Nanostructure catalysts prepared by multi-sputtering deposition process for enhanced methanol electrooxidation reaction

Authors: Kyung-Won Park, Young-Woo Lee, Yung-Eun Sung

Abstract:
We report size and/or composition-controlled nanostructure catalysts for direct methanol fuel cells fabricated by means of multi-sputtering deposition process. The size-controlled Pt nanophases ranging from 0.62 ± 0.14 nm to 3.07 ± 0.34 nm in average size with narrow size distribution are fabricated as a function of sputtering power ratio of targets. The composition-controlled PtRu alloy nanophases deposited at different RF power ratio of Pt and Ru targets with the same power of WO₃ target exhibit varied atomic percentages of PtRu, i.e.(79.8:21.2),(62.2:37.8) and (37.6:62.4). Furthermore,the PtRu nanophases deposited at a constant RF power ratio of Pt and Ru targets with different power of WO₃ target show controlled average sizes such as 3.62 ± 0.15 nm, 1.86 ± 0.23 nm, and 1.20 ± 0.22 nm with the same compositions. The specific maximum power density of the nanostructure catalyst (∼100Wg−1) is superior to that of the conventional nanostructure catalyst (∼37Wg−1), representing that the nanostructure catalyst has an excellent electrode structure for methanol electrooxidation as compared to the conventional catalyst. 

Keywords:
Electrocatalyst
Direct methanol fuel cells
Size-control
Composition-control
Sputtering deposition process

Published in: Applied Catalysis B: Environmental (Volumes 132–133, Pages 1-552, 27 March 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Nanostructure catalysts prepared by multi-sputtering deposition process for enhanced methanol electrooxidation reaction

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