Tuning Structural and Electronic Configuration of FeN4 via External S for Enhanced Oxygen Reduction Reaction
Shidong Li , Lixue Xia , Jiantao Li , Zhuo Chen , Wei Zhang , Jiexin Zhu , Ruohan Yu , Fang Liu , Sungsik Lee , Yan Zhao , Liang Zhou , Liqiang Mai
Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (2) : 12560
Tuning Structural and Electronic Configuration of FeN4 via External S for Enhanced Oxygen Reduction Reaction
The Fe-N-C material represents an attractive oxygen reduction reaction electrocatalyst, and the FeN4 moiety has been identified as a very competitive catalytic active site. Fine tuning of the coordination structure of FeN4 has an essential impact on the catalytic performance. Herein, we construct a sulfur-modified Fe-N-C catalyst with controllable local coordination environment, where the Fe is coordinated with four in-plane N and an axial external S. The external S atom affects not only the electron distribution but also the spin state of Fe in the FeN4 active site. The appearance of higher valence states and spin states for Fe demonstrates the increase in unpaired electrons. With the above characteristics, the adsorption and desorption of the reactants at FeN4 active sites are optimized, thus promoting the oxygen reduction reaction activity. This work explores the key point in electronic configuration and coordination environment tuning of FeN4 through S doping and provides new insight into the construction of M-N-C-based oxygen reduction reaction catalysts.
coordination structure / electronic configuration / FeN 4 moiety / oxygen reduction reaction / sulfur doping
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2022 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.
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