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Synergistic Effects between Atomically Dispersed Fe−N−C and C−S−C for the Oxygen Reduction Reaction in Acidic Media
Author(s) -
Shen Hangjia,
GraciaEspino Eduardo,
Ma Jingyuan,
Zang Ketao,
Luo Jun,
Wang Le,
Gao Sanshuang,
Mamat Xamxikamar,
Hu Guangzhi,
Wagberg Thomas,
Guo Shaojun
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201706602
Subject(s) - sulfur , catalysis , oxygen reduction reaction , thiophene , chemistry , oxygen , doping , conductivity , inorganic chemistry , oxygen reduction , fuel cells , chemical engineering , materials science , organic chemistry , electrochemistry , electrode , optoelectronics , engineering
Various advanced catalysts based on sulfur‐doped Fe/N/C materials have recently been designed for the oxygen reduction reaction (ORR); however, the enhanced activity is still controversial and usually attributed to differences in the surface area, improved conductivity, or uncertain synergistic effects. Herein, a sulfur‐doped Fe/N/C catalyst (denoted as Fe/SNC) was obtained by a template‐sacrificing method. The incorporated sulfur gives a thiophene‐like structure (C−S−C), reduces the electron localization around the Fe centers, improves the interaction with oxygenated species, and therefore facilitates the complete 4 e − ORR in acidic solution. Owing to these synergistic effects, the Fe/SNC catalyst exhibits much better ORR activity than the sulfur‐free variant (Fe/NC) in 0.5 m H 2 SO 4 .
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