrohemijsku redukciju kiseonika u kiselom rastvoru
VL  - 67
IS  - 2
SP  - 303
EP  - 311
DO  - 10.2298/HEMIND120307063O
ER  - 

@article{
author = "Obradović, Maja and Babić, Biljana M. and Krstajić, Nedeljko V. and Gojković, Snežana Lj.",
year = "2013",
abstract = "Tungsten carbide was synthesized by calcination of carbon cryogel with embedded tungsten in a form of metatungstate. This material was used as a support for Pt nanoparticles. XRD pattern of W-C support indicated the presence of WC, W2C, and unreacted W, as well as graphitized carbon. According to previous TEM analysis of W-C support, it contains particles with core-shell structure, where the W particle was covered with the shell of a mixture of WC and W2C. The average Pt grain size calculated from XRD pattern was about 6 nm. A cyclic voltammogram of W-C support was recorded within the potential range relevant for its application as a catalyst support in fuel cells. The pair of anodic/cathodic peaks close to the negative potential limit could be ascribed to the intercalation of hydrogen within hydrous tungsten oxide, which is always present on the surface of WC in aqueous solutions. The cyclic voltammogram of Pt/W-C indicated that tungsten oxide species are present on tungsten carbide shell as well as on the surface of Pt nanoparticles. The Pt surface is only partially covered by hydrous tungsten oxide. Hydrogen intercalation in hydrous tungsten oxide is enhanced in the presence of Pt nanoparticles. Also, the presence of hydrated tungsten oxide leads to the decrease of OH chemisorbed on Pt surface. Stripping of underpotentially deposited copper was used for the assessment of Pt surface area and the specific surface area of Pt was estimated to be 41 m2 g-1. The electrochemical oxygen reduction reaction was examined on the synthesized Pt/W-C catalyst and compared with the results on the commercial Pt/C catalyst. It was found that the current densities at Pt/W-C were almost twice as high as those on Pt/C. The Tafel plots for both catalysts are characterized with two Tafel slopes: -0.060 V dec-1 at low current densities, and -0.120 V dec-1 at high current densities. From the rotational dependence of the reaction rate, it was found that oxygen reduction on both Pt/W-C and Pt/C follows the first order kinetics with respect to O2 and that four electrons are transferred per O2 molecule. The results show that the presence of tungsten carbide in support material, i.e. hydrous tungsten oxide on Pt surface, leads to promotion of oxygen reduction on the Pt/W-C catalyst. It was assumed that oxophilic hydrated tungsten oxide hinders OH adsorption on Pt surface, thus increasing Pt surface area available for O2 adsorption and its electrochemical reduction., Sintetizovan je nosač katalizatora u kojem se na ugljeničnoj osnovi nalaze nanočestice metalnog volframa obavijene volfram-karbidom i na njega su nanete nanočestice Pt. Karakterizacija sintetizovanog uzorka cikličnom voltametrijom u kiseloj sredini ukazala je na oksidaciju volframovih vrsta iz nosača i formiranje hidratisanih oksidnih vrsta volframa na površini Pt. Elektrohemijska redukcija O2 u kiseloj sredini je ispitivana na sintetizovanom uzorku i rezultati su upoređeni sa komercijalnim katalizatorom u kojem su nanočestice Pt na nosaču od ugljenika razvijene površine. Pokazano je da redukcija O2, bez obzira na nosač katalizatora, sledi kinetiku prvog reda po O2 uz razmenu četiri elektrona, ali da su gustine struje veće u slučaju nosača sa volfram-karbidom. Povećana aktivnost sintetizovanog katalizatora je posledica prisustva oksofiličnih hidratisanih oksida volframa koji sprečavaju adsorpciju hidratisanog oksida na površini Pt i tako povećavaju površinu Pt dostupnu za adsorpciju i redukciju molekula kiseonika.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Effect of tungsten carbide in carbon Pt catalyst support on electrochemical oxygen reduction in acid solution, Uticaj prisustva volfram-karbida u ugljeničnom nosaču Pt nanočestica na elektrohemijsku redukciju kiseonika u kiselom rastvoru",
volume = "67",
number = "2",
pages = "303-311",
doi = "10.2298/HEMIND120307063O"
}

Obradović, M., Babić, B. M., Krstajić, N. V.,& Gojković, S. Lj.. (2013). Effect of tungsten carbide in carbon Pt catalyst support on electrochemical oxygen reduction in acid solution. in Hemijska industrija
Association of Chemical Engineers of Serbia., 67(2), 303-311.
https://doi.org/10.2298/HEMIND120307063O

Obradović M, Babić BM, Krstajić NV, Gojković SL. Effect of tungsten carbide in carbon Pt catalyst support on electrochemical oxygen reduction in acid solution. in Hemijska industrija. 2013;67(2):303-311.
doi:10.2298/HEMIND120307063O .

Obradović, Maja, Babić, Biljana M., Krstajić, Nedeljko V., Gojković, Snežana Lj., "Effect of tungsten carbide in carbon Pt catalyst support on electrochemical oxygen reduction in acid solution" in Hemijska industrija, 67, no. 2 (2013):303-311,
https://doi.org/10.2298/HEMIND120307063O . .

