TY  - JOUR
AU  - Terzić, Sanja
AU  - Jovanović, Vladislava M.
AU  - Tripković, Dušan
AU  - Kowal, Andrzej
AU  - Stoch, Jerzy
PY  - 2007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/329
AB  - The effect of the electrochemical oxidation of glassy carbon on the deposition of platinum particles and the electrocatalytic activity of platinum supported on oxidized glassy carbon were studied for methanol oxidation in H2SO4 solution. Platinum was potentiostatically deposited from H2SO4 + 6mM H2PtCl6 solution. Glassy carbon was anodically polarized in 1 M NaOH at 1.41 V (SCE) for 35 and 95 s and in 0.5 M H2SO4 at 2V (SCE) for 35; 95 s and 2.25 V for 35 and 95 s. Electrochemical treatment of the GC support leads to a better distribution of platinum on the substrate and has remarkable effect on the activity. The activity of the Pt/GCox electrode for methanol oxidation is larger than that of polycrystalline Pt and by more than one order of magnitude larger than that of a Pt/GC electrode. This increase in activity indicates the pronounced role of the organic residues of the GC support on the properties of Pt particles deposited on glassy carbon.
AB  - Katalizatori dobijeni nanošenjem platine na karbon razvijene površine ispituju se već duži niz godina zbog njihove potencijalne primene u gorivim spregovima. Efekat elektrohemijske oksidacije staklastog ugljenika na depoziciju platinskih čestica i elektrokatalitičku aktivnost platine deponovane na oksidovani staklasti ugljenik je ispitivan za reakciju oksidacije metanola u H2SO4 i NaOH rastvoru. Platina je deponovana potenciostatskom pulsnom metodom iz 0,5M H2SO4+6mM H2PtCl6, rastvora. Staklasti ugljenik je anodno polarizovan u alkalnoj sredini (1 M NaOH na 1,41V (ZKE) u toku 35 i 95s) i kiseloj sredini (0,5M H2SO4 na 2 V (ZKE) u toku 35; 95s i 2,25V u toku 35 i 95 s). Elektrohemijski tretman GC podloge vodi ka boljoj distribuciji platine i pokazuje značajno veliki uticaj na aktivnost. Aktivnost GCox/Pt elektrode anodno oksidovane pri 2,25 V u toku 35 s je veća odpolikristalne platine a za red veličine veća od GC/Pt elektrode. Povećanje aktivnosti posledica je izraženog uticaja organskih vrsta na GC podlozi na osobine platinskih čestica deponovanih na staklasti ugljenik.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Electrochemical and microstructural characterization of platinum supported on glassy carbon
T1  - Elektrohemijska, mikroskopska i spektroskopska karakterizacija platine nataložene na staklasti ugljenik
VL  - 61
IS  - 3
SP  - 135
EP  - 141
DO  - 10.2298/HEMIND0703135T
ER  - 

@article{
author = "Terzić, Sanja and Jovanović, Vladislava M. and Tripković, Dušan and Kowal, Andrzej and Stoch, Jerzy",
year = "2007",
abstract = "The effect of the electrochemical oxidation of glassy carbon on the deposition of platinum particles and the electrocatalytic activity of platinum supported on oxidized glassy carbon were studied for methanol oxidation in H2SO4 solution. Platinum was potentiostatically deposited from H2SO4 + 6mM H2PtCl6 solution. Glassy carbon was anodically polarized in 1 M NaOH at 1.41 V (SCE) for 35 and 95 s and in 0.5 M H2SO4 at 2V (SCE) for 35; 95 s and 2.25 V for 35 and 95 s. Electrochemical treatment of the GC support leads to a better distribution of platinum on the substrate and has remarkable effect on the activity. The activity of the Pt/GCox electrode for methanol oxidation is larger than that of polycrystalline Pt and by more than one order of magnitude larger than that of a Pt/GC electrode. This increase in activity indicates the pronounced role of the organic residues of the GC support on the properties of Pt particles deposited on glassy carbon., Katalizatori dobijeni nanošenjem platine na karbon razvijene površine ispituju se već duži niz godina zbog njihove potencijalne primene u gorivim spregovima. Efekat elektrohemijske oksidacije staklastog ugljenika na depoziciju platinskih čestica i elektrokatalitičku aktivnost platine deponovane na oksidovani staklasti ugljenik je ispitivan za reakciju oksidacije metanola u H2SO4 i NaOH rastvoru. Platina je deponovana potenciostatskom pulsnom metodom iz 0,5M H2SO4+6mM H2PtCl6, rastvora. Staklasti ugljenik je anodno polarizovan u alkalnoj sredini (1 M NaOH na 1,41V (ZKE) u toku 35 i 95s) i kiseloj sredini (0,5M H2SO4 na 2 V (ZKE) u toku 35; 95s i 2,25V u toku 35 i 95 s). Elektrohemijski tretman GC podloge vodi ka boljoj distribuciji platine i pokazuje značajno veliki uticaj na aktivnost. Aktivnost GCox/Pt elektrode anodno oksidovane pri 2,25 V u toku 35 s je veća odpolikristalne platine a za red veličine veća od GC/Pt elektrode. Povećanje aktivnosti posledica je izraženog uticaja organskih vrsta na GC podlozi na osobine platinskih čestica deponovanih na staklasti ugljenik.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Electrochemical and microstructural characterization of platinum supported on glassy carbon, Elektrohemijska, mikroskopska i spektroskopska karakterizacija platine nataložene na staklasti ugljenik",
volume = "61",
number = "3",
pages = "135-141",
doi = "10.2298/HEMIND0703135T"
}

