期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 24, 页码 8152-8159出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b01036
关键词
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资金
- Collaborative Innovation Center of Suzhou Nano Science and Technology, MOST of China [2014CB932700]
- NSFC [21603208, 21573206, 21373259, 51371164]
- China Postdoctoral Science Foundation [2015M580536, 2016T90569]
- Strategic Priority Research Program of the CAS [XDB01020000, XDA09030102]
- Key Research Program of Frontier Sciences of the CAS [QYZDB-SSW-SLH017]
- Hundred Talents project of the CAS
- Fundamental Research Funds for the Central Universities
The research of active and sustainable electrocatalysts toward oxygen reduction reaction (ORR) is of great importance for industrial application of fuel cells. Here, we report a remarkable ORR catalyst with both excellent mass activity and durability based on sub 2 nm thick Rh-doped Pt nanowires, which combine the merits of high utilization efficiency of Pt atoms, anisotropic one-dimensional nanostructure, and doping of Rh atoms. Compared with commercial Pt/C catalyst, the Rh-doped Pt nanowires/C catalyst shows a 7.8 and 5.4-fold enhancement in mass activity and specific activity, respectively. The combination of extended X-ray absorption fine structure analysis and density functional theory calculations reveals that the compressive strain and ligand effect in Rh-doped Pt nanowires optimize the adsorption energy of hydroxyl and in turn enhance the specific activity. Moreover, even after 10000 cycles of accelerated durability test in O-2 condition, the Rh-doped. Pt nanowires/C catalyst exhibits a drop of 9.2% in mass activity, against a big decrease of 72.3% for commercial Pt/C. The improved durability can be rationalized by the increased vacancy formation energy of Pt atoms for Rh-doped Pt nanowires.
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