TY  - JOUR
AU  - Krstajić, Mila N.
AU  - Obradović, Maja
AU  - Babić, Biljana M.
AU  - Radmilović, Velimir R.
AU  - Lačnjevac, Uroš
AU  - Krstajić, Nedeljko V.
AU  - Gojković, Snežana Lj.
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1232
AB  - Ru-doped SnO2 powder, (RuxSn1-x)O2, with a Sn:Ru atomic ratio of 9:1 was synthesized and used as a support for Pt nanoparticles (30 mass % loading). The (RuxSn1-x)O2 support and the Pt/(RuxSn1-x)O2 catalyst were characterized by X-ray diffraction measurements, energy dispersive X-ray spectroscopy and transmission electron microscopy (TEM). The (RuxSn1-x)O2 was found to be a two-phase material consisting of probably a solid solution of RuO2 in SnO2 and pure RuO2. The average Pt particle size determined by TEM was 5.3 nm. Cyclic voltammetry of Pt/(RuxSn1-x)O2 indicated good conductivity of the support and displayed the usual features of Pt. The results of the electrochemical oxidation of COads and methanol on Pt/(RuxSn1-x)O2 were compared with those on commercial Pt/C and PtRu/C catalysts. Oxidation of COads on Pt/(RuxSn1-x)O2 starts at lower positive potentials than on PtRu/C and Pt/C. Potentiodynamic polarization curves and chronoamperometric curves of methanol oxidation indicated higher initial activity of the Pt/(RuxSn1-x)O2 catalyst compared to PtRu/C, but also a greater loss in current density over time. A potentiodynamic stability test of the catalysts revealed that deactivation of Pt/(RuxSn1-x)O2 and Pt/C was primarily caused by poisoning of the Pt surface by residues of methanol oxidation, which mostly occurred during the first potential cycle. In the case of PtRu/C, the poisoning of the surface was minor and deactivation was caused by surface area loss of the PtRu.
AB  - Sintetizovan je prah SnO2 dopovan rutenijumom, (RuxSn1-x)O2, sa atomskim odnosom Sn:Ru od 9:1, i korišćen kao nosač nanočestica platine. Udeo Pt u dobijenom katalizatoru, Pt/(RuxSn1-x)O2, bio je 30 mas. %. Nosač i katalizator su karakterisani difrakcijom X-zraka, energetski disperzivnom spektroskopijom X-zraka i transmisionom elektronskom mikroskopijom (TEM). Pokazano je da je (RuxSn1-x)O2 dvofazni materijal koji verovatno sadrži čvrst rastvor RuO2 u SnO2 i čist RuO2. Prosečna veličina zrna Pt, određena TEM analizom, iznosi 5,3 nm. Ciklična voltametrija Pt/(RuxSn1-x)O2 ukazala je na dobru provodnost nosača katalizatora i na uobičajene karakteristike Pt. Upoređeni su rezultati elektrohemijske oksidacije COads na Pt/(RuxSn1-x)O2, Pt/C i PtRu/C. Oksidacija COads na Pt/(RuxSn1-x)O2 počinje na negativnijim potencijalima u odnosu na PtRu/C i Pt/C. Potenciodinamičke polarizacione krive i hronoamperometrijske krive za oksidaciju metanola ukazuju na veću početnu aktivnost katalizatora Pt/(RuxSn1-x)O2 u odnosu na PtRu/C, ali i na veće smanjenje gustine struje tokom vremena. Test potenciodinamičke stabilnosti katalizatora je ukazao da je smanjenje aktivnosti Pt/(RuxSn1-x)O2 i Pt/C prvenstveno prouzrokovano trovanjem površine Pt proizvodima nepotpune oksidacije metanola, koje se uglavnom odigrava tokom prvog ciklusa. Kod PtRu/C trovanje površine je minimalno, a smanjenje aktivnosti je prouzrokovano smanjenjem elektrohemijski aktivne površine PtRu.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst
T1  - Elektrohemijska oksidacija metanola na katalizatoru Pt/(RuxSn1-x)O2
VL  - 78
IS  - 11
SP  - 1703
EP  - 1716
DO  - 10.2298/JSC130718091K
ER  - 

