Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 23, Pages 6533-6538Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201702332
Keywords
electrocatalysis; ethanol oxidation; IR spectroscopy; octahedral nanoparticles; PtNiRh
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Funding
- Federal Ministry of Education and Research [16N11929]
- German Research Foundation (DFG) [STR 596/4-1, STR 596/5-1]
- Zentraleinrichtung fur Elektronenmikroskopie (Zelmi) of the Technical University Berlin
- TEM
- Deutsche Forschungsgemeinschaft (DFG) [HE 7192/1-1]
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Direct ethanol fuel cells are attractive power sources based on a biorenewable, high energy-density fuel. Their efficiency is limited by the lack of active anode materials which catalyze the breaking of the C-C bond coupled to the 12-electron oxidation to CO2. We report shape-controlled PtNiRh octahedral ethanol oxidation electrocatalysts with excellent activity and previously unachieved low onset potentials as low as 0.1V vs. RHE, while being highly selective to complete oxidation to CO2. Our comprehensive characterization and in situ electrochemical ATR studies suggest that the formation of a ternary surface site ensemble around the octahedral Pt3Ni1Rhx nanoparticles plays a crucial mechanistic role for this behavior.
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