Terzić, S., Jovanović, V. M., Tripković, D., Kowal, A.,& Stoch, J.. (2007). Electrochemical and microstructural characterization of platinum supported on glassy carbon. in Hemijska industrija
Association of Chemical Engineers of Serbia., 61(3), 135-141.
https://doi.org/10.2298/HEMIND0703135T

Terzić S, Jovanović VM, Tripković D, Kowal A, Stoch J. Electrochemical and microstructural characterization of platinum supported on glassy carbon. in Hemijska industrija. 2007;61(3):135-141.
doi:10.2298/HEMIND0703135T .

Terzić, Sanja, Jovanović, Vladislava M., Tripković, Dušan, Kowal, Andrzej, Stoch, Jerzy, "Electrochemical and microstructural characterization of platinum supported on glassy carbon" in Hemijska industrija, 61, no. 3 (2007):135-141,
https://doi.org/10.2298/HEMIND0703135T . .

TY  - JOUR
AU  - Jovanović, Vladislava M.
AU  - Tripković, Dušan
AU  - Tripković, Amalija
AU  - Kowal, Andrzej
AU  - Stoch, Jerzy
PY  - 2005
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/185
AB  - Formic acid oxidation at platinum electrochemically deposited on polished (GC/Pt) and oxidized glassy carbon (GC(ox)/Pt) was examined with the objective of studying the effect of electrochemical treatment of the support on deposition of platinum and on the activity of Pt catalyst. The electrodes were characterised by STM and XPS techniques. The oxidative treatment of the support leads to deposition of smaller Pt particles in comparison with the one on the polished substrate. The XPS spectra indicated the increased fraction of functional (acidic) groups on the treated support as well as the higher fraction of oxygen containing species on Pt catalyst deposited on oxidised referring to Pt deposited on polished substrate. The activity of GC(ox)/Pt electrode is increased by the factor of 2-4 for formic acid oxidation compared to the activity of GC/Pt electrode. This result is explained by the oxidative removal Of COad species leading to enhanced amount of Pt free sites available for direct formic acid oxidation to CO2.
PB  - Elsevier
T2  - Electrochemistry Communications
T1  - Oxidation of formic acid on platinum electrodeposited on polished and oxidized glassy carbon
VL  - 7
IS  - 10
SP  - 1039
EP  - 1044
DO  - 10.1016/j.elecom.2005.07.009
ER  - 

@article{
author = "Jovanović, Vladislava M. and Tripković, Dušan and Tripković, Amalija and Kowal, Andrzej and Stoch, Jerzy",
year = "2005",
abstract = "Formic acid oxidation at platinum electrochemically deposited on polished (GC/Pt) and oxidized glassy carbon (GC(ox)/Pt) was examined with the objective of studying the effect of electrochemical treatment of the support on deposition of platinum and on the activity of Pt catalyst. The electrodes were characterised by STM and XPS techniques. The oxidative treatment of the support leads to deposition of smaller Pt particles in comparison with the one on the polished substrate. The XPS spectra indicated the increased fraction of functional (acidic) groups on the treated support as well as the higher fraction of oxygen containing species on Pt catalyst deposited on oxidised referring to Pt deposited on polished substrate. The activity of GC(ox)/Pt electrode is increased by the factor of 2-4 for formic acid oxidation compared to the activity of GC/Pt electrode. This result is explained by the oxidative removal Of COad species leading to enhanced amount of Pt free sites available for direct formic acid oxidation to CO2.",
publisher = "Elsevier",
journal = "Electrochemistry Communications",
title = "Oxidation of formic acid on platinum electrodeposited on polished and oxidized glassy carbon",
volume = "7",
number = "10",
pages = "1039-1044",
doi = "10.1016/j.elecom.2005.07.009"
}