@article{
author = "Krstajić, Mila N. and Obradović, Maja and Babić, Biljana M. and Radmilović, Velimir R. and Lačnjevac, Uroš and Krstajić, Nedeljko V. and Gojković, Snežana Lj.",
year = "2013",
abstract = "Ru-doped SnO2 powder, (RuxSn1-x)O2, with a Sn:Ru atomic ratio of 9:1 was synthesized and used as a support for Pt nanoparticles (30 mass % loading). The (RuxSn1-x)O2 support and the Pt/(RuxSn1-x)O2 catalyst were characterized by X-ray diffraction measurements, energy dispersive X-ray spectroscopy and transmission electron microscopy (TEM). The (RuxSn1-x)O2 was found to be a two-phase material consisting of probably a solid solution of RuO2 in SnO2 and pure RuO2. The average Pt particle size determined by TEM was 5.3 nm. Cyclic voltammetry of Pt/(RuxSn1-x)O2 indicated good conductivity of the support and displayed the usual features of Pt. The results of the electrochemical oxidation of COads and methanol on Pt/(RuxSn1-x)O2 were compared with those on commercial Pt/C and PtRu/C catalysts. Oxidation of COads on Pt/(RuxSn1-x)O2 starts at lower positive potentials than on PtRu/C and Pt/C. Potentiodynamic polarization curves and chronoamperometric curves of methanol oxidation indicated higher initial activity of the Pt/(RuxSn1-x)O2 catalyst compared to PtRu/C, but also a greater loss in current density over time. A potentiodynamic stability test of the catalysts revealed that deactivation of Pt/(RuxSn1-x)O2 and Pt/C was primarily caused by poisoning of the Pt surface by residues of methanol oxidation, which mostly occurred during the first potential cycle. In the case of PtRu/C, the poisoning of the surface was minor and deactivation was caused by surface area loss of the PtRu., Sintetizovan je prah SnO2 dopovan rutenijumom, (RuxSn1-x)O2, sa atomskim odnosom Sn:Ru od 9:1, i korišćen kao nosač nanočestica platine. Udeo Pt u dobijenom katalizatoru, Pt/(RuxSn1-x)O2, bio je 30 mas. %. Nosač i katalizator su karakterisani difrakcijom X-zraka, energetski disperzivnom spektroskopijom X-zraka i transmisionom elektronskom mikroskopijom (TEM). Pokazano je da je (RuxSn1-x)O2 dvofazni materijal koji verovatno sadrži čvrst rastvor RuO2 u SnO2 i čist RuO2. Prosečna veličina zrna Pt, određena TEM analizom, iznosi 5,3 nm. Ciklična voltametrija Pt/(RuxSn1-x)O2 ukazala je na dobru provodnost nosača katalizatora i na uobičajene karakteristike Pt. Upoređeni su rezultati elektrohemijske oksidacije COads na Pt/(RuxSn1-x)O2, Pt/C i PtRu/C. Oksidacija COads na Pt/(RuxSn1-x)O2 počinje na negativnijim potencijalima u odnosu na PtRu/C i Pt/C. Potenciodinamičke polarizacione krive i hronoamperometrijske krive za oksidaciju metanola ukazuju na veću početnu aktivnost katalizatora Pt/(RuxSn1-x)O2 u odnosu na PtRu/C, ali i na veće smanjenje gustine struje tokom vremena. Test potenciodinamičke stabilnosti katalizatora je ukazao da je smanjenje aktivnosti Pt/(RuxSn1-x)O2 i Pt/C prvenstveno prouzrokovano trovanjem površine Pt proizvodima nepotpune oksidacije metanola, koje se uglavnom odigrava tokom prvog ciklusa. Kod PtRu/C trovanje površine je minimalno, a smanjenje aktivnosti je prouzrokovano smanjenjem elektrohemijski aktivne površine PtRu.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst, Elektrohemijska oksidacija metanola na katalizatoru Pt/(RuxSn1-x)O2",
volume = "78",
number = "11",
pages = "1703-1716",
doi = "10.2298/JSC130718091K"
}

Krstajić, M. N., Obradović, M., Babić, B. M., Radmilović, V. R., Lačnjevac, U., Krstajić, N. V.,& Gojković, S. Lj.. (2013). Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 78(11), 1703-1716.
https://doi.org/10.2298/JSC130718091K

Krstajić MN, Obradović M, Babić BM, Radmilović VR, Lačnjevac U, Krstajić NV, Gojković SL. Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst. in Journal of the Serbian Chemical Society. 2013;78(11):1703-1716.
doi:10.2298/JSC130718091K .

Krstajić, Mila N., Obradović, Maja, Babić, Biljana M., Radmilović, Velimir R., Lačnjevac, Uroš, Krstajić, Nedeljko V., Gojković, Snežana Lj., "Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst" in Journal of the Serbian Chemical Society, 78, no. 11 (2013):1703-1716,
https://doi.org/10.2298/JSC130718091K . .

TY  - JOUR
AU  - Obradović, Maja
AU  - Gojković, Snežana Lj.
AU  - Elezović, Nevenka R.
AU  - Ercius, P.
AU  - Radmilović, Velimir R.
AU  - Vracar, Lj. D.
AU  - Krstajić, Nedeljko V.
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/948
AB  - The catalytic activity of WC/Pt electrocatalysts towards hydrogen oxidation reaction (HOR) in acid solution was studied. Tungsten carbide (WC) prepared by polycondensation of resorcinol and formaldehyde in the presence of ammonium metatungstate salt and CTABr surfactant was used as the support of a Pt electrocatalyst (WC/Pt). The obtained WC/Pt electrodes were characterized by XRD, HRTEM, EDS, EELS and electrochemical measurements. HRTEM analysis showed that the WC particles possess a core-shell structure with a metallic tungsten core and a shell composed of a mixture of tungsten carbides shell (WC and W2C). The WC/Pt catalyst is composed of well-dispersed sub-nanometer Pt clusters which consist of a few to several tens of Pt atoms. EELS measurements indicate that the WC particles function as nucleation sites for Pt nanoparticles. Based on the Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations were derived to describe the HOR current-potential behavior over the entire potential region on RDE. The fitting showed that in the lower potential region HOR on Pt proceeds most likely via the Tafel-Volmer (TV) pathway. The kinetic results also showed that the WC/Pt(1%) when compared to the standard C/Pt(1%) electrode led to a remarkable enhancement of the hydrogen oxidation in an acidic medium, which was explained by H-spill-over between platinum and tungsten carbide.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles
VL  - 671
SP  - 24
EP  - 32
DO  - 10.1016/j.jelechem.2012.01.026
ER  - 

