期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 12, 期 46, 页码 15274-15281出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp00767f
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资金
- Korea government [KRF 2010-0029245]
- WCU [R31-2008-000-10035-0]
- National Research Foundation of Korea [2010-0029245] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Combinatorial synthesis and screening were used to identify methanol-tolerant non-platinum cathode electrocatalysts for use in direct methanol fuel cells (DMFCs). Oxygen reduction consumes protons at the surface of DMFC cathode catalysts. In combinatorial screening, this pH change allows one to differentiate active catalysts using fluorescent acid-base indicators. Combinatorial libraries of carbon-supported catalyst compositions containing Ru, Mo, W, Sn, and Se were screened. Ternary and quaternary compositions containing Ru, Sn, Mo, Se were more active than the standard Alonso-Vante catalyst, Ru3Mo0.08Se2, when tested in liquid-feed DMFCs. Physical characterization of the most active catalysts by powder X-ray diffraction, gas adsorption, and X-ray photoelectron spectroscopy revealed that the predominant crystalline phase was hexagonal close-packed (hcp) ruthenium, and showed a surface mostly covered with oxide. The best new catalyst, Ru7.0Sn1.0Se1.0, was significantly more active than Ru3Se2Mo0.08, even though the latter contained smaller particles.
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