期刊
MATTER
卷 3, 期 2, 页码 509-521出版社
CELL PRESS
DOI: 10.1016/j.matt.2020.06.026
关键词
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资金
- Chinese Academy of Sciences [XDB36000000]
- National Basic Research Program of China [2017YFA0206702, 2017YFA0206703]
- Natural Science Foundation of China [21925110, 201890750, 21890754, 21890751, 91745113, 11621063]
- National Program for Support of Top-notch Young Professionals
- Fundamental Research Funds for the Central Universities [WK2060190084]
- Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology
Metal-nitrogen-carbon materials have been demonstrated as the most promising non-noble metal catalyst for proton-exchange membrane fuel cells (PEMFCs) but are still limited by the sluggish kinetics and durability ofmetal-nitrogen active sites. Here, we unravel a planar-like Fe2N6 active site as a highly efficient oxygen reduction catalyst for PEMFCs. Our developed planar-like Fe2N6 structure behaves as a distinguished catalytic mechanism for oxygen reduction, which brings synergic advantages of accelerated catalytic kinetics and highly suppressed side reaction, successfully promoting its catalytic activity and stability. As expected, the planar-like Fe2N6 structure with high density exhibits over 700% increase in mass activity than traditional isolated iron-nitrogen sites. Moreover, a PEMFC built with this catalyst also achieves a large peak power density of 845 mW cm(-2), representing a critical breakthrough for practical application of metal-nitrogen-carbon materials in PEMFC systems. Our findings will provide a new avenue toward designing highly active metal-nitrogen sites for heterogeneous catalysis.
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