Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support
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2011
Authors
Vukovic, Goran D.Obradović, Maja

Marinković, Aleksandar D.

Rogan, Jelena R.

Uskoković, Petar S.

Radmilović, Velimir R.

Gojković, Snežana Lj.

Article (Published version)

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Multi-walled carbon nanotubes (MWCNTs) were used as a support for Pt nanoparticles prepared by the microwave-assisted polyol method. The MWCNTs were pretreated by chemical oxidation (o-MWCNTs) followed by modification by ethylenediamine (eda-MWCNTs). Characterization of both oxidized and eda-modified materials by UV-spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy revealed that the modification by eda leads to (i) agglomeration of the MWCNTs, (ii) a decrease in the capacitance of the material and (iii) reduced rate of electron transfer between the MWCNTs and solution species. However, the Pt loading of Pt/o-MWCNTs was only 2 mass% while the loading of Pt/eda-MWCNTs was 20 mass%. Much higher efficiency of Pt deposition on eda-MWCNTs than on o-MWCNTs was ascribed to the shift in pH(pzc) value of the MWCNT surface from 2.43 to 5.91 upon modification by eda. Transmission electron microscopy revealed that the mean diameter of the Pt particles in Pt/eda-MWCNTs is 2....5 +/- 0.5 nm and that their distribution on the support is homogenous with no evidence of pronounced particle agglomeration. Cyclic voltammetry of a Pt/eda-MWCNT thin film indicated a clean Pt surface with well-resolved peaks characteristic of polycrystalline Pt. Its electrocatalytic activity for oxygen reduction was examined and the results corresponded to the commercial Pt nanocatalyst. This study shows that modification of o-MWCNTs by eda helps to achieve homogenous distribution of small Pt nanoparticles and does not impede its electrocatalytic activity.
Keywords:
Nanostructures / Electrochemical properties / DTA / TEMSource:
Materials Chemistry and Physics, 2011, 130, 1-2, 657-664Publisher:
- Elsevier Science Sa, Lausanne
Funding / projects:
- Development, characterization and application nanostructured and composite electrocatalysts and interactive supports for fuel cells and water electrolysis (RS-172054)
- Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-45019)
- Reinforcing of Nanotechnology and Functional Materials Centre (EU-245916)
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering - DE-AC02-05CH11231
DOI: 10.1016/j.matchemphys.2011.07.046
ISSN: 0254-0584
WoS: 000295601700104
Scopus: 2-s2.0-80052575240
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IHTMTY - JOUR AU - Vukovic, Goran D. AU - Obradović, Maja AU - Marinković, Aleksandar D. AU - Rogan, Jelena R. AU - Uskoković, Petar S. AU - Radmilović, Velimir R. AU - Gojković, Snežana Lj. PY - 2011 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/801 AB - Multi-walled carbon nanotubes (MWCNTs) were used as a support for Pt nanoparticles prepared by the microwave-assisted polyol method. The MWCNTs were pretreated by chemical oxidation (o-MWCNTs) followed by modification by ethylenediamine (eda-MWCNTs). Characterization of both oxidized and eda-modified materials by UV-spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy revealed that the modification by eda leads to (i) agglomeration of the MWCNTs, (ii) a decrease in the capacitance of the material and (iii) reduced rate of electron transfer between the MWCNTs and solution species. However, the Pt loading of Pt/o-MWCNTs was only 2 mass% while the loading of Pt/eda-MWCNTs was 20 mass%. Much higher efficiency of Pt deposition on eda-MWCNTs than on o-MWCNTs was ascribed to the shift in pH(pzc) value of the MWCNT surface from 2.43 to 5.91 upon modification by eda. Transmission electron microscopy revealed that the mean diameter of the Pt particles in Pt/eda-MWCNTs is 2.5 +/- 0.5 nm and that their distribution on the support is homogenous with no evidence of pronounced particle agglomeration. Cyclic voltammetry of a Pt/eda-MWCNT thin film indicated a clean Pt surface with well-resolved peaks characteristic of polycrystalline Pt. Its electrocatalytic activity for oxygen reduction was examined and the results corresponded to the commercial Pt nanocatalyst. This study shows that modification of o-MWCNTs by eda helps to achieve homogenous distribution of small Pt nanoparticles and does not impede its electrocatalytic activity. PB - Elsevier Science Sa, Lausanne T2 - Materials Chemistry and Physics T1 - Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support VL - 130 IS - 1-2 SP - 657 EP - 664 DO - 10.1016/j.matchemphys.2011.07.046 ER -
@article{ author = "Vukovic, Goran D. and Obradović, Maja and Marinković, Aleksandar D. and Rogan, Jelena R. and Uskoković, Petar S. and Radmilović, Velimir R. and Gojković, Snežana Lj.", year = "2011", abstract = "Multi-walled carbon nanotubes (MWCNTs) were used as a support for Pt nanoparticles prepared by the microwave-assisted polyol method. The MWCNTs were pretreated by chemical oxidation (o-MWCNTs) followed by modification by ethylenediamine (eda-MWCNTs). Characterization of both oxidized and eda-modified materials by UV-spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy revealed that the modification by eda leads to (i) agglomeration of the MWCNTs, (ii) a decrease in the capacitance of the material and (iii) reduced rate of electron transfer between the MWCNTs and solution species. However, the Pt loading of Pt/o-MWCNTs was only 2 mass% while the loading of Pt/eda-MWCNTs was 20 mass%. Much higher efficiency of Pt deposition on eda-MWCNTs than on o-MWCNTs was ascribed to the shift in pH(pzc) value of the MWCNT surface from 2.43 to 5.91 upon modification by eda. Transmission electron microscopy revealed that the mean diameter of the Pt particles in Pt/eda-MWCNTs is 2.5 +/- 0.5 nm and that their distribution on the support is homogenous with no evidence of pronounced particle agglomeration. Cyclic voltammetry of a Pt/eda-MWCNT thin film indicated a clean Pt surface with well-resolved peaks characteristic of polycrystalline Pt. Its electrocatalytic activity for oxygen reduction was examined and the results corresponded to the commercial Pt nanocatalyst. This study shows that modification of o-MWCNTs by eda helps to achieve homogenous distribution of small Pt nanoparticles and does not impede its electrocatalytic activity.", publisher = "Elsevier Science Sa, Lausanne", journal = "Materials Chemistry and Physics", title = "Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support", volume = "130", number = "1-2", pages = "657-664", doi = "10.1016/j.matchemphys.2011.07.046" }
Vukovic, G. D., Obradović, M., Marinković, A. D., Rogan, J. R., Uskoković, P. S., Radmilović, V. R.,& Gojković, S. Lj.. (2011). Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support. in Materials Chemistry and Physics Elsevier Science Sa, Lausanne., 130(1-2), 657-664. https://doi.org/10.1016/j.matchemphys.2011.07.046
Vukovic GD, Obradović M, Marinković AD, Rogan JR, Uskoković PS, Radmilović VR, Gojković SL. Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support. in Materials Chemistry and Physics. 2011;130(1-2):657-664. doi:10.1016/j.matchemphys.2011.07.046 .
Vukovic, Goran D., Obradović, Maja, Marinković, Aleksandar D., Rogan, Jelena R., Uskoković, Petar S., Radmilović, Velimir R., Gojković, Snežana Lj., "Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support" in Materials Chemistry and Physics, 130, no. 1-2 (2011):657-664, https://doi.org/10.1016/j.matchemphys.2011.07.046 . .