Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods
Abstract
Electrodes, assigned as GC/Pt-C and GC/Pt-Ru-C, were formed by deposition of Pt-based catalysts (47.5 wt % Pt + high surface area carbon) and (54 wt. % Pt-Ru alloy + high surface area carbon) on glassy carbon (GC) discs. X-ray diffraction measurements were used for the determination of the average crystallite size and phase composition of both catalysts. Crystallite size for Pt-C catalyst was 2.9 nm for Pt-fcc. In the diffraction pattern of the Pt-Ru-C catalyst two phases, e.g. Pt-Ru-fcc and Ru-hcp were refined using the Rietveld method. Crystallite sizes were 3.9 nm for Pt-Ru-fcc and 2.8 nm for Ru-hcp. STM observations of the surface of GC/Pt-C and GC/Pt-Ru-C electrodes revealed the presence of metal particles of the size in the range 2-6 nm and Pt-C or PtRu-C agglomerates in the range of several tenth of nm. The thickness of the Nafion covering layer determined by AFM is ca. 100 nm. A simplified scheme of the investigated electrodes was created.
Keywords:
AFM / Glassy carbon / Pt catalyst / Pt-Ru catalyst / STM / XRDSource:
Materials Science Forum, 2006, 518, 271-276
DOI: 10.4028/www.scientific.net/MSF.518.271
ISSN: 0255-5476
WoS: 000239351800045
Scopus: 2-s2.0-37849022051
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Institution/Community
IHTMTY - CONF AU - Kowal, Andrzej AU - Olszewski, Piotr K. AU - Tripković, Dušan AU - Stevanović, Rade M. PY - 2006 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/281 AB - Electrodes, assigned as GC/Pt-C and GC/Pt-Ru-C, were formed by deposition of Pt-based catalysts (47.5 wt % Pt + high surface area carbon) and (54 wt. % Pt-Ru alloy + high surface area carbon) on glassy carbon (GC) discs. X-ray diffraction measurements were used for the determination of the average crystallite size and phase composition of both catalysts. Crystallite size for Pt-C catalyst was 2.9 nm for Pt-fcc. In the diffraction pattern of the Pt-Ru-C catalyst two phases, e.g. Pt-Ru-fcc and Ru-hcp were refined using the Rietveld method. Crystallite sizes were 3.9 nm for Pt-Ru-fcc and 2.8 nm for Ru-hcp. STM observations of the surface of GC/Pt-C and GC/Pt-Ru-C electrodes revealed the presence of metal particles of the size in the range 2-6 nm and Pt-C or PtRu-C agglomerates in the range of several tenth of nm. The thickness of the Nafion covering layer determined by AFM is ca. 100 nm. A simplified scheme of the investigated electrodes was created. C3 - Materials Science Forum T1 - Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods VL - 518 SP - 271 EP - 276 DO - 10.4028/www.scientific.net/MSF.518.271 ER -
@conference{ author = "Kowal, Andrzej and Olszewski, Piotr K. and Tripković, Dušan and Stevanović, Rade M.", year = "2006", abstract = "Electrodes, assigned as GC/Pt-C and GC/Pt-Ru-C, were formed by deposition of Pt-based catalysts (47.5 wt % Pt + high surface area carbon) and (54 wt. % Pt-Ru alloy + high surface area carbon) on glassy carbon (GC) discs. X-ray diffraction measurements were used for the determination of the average crystallite size and phase composition of both catalysts. Crystallite size for Pt-C catalyst was 2.9 nm for Pt-fcc. In the diffraction pattern of the Pt-Ru-C catalyst two phases, e.g. Pt-Ru-fcc and Ru-hcp were refined using the Rietveld method. Crystallite sizes were 3.9 nm for Pt-Ru-fcc and 2.8 nm for Ru-hcp. STM observations of the surface of GC/Pt-C and GC/Pt-Ru-C electrodes revealed the presence of metal particles of the size in the range 2-6 nm and Pt-C or PtRu-C agglomerates in the range of several tenth of nm. The thickness of the Nafion covering layer determined by AFM is ca. 100 nm. A simplified scheme of the investigated electrodes was created.", journal = "Materials Science Forum", title = "Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods", volume = "518", pages = "271-276", doi = "10.4028/www.scientific.net/MSF.518.271" }
Kowal, A., Olszewski, P. K., Tripković, D.,& Stevanović, R. M.. (2006). Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods. in Materials Science Forum, 518, 271-276. https://doi.org/10.4028/www.scientific.net/MSF.518.271
Kowal A, Olszewski PK, Tripković D, Stevanović RM. Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods. in Materials Science Forum. 2006;518:271-276. doi:10.4028/www.scientific.net/MSF.518.271 .
Kowal, Andrzej, Olszewski, Piotr K., Tripković, Dušan, Stevanović, Rade M., "Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods" in Materials Science Forum, 518 (2006):271-276, https://doi.org/10.4028/www.scientific.net/MSF.518.271 . .