Edge‐Rich Fe−N4 Active Sites in Defective Carbon for Oxygen Reduction Catalysis

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Wang, Xin
Jia, Yi
Mao, Xin
Liu, Daobin
He, Wenxiang
Li, Jia
Liu, Jianguo
Yan, Xuecheng
Chen, Jun
Song, Li
Du, Aijun
Yao, Xiangdong
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2020
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Abstract

Controllably constructing nitrogen‐modified divacancies (ND) in carbon substrates to immobilize atomic Fe species and unveiling the advantageous configuration is still challenging, but indispensable for attaining optimal Fe−N−C catalysts for the oxygen reduction reaction (ORR). Herein, a fundamental investigation of unfolding intrinsically superior edge‐ND trapped atomic Fe motifs (e‐ND−Fe) relative to an intact center model (c‐ND−Fe) in ORR electrocatalysis is reported. Density functional theory calculations reveal that local electronic redistribution and bandgap shrinkage for e‐ND−Fe endow it with a lower free‐energy barrier toward direct four‐electron ORR. Inspired by this, a series of atomic Fe catalysts with adjustable ND−Fe coordination are synthesized, which verify that ORR performance highly depends on the concentration of e‐ND−Fe species. Remarkably, the best e‐ND−Fe catalyst delivers a favorable kinetic current density and halfwave potential that can be comparable to benchmark Pt−C under acidic conditions. This work will guide to develop highly active atomic metal catalysts through rational defect engineering.

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Advanced Materials

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32

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16

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Distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License, which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.

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Physical sciences

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Engineering

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Wang, X; Jia, Y; Mao, X; Liu, D; He, W; Li, J; Liu, J; Yan, X; Chen, J; Song, L; Du, A; Yao, X, Edge‐Rich Fe−N4 Active Sites in Defective Carbon for Oxygen Reduction Catalysis, Advanced Materials, 2020, pp. e2000966-

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