Journal
NANO RESEARCH
Volume 7, Issue 3, Pages 410-417Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0407-1
Keywords
electrocatalysis; platinum; submonolayer; fuel cell
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Funding
- Hong Kong Research Grants Council (RGC) [PolyU 5029/12P]
- Hong Kong Polytechnic University
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A facile design of Pt nanostructures from submonolayer to monolayer has been realized by ion adsorption-in situ electrochemical reduction on Au nanoparticles supported on multiwall carbon nanotubes (CNTs). The as prepared Au@Pt/CNTs catalysts display coverage-specific electrocatalysis. Au@Pt/CNTs with low Pt coverage is inactive towards methanol oxidation whereas it oxidizes formic acid effectively through a direct pathway with mass specific activity 90 times that of a commercial Pt/C catalyst. Due to its inertness to methanol, it shows high performance in the oxygen reduction reaction (ORR) with high methanol tolerance. In contrast, simply increasing the Pt coverage to above 40% switches the formic acid oxidation process to both direct and indirect catalytic pathways, and also results in high methanol oxidation activity.
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