期刊
SCIENCE
卷 362, 期 6420, 页码 1276-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aau0630
关键词
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资金
- U.S. DOE Fuel Cell Technologies Office through Office of Energy Efficiency and Renewable Energy
- Office of Science, U.S. DOE [DE-AC02-06CH11357]
- Argonne National Laboratory
- U.S. DOE, Office of Basic Energy Sciences, Chemical, Biological, and Geosciences Division [DE-SC0010379]
- DOE [DE-SC0014664]
- National Energy Research Scientific Computing Center (NERSC), a U.S. DOE Office of Science User Facility [DE-AC02-05CH11231]
- National Key Research and Development Program of China [2016YFB0701200]
- Chinese National Nature Science Foundation [51771112]
Achieving high catalytic performance with the lowest possible amount of platinum is critical for fuel cell cost reduction. Here we describe a method of preparing highly active yet stable electrocatalysts containing ultralow-loading platinum content by using cobalt or bimetallic cobalt and zinc zeolitic imidazolate frameworks as precursors. Synergistic catalysis between strained platinum-cobalt core-shell nanoparticles over a platinum-group metal (PGM)-free catalytic substrate led to excellent fuel cell performance under 1 atmosphere of O-2 or air at both high-voltage and high-current domains. Two catalysts achieved oxygen reduction reaction (ORR) mass activities of 1.08 amperes per milligram of platinum (A mg(Pt)(-1)) and 1.77 A mg(Pt)(-1) and retained 64% and 15% of initial values after 30,000 voltage cycles in a fuel cell. Computational modeling reveals that the interaction between platinum-cobalt nanoparticles and PGM-free sites improves ORR activity and durability.
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