@article{
author = "Obradović, Maja and Gojković, Snežana Lj. and Elezović, Nevenka R. and Ercius, P. and Radmilović, Velimir R. and Vracar, Lj. D. and Krstajić, Nedeljko V.",
year = "2012",
abstract = "The catalytic activity of WC/Pt electrocatalysts towards hydrogen oxidation reaction (HOR) in acid solution was studied. Tungsten carbide (WC) prepared by polycondensation of resorcinol and formaldehyde in the presence of ammonium metatungstate salt and CTABr surfactant was used as the support of a Pt electrocatalyst (WC/Pt). The obtained WC/Pt electrodes were characterized by XRD, HRTEM, EDS, EELS and electrochemical measurements. HRTEM analysis showed that the WC particles possess a core-shell structure with a metallic tungsten core and a shell composed of a mixture of tungsten carbides shell (WC and W2C). The WC/Pt catalyst is composed of well-dispersed sub-nanometer Pt clusters which consist of a few to several tens of Pt atoms. EELS measurements indicate that the WC particles function as nucleation sites for Pt nanoparticles. Based on the Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations were derived to describe the HOR current-potential behavior over the entire potential region on RDE. The fitting showed that in the lower potential region HOR on Pt proceeds most likely via the Tafel-Volmer (TV) pathway. The kinetic results also showed that the WC/Pt(1%) when compared to the standard C/Pt(1%) electrode led to a remarkable enhancement of the hydrogen oxidation in an acidic medium, which was explained by H-spill-over between platinum and tungsten carbide.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles",
volume = "671",
pages = "24-32",
doi = "10.1016/j.jelechem.2012.01.026"
}

Obradović, M., Gojković, S. Lj., Elezović, N. R., Ercius, P., Radmilović, V. R., Vracar, Lj. D.,& Krstajić, N. V.. (2012). The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles. in Journal of Electroanalytical Chemistry
Elsevier., 671, 24-32.
https://doi.org/10.1016/j.jelechem.2012.01.026

Obradović M, Gojković SL, Elezović NR, Ercius P, Radmilović VR, Vracar LD, Krstajić NV. The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles. in Journal of Electroanalytical Chemistry. 2012;671:24-32.
doi:10.1016/j.jelechem.2012.01.026 .

Obradović, Maja, Gojković, Snežana Lj., Elezović, Nevenka R., Ercius, P., Radmilović, Velimir R., Vracar, Lj. D., Krstajić, Nedeljko V., "The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles" in Journal of Electroanalytical Chemistry, 671 (2012):24-32,
https://doi.org/10.1016/j.jelechem.2012.01.026 . .

TY  - JOUR
AU  - Obradović, Maja
AU  - Babić, Biljana M.
AU  - Radmilović, Velimir R.
AU  - Krstajić, Nedeljko V.
AU  - Gojković, Snežana Lj.
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/977
AB  - Tungsten carbide was synthesized by calcination of carbon cryogel containing tungsten in a form of metatungstate. Characterization by X-ray diffraction and transmission electron microscopy indicated core-shell structure of the particles with tungsten core and tungsten carbide shell, attached to graphitized carbon. Pt nanoparticles were deposited on this material and most of them were nucleated on tungsten carbide. Cyclic voltammetry of W-C support and Pt/W-C catalyst indicated hydrogen intercalation in surface hydrous tungsten oxide. Oxidation of COads on Pt/W-C commences earlier than on Pt/C for about 100 mV. The onset potentials of MOR on Pt/W-C and Pt/C are the same, but at more positive potentials Pt/W-C catalyst is more active. It was proposed that promotion of MOR is based on bifunctional mechanism that facilitates COads removal. Stability test was performed by potential cycling of Pt/W-C and Pt/C in the supporting electrolyte and in the presence of methanol. Pt surface area loss observed in the supporting electrolyte of both catalysts after 250 cycles was about 20%. Decrease in the activity for methanol oxidation was 30% for Pt/W-C, but even 48% for Pt/C. The difference was explained by the presence of hydrous tungsten oxide on Pt in Pt/W-C catalyst, which reduces accumulation of poisoning COads. Copyright
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - International Journal of Hydrogen Energy
T1  - Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation
VL  - 37
IS  - 14
SP  - 10671
EP  - 10679
DO  - 10.1016/j.ijhydene.2012.04.114
ER  - 

