期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 33, 页码 11527-11533出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201906137
关键词
C-C bond cleavage; electro-oxidation; in situ studies; intermetallic structures; nanoparticles; ternary nanoparticles
资金
- U.S. Army Research Laboratory [W911NF-15-1-0147]
- U.S. Army Research Office [W911NF-15-1-0147]
- US Department of Energy, Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office
- U.S. DOE [DE-AC02-06CH11357]
- Canadian Light Source
- U.S. DOE, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
Efficient electro-oxidation of formic acid, methanol, and ethanol is challenging owing to the multiple chemical reaction steps required to accomplish full oxidation to CO2. Herein, a ternary CoPtAu nanoparticle catalyst system is reported in which Co and Pt form an intermetallic L1(0)-structure and Au segregates on the surface to alloy with Pt. The L1(0)-structure stabilizes Co and significantly enhances the catalysis of the PtAu surface towards electro-oxidation of ethanol, methanol, and formic acid, with mass activities of 1.55 A/mg(Pt), 1.49 A/mg(Pt), and 11.97 A/mg(Pt), respectively in 0.1 m HClO4. The L1(0)-CoPtAu catalyst is also stable, with negligible degradation in mass activities and no obvious Co/Pt/Au composition changes after 10 000 potential cycles. The in situ surface-enhanced infrared absorption spectroscopy study indicates that the ternary catalyst activates the C-C bond more efficiently for ethanol oxidation.
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