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The Proportion of Fe‐N X , N Doping Species and Fe 3 C to Oxygen Catalytic Activity in Core‐Shell Fe‐N/C Electrocatalyst
Author(s) -
Liu Yanyan,
Zhu Yihua,
Jiang Hongliang,
Shen Jianhua,
Li Chunzhong
Publication year - 2020
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201901571
Subject(s) - electrocatalyst , bifunctional , catalysis , oxygen , x ray photoelectron spectroscopy , materials science , doping , carbon fibers , inorganic chemistry , zinc , x ray absorption spectroscopy , xanes , chemistry , electrode , absorption spectroscopy , chemical engineering , spectroscopy , electrochemistry , metallurgy , physics , organic chemistry , composite material , quantum mechanics , composite number , engineering , biochemistry , optoelectronics
A bifunctional oxygen electrocatalyst composed of iron carbide (Fe 3 C) nanoparticles encapsulated by nitrogen doped carbon sheets is reported. X‐ray photoelectron spectroscopy and X‐ray absorption near edge structure revealed the presence of several kinds of active sites (Fe−N x sites, N doping sites) and the modulated electron structure of nitrogen doped carbon sheets. Fe 3 C@ N ‐CSs shows excellent oxygen evolution and oxygen reduction catalytic activity owing to the modulated electron structure by encapsulated Fe 3 C core via biphasic interfaces electron interaction, which can lower the free energy of intermediate, strengthen the bonding strength and enhance conductivity. Meanwhile, the contribution of the Fe−N x sites, N doping sites and the effect of Fe 3 C core for the electrocatalytic oxygen reaction is originally revealed. The Fe 3 C@ N ‐CSs air electrode‐based zinc‐air battery demonstrates a high open circuit potential of 1.47 V, superior charge‐discharge performance and long lifetime, which outperforms the noble metal‐based zinc‐air battery.