@article{
author = "Obradović, Maja and Babić, Biljana M. and Radmilović, Velimir R. and Krstajić, Nedeljko V. and Gojković, Snežana Lj.",
year = "2012",
abstract = "Tungsten carbide was synthesized by calcination of carbon cryogel containing tungsten in a form of metatungstate. Characterization by X-ray diffraction and transmission electron microscopy indicated core-shell structure of the particles with tungsten core and tungsten carbide shell, attached to graphitized carbon. Pt nanoparticles were deposited on this material and most of them were nucleated on tungsten carbide. Cyclic voltammetry of W-C support and Pt/W-C catalyst indicated hydrogen intercalation in surface hydrous tungsten oxide. Oxidation of COads on Pt/W-C commences earlier than on Pt/C for about 100 mV. The onset potentials of MOR on Pt/W-C and Pt/C are the same, but at more positive potentials Pt/W-C catalyst is more active. It was proposed that promotion of MOR is based on bifunctional mechanism that facilitates COads removal. Stability test was performed by potential cycling of Pt/W-C and Pt/C in the supporting electrolyte and in the presence of methanol. Pt surface area loss observed in the supporting electrolyte of both catalysts after 250 cycles was about 20%. Decrease in the activity for methanol oxidation was 30% for Pt/W-C, but even 48% for Pt/C. The difference was explained by the presence of hydrous tungsten oxide on Pt in Pt/W-C catalyst, which reduces accumulation of poisoning COads. Copyright",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "International Journal of Hydrogen Energy",
title = "Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation",
volume = "37",
number = "14",
pages = "10671-10679",
doi = "10.1016/j.ijhydene.2012.04.114"
}

Obradović, M., Babić, B. M., Radmilović, V. R., Krstajić, N. V.,& Gojković, S. Lj.. (2012). Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation. in International Journal of Hydrogen Energy
Oxford : Pergamon-Elsevier Science Ltd., 37(14), 10671-10679.
https://doi.org/10.1016/j.ijhydene.2012.04.114

Obradović M, Babić BM, Radmilović VR, Krstajić NV, Gojković SL. Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation. in International Journal of Hydrogen Energy. 2012;37(14):10671-10679.
doi:10.1016/j.ijhydene.2012.04.114 .

Obradović, Maja, Babić, Biljana M., Radmilović, Velimir R., Krstajić, Nedeljko V., Gojković, Snežana Lj., "Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation" in International Journal of Hydrogen Energy, 37, no. 14 (2012):10671-10679,
https://doi.org/10.1016/j.ijhydene.2012.04.114 . .

TY  - JOUR
AU  - Popov, Konstantin I.
AU  - Maksimović, Miodrag D.
AU  - Stevanović, Rade M.
AU  - Krstajić, Nedeljko V.
PY  - 1984
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4433
AB  - The effect of a pulsating current on the microthrowing power of metal deposits in the early stage of deposition was investigated by scanning electron microscopy. It is shown that at the same average current density the microthrowing power of metal deposits increases rapidly with increasing pause-to-pulse ratio.
PB  - Elsevier
T2  - Surface Technology
T1  - Fundamental aspects of pulsating current metal electrodeposition VIII: The effect of pause-to-pulse ratio on microthrowing power of metal deposition
VL  - 22
IS  - 2
SP  - 155
EP  - 158
DO  - 10.1016/0376-4583(84)90051-7
ER  - 

@article{
author = "Popov, Konstantin I. and Maksimović, Miodrag D. and Stevanović, Rade M. and Krstajić, Nedeljko V.",
year = "1984",
abstract = "The effect of a pulsating current on the microthrowing power of metal deposits in the early stage of deposition was investigated by scanning electron microscopy. It is shown that at the same average current density the microthrowing power of metal deposits increases rapidly with increasing pause-to-pulse ratio.",
publisher = "Elsevier",
journal = "Surface Technology",
title = "Fundamental aspects of pulsating current metal electrodeposition VIII: The effect of pause-to-pulse ratio on microthrowing power of metal deposition",
volume = "22",
number = "2",
pages = "155-158",
doi = "10.1016/0376-4583(84)90051-7"
}

Popov, K. I., Maksimović, M. D., Stevanović, R. M.,& Krstajić, N. V.. (1984). Fundamental aspects of pulsating current metal electrodeposition VIII: The effect of pause-to-pulse ratio on microthrowing power of metal deposition. in Surface Technology
Elsevier., 22(2), 155-158.
https://doi.org/10.1016/0376-4583(84)90051-7

Popov KI, Maksimović MD, Stevanović RM, Krstajić NV. Fundamental aspects of pulsating current metal electrodeposition VIII: The effect of pause-to-pulse ratio on microthrowing power of metal deposition. in Surface Technology. 1984;22(2):155-158.
doi:10.1016/0376-4583(84)90051-7 .

Popov, Konstantin I., Maksimović, Miodrag D., Stevanović, Rade M., Krstajić, Nedeljko V., "Fundamental aspects of pulsating current metal electrodeposition VIII: The effect of pause-to-pulse ratio on microthrowing power of metal deposition" in Surface Technology, 22, no. 2 (1984):155-158,
https://doi.org/10.1016/0376-4583(84)90051-7 . .