Jovanović, V. M., Tripković, D., Tripković, A., Kowal, A.,& Stoch, J.. (2005). Oxidation of formic acid on platinum electrodeposited on polished and oxidized glassy carbon. in Electrochemistry Communications
Elsevier., 7(10), 1039-1044.
https://doi.org/10.1016/j.elecom.2005.07.009

Jovanović VM, Tripković D, Tripković A, Kowal A, Stoch J. Oxidation of formic acid on platinum electrodeposited on polished and oxidized glassy carbon. in Electrochemistry Communications. 2005;7(10):1039-1044.
doi:10.1016/j.elecom.2005.07.009 .

Jovanović, Vladislava M., Tripković, Dušan, Tripković, Amalija, Kowal, Andrzej, Stoch, Jerzy, "Oxidation of formic acid on platinum electrodeposited on polished and oxidized glassy carbon" in Electrochemistry Communications, 7, no. 10 (2005):1039-1044,
https://doi.org/10.1016/j.elecom.2005.07.009 . .

TY  - JOUR
AU  - Obradović, Maja
AU  - Stevanović, Jasmina
AU  - Despić, Aleksandar R.
AU  - Stevanović, Rade M.
AU  - Stoch, Jerzy
PY  - 2001
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/29
AB  - Ni-W alloys electrodeposited from citrate solution consist of three different phases, which are all present in high W-content alloys: a solid solution of W in a Ni matrix; an intermetallic compound Ni4W, as well as another solid solution of W in Ni with a W content higher than 20 mol. %. XPS analysis revealed that the alloys were covered with a surface layer of complex structure containing the pure metals Ni and W, Ni(OH)2 andWO3, on the very surface as well as some partially reduced oxideWO2.72 (most probably a solid solution ofWO2.72 in Ni) and tungsten carbide in the layer underneath. It is highly likely that some of the oxide species in the layer act as intermediates in the cathodic deposition process. Identifying these species should be the clue to a more detailed understanding of the mechanism of induced deposition of W than has been achieved so far. Corrosion of Ni-W alloys in sulfuric acid solution at OCP, occurs by the preferential dissolution of nickel from the surface layer. The longer the corrosion process lasts, the more the surface behaves like pure W. The lowest initial corrosion rates were recorded with alloys rich in W, but after aging at OCP the lowest corrosion c.d. was found for the Ni-W alloy with the most homogenous phase structure, consisting of the solid solution only.
AB  - Elektrohemijski taložene legure Ni-W iz citratnog rastvora sadrže tri različite faze, koje su prisutne pri visokom sadržaju W u leguri: čvrst rastvor W u Ni; intermetalno jedinjenje Ni4Wi čvrst rastvor Wu Ni sa sadržajem W većim od 20 mol %. XPS analizom je pokazano da su legure pokrivene slojem složene strukture. Ovaj sloj sadrži čiste metale Ni i W, Ni(OH)2 i WO3, na samoj površini. U sloju ispod same površine nađeni su i delimično redukovan oksid WO2,72 (najverovatnije čvrst rastvor WO2,72 u Ni) i volfram-karbid. Vrlo je verovatno da neka od oksidnih vrsta u sloju učestvuje kao intermedijer u procesu katodnog taloženja. Identifikacija te vrste mogla bi doprineti boljem razumevanju mehanizma indukovanog taloženja volframa. Na potencijalu otvorenog kola u sumpornoj kiselini korozioni proces se odigrava tako što se preferencijalno rastvara Ni iz površinskog sloja legure. Ukoliko korozioni proces traje duže utoliko korozione karakteristike postaju sve sličnije onima za čist W. Niže početne brzine korozije dobijene su za legure sa većim sadržajem W. Međutim, nakon stajanja na potencijalu otvorenog kola niže korozione struje su dobijene za Ni-W leguru homogene fazne strukture koja sadrži samo čvrst rastvor.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Characterization and corrosion properties of electrodeposited Ni-W alloys
T1  - Karakterizacija i korozione karakteristike elektrohemijski taložene legure Ni-W
VL  - 66
IS  - 11-12
SP  - 899
EP  - 912
DO  - 10.2298/jsc0112899o
UR  - https://hdl.handle.net/21.15107/rcub_cer_29
ER  - 

