期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 7, 期 12, 页码 2937-2941出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201200722
关键词
electrocatalysis; gold; methanol oxidation; nanostructures; platinum
资金
- National Research Foundation of Korea [2011-0027911]
- Sungkyunkwan University
- National Research Foundation of Korea [2011-0027911] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Here we demonstrate that, in the dealloying process of AuAg nanorods, temperature is the key parameter for producing porous Au nanorods with tunable ligament sizes. The vertically aligned AuAg alloy nanorods were first synthesized by the electrochemical co-deposition of Au and Ag onto anodic aluminum oxide (AAO) membrane templates. Porous Au nanorods were then obtained by selectively etching Ag away from the precursor AuAg alloy nanorods. Control of the ligament size was achieved by controlling the dealloying temperature. Pt deposited on the porous Au nanorods with smaller ligaments exhibited a higher catalytic activity during methanol electrooxidation than those deposited on nanorods with larger ligaments produced by dealloying at higher temperatures. The strong dependence of the catalytic activity on the ligament size of porous Au is principally due to different amounts of carbon monoxide (CO) generated during methanol electrooxidation. Less CO was generated as the ligament size decreased. This finding is of importance for developing highly efficient cathode materials for carrying out methanol electrooxidation in practical applications in which porous Au with a large surface area is used as a supporting substrate.
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