TY  - JOUR
AU  - Spasojević, Miroslav D.
AU  - Krstajić, Nedeljko V.
AU  - Despotov, P.
AU  - Atanasoski, Radoslav T.
AU  - Popov, Konstantin I.
PY  - 1984
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4452
AB  - It is shown that good quality deposits of cobalt-molybdenum alloys may be produced using pulse plating and it is demonstrated that such coatings on titanium have a low overpotential for hydrogen evolution under typical brine electrolysis conditions.
PB  - Switzerland : Springer Nature
T2  - Journal of Applied Electrochemistry
T1  - The evolution of hydrogen on cobalt-molybdenum coating: polarization characteristics
VL  - 14
IS  - 2
SP  - 265
EP  - 266
DO  - 10.1007/BF00618745
ER  - 

@article{
author = "Spasojević, Miroslav D. and Krstajić, Nedeljko V. and Despotov, P. and Atanasoski, Radoslav T. and Popov, Konstantin I.",
year = "1984",
abstract = "It is shown that good quality deposits of cobalt-molybdenum alloys may be produced using pulse plating and it is demonstrated that such coatings on titanium have a low overpotential for hydrogen evolution under typical brine electrolysis conditions.",
publisher = "Switzerland : Springer Nature",
journal = "Journal of Applied Electrochemistry",
title = "The evolution of hydrogen on cobalt-molybdenum coating: polarization characteristics",
volume = "14",
number = "2",
pages = "265-266",
doi = "10.1007/BF00618745"
}

Spasojević, M. D., Krstajić, N. V., Despotov, P., Atanasoski, R. T.,& Popov, K. I.. (1984). The evolution of hydrogen on cobalt-molybdenum coating: polarization characteristics. in Journal of Applied Electrochemistry
Switzerland : Springer Nature., 14(2), 265-266.
https://doi.org/10.1007/BF00618745

Spasojević MD, Krstajić NV, Despotov P, Atanasoski RT, Popov KI. The evolution of hydrogen on cobalt-molybdenum coating: polarization characteristics. in Journal of Applied Electrochemistry. 1984;14(2):265-266.
doi:10.1007/BF00618745 .

Spasojević, Miroslav D., Krstajić, Nedeljko V., Despotov, P., Atanasoski, Radoslav T., Popov, Konstantin I., "The evolution of hydrogen on cobalt-molybdenum coating: polarization characteristics" in Journal of Applied Electrochemistry, 14, no. 2 (1984):265-266,
https://doi.org/10.1007/BF00618745 . .

TY  - JOUR
AU  - Popov, Konstantin I.
AU  - Maksimović, Miodrag D.
AU  - Simičić, M.V.
AU  - Krstajić, Nedeljko V.
PY  - 1984
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4470
AB  - It is shown that spongy deposits are obtained under d.c. conditions and that compact deposits are obtained in pulsating current (PC) deposition with high pause-to-pulse ratios at the same average current density and deposition time. This is explained by an increased nucleation rate in PC deposition.
PB  - Elsevier
T2  - Surface Technology
T1  - Fundamental aspects of pulsating current metal electrodeposition IX: The prevention of spongy deposit formation on inert substrates
VL  - 22
IS  - 2
SP  - 159
EP  - 164
DO  - 10.1016/0376-4583(84)90052-9
ER  - 

@article{
author = "Popov, Konstantin I. and Maksimović, Miodrag D. and Simičić, M.V. and Krstajić, Nedeljko V.",
year = "1984",
abstract = "It is shown that spongy deposits are obtained under d.c. conditions and that compact deposits are obtained in pulsating current (PC) deposition with high pause-to-pulse ratios at the same average current density and deposition time. This is explained by an increased nucleation rate in PC deposition.",
publisher = "Elsevier",
journal = "Surface Technology",
title = "Fundamental aspects of pulsating current metal electrodeposition IX: The prevention of spongy deposit formation on inert substrates",
volume = "22",
number = "2",
pages = "159-164",
doi = "10.1016/0376-4583(84)90052-9"
}

Popov, K. I., Maksimović, M. D., Simičić, M.V.,& Krstajić, N. V.. (1984). Fundamental aspects of pulsating current metal electrodeposition IX: The prevention of spongy deposit formation on inert substrates. in Surface Technology
Elsevier., 22(2), 159-164.
https://doi.org/10.1016/0376-4583(84)90052-9

Popov KI, Maksimović MD, Simičić M, Krstajić NV. Fundamental aspects of pulsating current metal electrodeposition IX: The prevention of spongy deposit formation on inert substrates. in Surface Technology. 1984;22(2):159-164.
doi:10.1016/0376-4583(84)90052-9 .

Popov, Konstantin I., Maksimović, Miodrag D., Simičić, M.V., Krstajić, Nedeljko V., "Fundamental aspects of pulsating current metal electrodeposition IX: The prevention of spongy deposit formation on inert substrates" in Surface Technology, 22, no. 2 (1984):159-164,
https://doi.org/10.1016/0376-4583(84)90052-9 . .

