催化作用
材料科学
热解
价(化学)
金属
Atom(片上系统)
化学工程
X射线光电子能谱
烧结
光谱学
碳纤维
纳米技术
化学
冶金
有机化学
复合材料
物理
量子力学
复合数
计算机科学
工程类
嵌入式系统
作者
Wei Wang,Chuangang Hu,Liguang Wang,Yang Yuan,Kai Zhu,Qing Zhang,Lin Yang,Jun Lü,Zhengyu Bai
标识
DOI:10.1002/adfm.202304277
摘要
Abstract Atomically dispersed iron–nitrogen–carbon (FeNC) catalysts have sparked great interest by virtue of the highly active isolated FeN 4 sites. The catalysts with pyrolysis treatment usually induce inevitable FeN 4 sites agglomeration, leading to fast degradation in catalytic activity. Herein, a pre‐coordinated protection strategy is proposed to eliminate the aggregation of Fe atoms by suppressing the thermal migration during the pyrolysis process. To this end, the S atom is introduced into the graphitic support by enhancing the metal‐support interaction. The proposed atomic structure is revealed by multiple advanced characterizations including Fe Mössbauer spectroscopy, X‐ray absorption spectroscopy, and theoretical calculations. By employing S atom into the structure, the center atom Fe is oxidized to a higher valence, improving the bonding energy with the graphitic support, which accordingly endows catalyst anti‐sintering capacity and improved catalytic activity. Compared to commercial Pt/C and the reported catalyst with secondary pyrolysis, the proposed catalysts exhibit enhanced ORR activity in alkaline media ( E 1/2 = 0.91 V). This work provides a new avenue toward optimizing and improving ORR performance of atomically dispersed Fe catalysts.
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