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Hierarchically porous Fe/N/S/C nanospheres with high-content of Fe-Nx for enhanced ORR and Zn-air battery performance

查看全文 作　　者：Luming [1]Wu;Ruge [1]Zhao;Guo [1]Du;Huan [1]Wang;Machuan [2]Hou;Wei [2,3]Zhang;Pingchuan [4]Sun;Tiehong [1,2]Chen 高影响力作者 机构地区：[1]Institute of New Catalytic Materials Science,School of Materials Science and Engineering,Nankai University,Tianjin,300350,China;[2]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Renewable Energy Conversion and Storage Center,College of Chemistry,Nankai University,Tianjin,300071,China;[3]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin,300192,China;[4]Key Laboratory of Functional Polymer Materials(MOE),College of Chemistry,Nankai University,Tianjin,300071,China高影响力机构 出　　处：《Green Energy & Environment》索引2023年第8卷第6期,共10页高影响力期刊 基　　金：supported by National Natural Science Foundation of China (21773128)。 摘　　要：Heteroatom-doped carbon-based transition-metal single-atom catalysts(SACs) are promising electrocatalysts for oxygen reduction reaction(ORR). Herein, with the aid of hierarchically porous silica as hard template, a facile and general melting perfusion and mesopore-confined pyrolysis method was reported to prepare single-atomic Fe/N–S-doped carbon catalyst(FeNx/NC-S) with hierarchically porous structure and well-defined morphology. The FeNx/NC-S exhibited excellent ORR activity with a half-wave potential(E_(1/2)) of 0.92 V, and a lower overpotential of 320 mV at a current density of 10 mA cm^(-2)for OER under alkaline condition. The remarkable electrocatalysis performance can be attributed to the hierarchically porous carbon nanospheres with S doping and high content of Fe-Nx sites(up to 3.7 wt% of Fe), resulting from the nano-confinement effect of the hierarchically porous silica spheres(NKM-5) during the pyrolysis process. The rechargeable Zn-air battery with FeNx/NC-S as a cathode catalyst demonstrated a superior power density of 194.5 mW cm-2charge–discharge stability. This work highlights a new avenue to design advanced SACs for efficient sustainable energy storage and conversion. 关 键 词：Melting perfusion Nano-confined pyrolysis Hierarchically porous High content of Fe-Nx sites Sulfur doping Oxygen reduction reaction
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