TY  - JOUR
AU  - Krstajić, Nedeljko V.
AU  - Spasojević, Miroslav D.
AU  - Atanasoski, Radoslav T.
PY  - 1984
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4451
AB  - There is practical interest in the use of titanium as a cathode material in brine electrolysis processes. The overvoltage of hydrogen evolution on titanium is, however, very high and, at the same time, hydrogen penetrates the bulk of the metal. Here, a new type of catalytically active coating has been applied on the surface of titanium in order to overcome these problems. The coating consists of a mixture of the thermal decomposition products of lanthanum chloride and sodium molybdate. The coating has been tested for 18 months of continuous operation. No change in the overvoltage gain (of 0.4 V at 3 kA m-2, as compared with pure titanium) nor change in the properties of the bulk metal have been noticed during this period.
PB  - Switzerland : Springer Nature
T2  - Journal of Applied Electrochemistry
T1  - Lanthanum-molybdenum coating for hydrogen evolution on titanium
VL  - 19
VL  - 14
IS  - 11
IS  - 1
DO  - 10.1007/BF00611270
ER  - 

@article{
author = "Krstajić, Nedeljko V. and Spasojević, Miroslav D. and Atanasoski, Radoslav T.",
year = "1984",
abstract = "There is practical interest in the use of titanium as a cathode material in brine electrolysis processes. The overvoltage of hydrogen evolution on titanium is, however, very high and, at the same time, hydrogen penetrates the bulk of the metal. Here, a new type of catalytically active coating has been applied on the surface of titanium in order to overcome these problems. The coating consists of a mixture of the thermal decomposition products of lanthanum chloride and sodium molybdate. The coating has been tested for 18 months of continuous operation. No change in the overvoltage gain (of 0.4 V at 3 kA m-2, as compared with pure titanium) nor change in the properties of the bulk metal have been noticed during this period.",
publisher = "Switzerland : Springer Nature",
journal = "Journal of Applied Electrochemistry",
title = "Lanthanum-molybdenum coating for hydrogen evolution on titanium",
volume = "19, 14",
number = "11, 1",
doi = "10.1007/BF00611270"
}

Krstajić, N. V., Spasojević, M. D.,& Atanasoski, R. T.. (1984). Lanthanum-molybdenum coating for hydrogen evolution on titanium. in Journal of Applied Electrochemistry
Switzerland : Springer Nature., 19(11).
https://doi.org/10.1007/BF00611270

Krstajić NV, Spasojević MD, Atanasoski RT. Lanthanum-molybdenum coating for hydrogen evolution on titanium. in Journal of Applied Electrochemistry. 1984;19(11).
doi:10.1007/BF00611270 .

Krstajić, Nedeljko V., Spasojević, Miroslav D., Atanasoski, Radoslav T., "Lanthanum-molybdenum coating for hydrogen evolution on titanium" in Journal of Applied Electrochemistry, 19, no. 11 (1984),
https://doi.org/10.1007/BF00611270 . .

TY  - JOUR
AU  - Spasojević, Miroslav D.
AU  - Krstajić, Nedeljko V.
AU  - Jakšić, Milan M.
PY  - 1984
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4434
AB  - It has been shown that while the mixed RuO2TiO2 coated titanium anode deteriorates very quickly in the presence of ionic phosphate species, the electrode containing palladium and tin oxides in the coating mixture as well as the former catalyst exhibits almost equal electrocatalytic activity and a high corrosion stability in both dichromate and phosphate buffering systems. Electrocatalytic optimization of faradaic yields over a much wider pH range for the chlorate cell process has been achieved by the mixed ruthenium, palladium, tin and titanium oxide catalysts and in the presence of a phosphate buffer. The effect is tentatively ascribed to the phosphate adsorption associated with further activation polarization (inhibition effect) of the available chlorine oxidation reaction at the anode. Two benefits result therefrom: (a) the pH value can be kept at around pH 7, providing better elemental chlorine absorption, and (b) dichromate buffer can be at least partially replaced by the more convinient phosphate buffering system.
PB  - Elsevier
T2  - Surface Technology
T1  - Electrocatalytic optimization of faradaic yields in the chlorate cell process
VL  - 21
IS  - 1
SP  - 19
EP  - 26
DO  - 10.1016/0376-4583(84)90144-4
ER  - 

@article{
author = "Spasojević, Miroslav D. and Krstajić, Nedeljko V. and Jakšić, Milan M.",
year = "1984",
abstract = "It has been shown that while the mixed RuO2TiO2 coated titanium anode deteriorates very quickly in the presence of ionic phosphate species, the electrode containing palladium and tin oxides in the coating mixture as well as the former catalyst exhibits almost equal electrocatalytic activity and a high corrosion stability in both dichromate and phosphate buffering systems. Electrocatalytic optimization of faradaic yields over a much wider pH range for the chlorate cell process has been achieved by the mixed ruthenium, palladium, tin and titanium oxide catalysts and in the presence of a phosphate buffer. The effect is tentatively ascribed to the phosphate adsorption associated with further activation polarization (inhibition effect) of the available chlorine oxidation reaction at the anode. Two benefits result therefrom: (a) the pH value can be kept at around pH 7, providing better elemental chlorine absorption, and (b) dichromate buffer can be at least partially replaced by the more convinient phosphate buffering system.",
publisher = "Elsevier",
journal = "Surface Technology",
title = "Electrocatalytic optimization of faradaic yields in the chlorate cell process",
volume = "21",
number = "1",
pages = "19-26",
doi = "10.1016/0376-4583(84)90144-4"
}

Spasojević, M. D., Krstajić, N. V.,& Jakšić, M. M.. (1984). Electrocatalytic optimization of faradaic yields in the chlorate cell process. in Surface Technology
Elsevier., 21(1), 19-26.
https://doi.org/10.1016/0376-4583(84)90144-4

Spasojević MD, Krstajić NV, Jakšić MM. Electrocatalytic optimization of faradaic yields in the chlorate cell process. in Surface Technology. 1984;21(1):19-26.
doi:10.1016/0376-4583(84)90144-4 .