@article{
author = "Obradović, Maja and Stevanović, Jasmina and Despić, Aleksandar R. and Stevanović, Rade M. and Stoch, Jerzy",
year = "2001",
abstract = "Ni-W alloys electrodeposited from citrate solution consist of three different phases, which are all present in high W-content alloys: a solid solution of W in a Ni matrix; an intermetallic compound Ni4W, as well as another solid solution of W in Ni with a W content higher than 20 mol. %. XPS analysis revealed that the alloys were covered with a surface layer of complex structure containing the pure metals Ni and W, Ni(OH)2 andWO3, on the very surface as well as some partially reduced oxideWO2.72 (most probably a solid solution ofWO2.72 in Ni) and tungsten carbide in the layer underneath. It is highly likely that some of the oxide species in the layer act as intermediates in the cathodic deposition process. Identifying these species should be the clue to a more detailed understanding of the mechanism of induced deposition of W than has been achieved so far. Corrosion of Ni-W alloys in sulfuric acid solution at OCP, occurs by the preferential dissolution of nickel from the surface layer. The longer the corrosion process lasts, the more the surface behaves like pure W. The lowest initial corrosion rates were recorded with alloys rich in W, but after aging at OCP the lowest corrosion c.d. was found for the Ni-W alloy with the most homogenous phase structure, consisting of the solid solution only., Elektrohemijski taložene legure Ni-W iz citratnog rastvora sadrže tri različite faze, koje su prisutne pri visokom sadržaju W u leguri: čvrst rastvor W u Ni; intermetalno jedinjenje Ni4Wi čvrst rastvor Wu Ni sa sadržajem W većim od 20 mol %. XPS analizom je pokazano da su legure pokrivene slojem složene strukture. Ovaj sloj sadrži čiste metale Ni i W, Ni(OH)2 i WO3, na samoj površini. U sloju ispod same površine nađeni su i delimično redukovan oksid WO2,72 (najverovatnije čvrst rastvor WO2,72 u Ni) i volfram-karbid. Vrlo je verovatno da neka od oksidnih vrsta u sloju učestvuje kao intermedijer u procesu katodnog taloženja. Identifikacija te vrste mogla bi doprineti boljem razumevanju mehanizma indukovanog taloženja volframa. Na potencijalu otvorenog kola u sumpornoj kiselini korozioni proces se odigrava tako što se preferencijalno rastvara Ni iz površinskog sloja legure. Ukoliko korozioni proces traje duže utoliko korozione karakteristike postaju sve sličnije onima za čist W. Niže početne brzine korozije dobijene su za legure sa većim sadržajem W. Međutim, nakon stajanja na potencijalu otvorenog kola niže korozione struje su dobijene za Ni-W leguru homogene fazne strukture koja sadrži samo čvrst rastvor.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Characterization and corrosion properties of electrodeposited Ni-W alloys, Karakterizacija i korozione karakteristike elektrohemijski taložene legure Ni-W",
volume = "66",
number = "11-12",
pages = "899-912",
doi = "10.2298/jsc0112899o",
url = "https://hdl.handle.net/21.15107/rcub_cer_29"
}

Obradović, M., Stevanović, J., Despić, A. R., Stevanović, R. M.,& Stoch, J.. (2001). Characterization and corrosion properties of electrodeposited Ni-W alloys. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 66(11-12), 899-912.
https://doi.org/10.2298/jsc0112899o
https://hdl.handle.net/21.15107/rcub_cer_29

Obradović M, Stevanović J, Despić AR, Stevanović RM, Stoch J. Characterization and corrosion properties of electrodeposited Ni-W alloys. in Journal of the Serbian Chemical Society. 2001;66(11-12):899-912.
doi:10.2298/jsc0112899o
https://hdl.handle.net/21.15107/rcub_cer_29 .

Obradović, Maja, Stevanović, Jasmina, Despić, Aleksandar R., Stevanović, Rade M., Stoch, Jerzy, "Characterization and corrosion properties of electrodeposited Ni-W alloys" in Journal of the Serbian Chemical Society, 66, no. 11-12 (2001):899-912,
https://doi.org/10.2298/jsc0112899o .,
https://hdl.handle.net/21.15107/rcub_cer_29 .