期刊
ADVANCED MATERIALS
卷 33, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202005767
关键词
ethanol oxidation reaction; interfaces Rh nanosheets; selectivity; SnO; (2)
类别
资金
- Ministry of Science and Technology [2016YFA0204100, 2017YFA0208200]
- National Natural Science Foundation of China [21571135, 51802206]
- Young Thousand Talented Program
- Jiangsu Province Natural Science Fund for Distinguished Young Scholars [BK20170003]
- Natural Science Foundation of Jiangsu Province [BK20180846]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Xiamen University
This study achieved selective EOR to CO2, with the optimized catalyst showing excellent performance, providing fundamental research for the design of efficient catalysts for EOR.
Direct ethanol fuel cells (DEFCs) are regarded as an attractive power source with high energy density, bio-renewability, and convenient storage and transportation. However, the anodic reaction of DEFCs, that is, the ethanol oxidation reaction (EOR), suffers from poor efficiency due to the low selectivity to CO2 (C1 pathway) and high selectivity to CH3COOH (C2 pathway). In this study, the selective EOR to CO2 can be achieved at the Rh-SnO2 interface in SnO2-Rh nanosheets (NSs). The optimized catalyst of 0.2SnO(2)-Rh NSs/C exhibits excellent alkaline EOR performance with a mass activity of 213.2 mA mg(Rh)(-1) and a Faraday efficiency of 72.8% for the C1 pathway, which are 1.7 and 1.9 times higher than those of Rh NSs/C. Mechanism studies indicate that the strong synergy at the Rh-SnO2 interface significantly promotes the breaking of C-C bond of C2H5OH to form CO2, and facilitates oxidation of the poisonous intermediates (*CO and *CH3) to suppress the deactivation of the catalyst. This work not only provides a highly selective, active, and stable catalyst for the EOR, but also promotes fundamental research for the design of efficient catalysts via interface modification.
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