Spasojević, Miroslav D., Krstajić, Nedeljko V., Jakšić, Milan M., "Electrocatalytic optimization of faradaic yields in the chlorate cell process" in Surface Technology, 21, no. 1 (1984):19-26,
https://doi.org/10.1016/0376-4583(84)90144-4 . .

TY  - JOUR
AU  - Popov, Konstantin I.
AU  - Krstajić, Nedeljko V.
AU  - Popov, Svetlana R.
PY  - 1983
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4417
AB  - It is shown that the optimum plating overpotential or the optimum current density is determined by the upper limit of validity of the Tafel relationship for the deposition process.
PB  - Elsevier
T2  - Surface Technology
T1  - Fundamental aspects of plating technology I: The determination of the optimum deposition current density
VL  - 20
IS  - 3
SP  - 199
EP  - 202
DO  - 10.1016/0376-4583(83)90003-1
ER  - 

@article{
author = "Popov, Konstantin I. and Krstajić, Nedeljko V. and Popov, Svetlana R.",
year = "1983",
abstract = "It is shown that the optimum plating overpotential or the optimum current density is determined by the upper limit of validity of the Tafel relationship for the deposition process.",
publisher = "Elsevier",
journal = "Surface Technology",
title = "Fundamental aspects of plating technology I: The determination of the optimum deposition current density",
volume = "20",
number = "3",
pages = "199-202",
doi = "10.1016/0376-4583(83)90003-1"
}

Popov, K. I., Krstajić, N. V.,& Popov, S. R.. (1983). Fundamental aspects of plating technology I: The determination of the optimum deposition current density. in Surface Technology
Elsevier., 20(3), 199-202.
https://doi.org/10.1016/0376-4583(83)90003-1

Popov KI, Krstajić NV, Popov SR. Fundamental aspects of plating technology I: The determination of the optimum deposition current density. in Surface Technology. 1983;20(3):199-202.
doi:10.1016/0376-4583(83)90003-1 .

Popov, Konstantin I., Krstajić, Nedeljko V., Popov, Svetlana R., "Fundamental aspects of plating technology I: The determination of the optimum deposition current density" in Surface Technology, 20, no. 3 (1983):199-202,
https://doi.org/10.1016/0376-4583(83)90003-1 . .

TY  - JOUR
AU  - Popov, Konstantin I.
AU  - Krstajić, Nedeljko V.
AU  - Popov, Svetlana R.
PY  - 1983
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4419
AB  - It is shown that the improved quality of electrodeposits obtained from ammonium complex salt solutions compared with deposits obtained from simple salt solutions is due to the decrease in the exchange current density value for the deposition process.
PB  - Elsevier
T2  - Surface Technology
T1  - Fundamental aspects of plating technology II: Morphological aspects of metal electrodeposition from complex salt solutions
VL  - 20
IS  - 3
SP  - 203
EP  - 208
DO  - 10.1016/0376-4583(83)90004-3
ER  - 

@article{
author = "Popov, Konstantin I. and Krstajić, Nedeljko V. and Popov, Svetlana R.",
year = "1983",
abstract = "It is shown that the improved quality of electrodeposits obtained from ammonium complex salt solutions compared with deposits obtained from simple salt solutions is due to the decrease in the exchange current density value for the deposition process.",
publisher = "Elsevier",
journal = "Surface Technology",
title = "Fundamental aspects of plating technology II: Morphological aspects of metal electrodeposition from complex salt solutions",
volume = "20",
number = "3",
pages = "203-208",
doi = "10.1016/0376-4583(83)90004-3"
}

Popov, K. I., Krstajić, N. V.,& Popov, S. R.. (1983). Fundamental aspects of plating technology II: Morphological aspects of metal electrodeposition from complex salt solutions. in Surface Technology
Elsevier., 20(3), 203-208.
https://doi.org/10.1016/0376-4583(83)90004-3

Popov KI, Krstajić NV, Popov SR. Fundamental aspects of plating technology II: Morphological aspects of metal electrodeposition from complex salt solutions. in Surface Technology. 1983;20(3):203-208.
doi:10.1016/0376-4583(83)90004-3 .

Popov, Konstantin I., Krstajić, Nedeljko V., Popov, Svetlana R., "Fundamental aspects of plating technology II: Morphological aspects of metal electrodeposition from complex salt solutions" in Surface Technology, 20, no. 3 (1983):203-208,
https://doi.org/10.1016/0376-4583(83)90004-3 . .