Central electron-enriched NO-FeN4 sites as superior acidic oxygen reduction reaction electrocatalysts for proton exchange membrane fuel cells |
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Authors: | Cheng’an Zhong Tianpei Zhou Nan Zhang Minglong Chen Youxue Xie Wensheng Yan Wangsheng Chu Xusheng Zheng Qian Xu Jiankai Ge Changzheng Wu |
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Institution: | 1.School of Chemistry and Materials Science, and CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China2.National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China3.Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230031, China |
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Abstract: | Developing nobel-metal-free catalysts, especially for iron-nitrogen on carbon (FeNC) materials, has been an urgent demand for wide applications of proton exchange membrane fuel cells (PEMFCs). However, the inferior oxygen reduction reaction (ORR) activity of traditional iron-nitrogen sites in acidic conditions seriously impedes the further improvement of their performance. Herein, we synthesized FeN4 with NO (nitric oxide) group axial modification (denoted as NO-FeN4) on a large scale through a confined small molecule synthesis strategy. Benefitting from the strong electron-withdrawing effect of the NO group, the central electron-rich FeN4 site exhibits ultrahigh ORR activity with a three times higher mass activity (1.1 A·g?1 at 0.85 V) compared to the traditional FeN4 sample, as well as full four-electron reaction selectivity. Moreover, the PEMFC assembled with the as-prepared electrocatalyst also exhibits a greatly enhanced peak power density (>725 mW·cm?2). This work provides a new approach to rationally design advanced M-Nx nonnoble electrocatalysts for the ORR. |
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Keywords: | large-scale customization oxygen reduction reaction proton exchange membrane fuel cell confined small molecule synthesis |
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