催化作用
未成对电子
电催化剂
氧气
价(化学)
活动站点
电子结构
解吸
化学
光化学
无机化学
吸附
计算化学
物理化学
分子
有机化学
电化学
电极
作者
Shidong Li,Lixue Xia,Jiantao Li,Zhuo Chen,Wei Zhang,Jiexin Zhu,Ruohan Yu,Fang Liu,Sungsik Lee,Yan Zhao,Liang Zhou,Liqiang Mai
出处
期刊:Energy & environmental materials
日期:2023-01-30
卷期号:7 (2)
被引量:9
摘要
The Fe–N–C material represents an attractive oxygen reduction reaction electrocatalyst, and the FeN 4 moiety has been identified as a very competitive catalytic active site. Fine tuning of the coordination structure of FeN 4 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 FeN 4 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 FeN 4 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 FeN 4 through S doping and provides new insight into the construction of M–N–C‐based oxygen reduction reaction catalysts.
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