Towards High-Performance Electrocatalysts for Oxygen Reduction: Inducing Atomic-Level Reconstruction of Fe-Nx Site for Atomically Dispersed Fe/N-Doped Hierarchically Porous Carbon

被引：28
作者：
Li, Hanyu [1 ,2 ]
Zhang, Zhengping [1 ,2 ]
Dou, Meiling [1 ,2 ]
Wang, Feng [1 ,2 ]
机构：
[1] Beijing Univ Chem Technol, Lab Electrochem Proc & Technol Mat, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
[2] Beijing Univ Chem Technol, Beijing Adv Innovat Ctr Soft Matter Sci & Engn, Beijing 100029, Peoples R China
来源：
CHEMISTRY-A EUROPEAN JOURNAL | 2018年 / 24卷 / 35期
关键词：
atomic-level reconstruction; electrocatalysts; hierarchically porous structures; oxygen reduction reaction; pig bone; MEMBRANE FUEL-CELLS; CATHODE CATALYST; IRON; METAL; COBALT; NANOPARTICLES; FRAMEWORKS; PYROLYSIS; EVOLUTION; MEDIA;
D O I：
10.1002/chem.201800937
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A rational and effective strategy for the synthesis of a high-performance non-precious metal electrocatalyst for oxygen reduction reaction (ORR) was developed by inducing reconstruction of Fe-N-x site on pig-bone-derived nitrogen-doped hierarchically porous carbon. The resultant Fe/N-doped carbon electrocatalyst possessed abundant atomically dispersed non-planar Fe-N-4 ORR active sites, with absolute presence of active D1 (Fe-II-N-4) and D3 (N-Fe-II-N2+2) sites, as well as large specific surface area and three-dimensional porous structure with hierarchical micro-/meso-/macro-pore distribution, which increased the utilization of active sites and promoted mass transport of ORR reactants. This resulted in a remarkably superior ORR activity with half-wave potential of 0.87V (20mV higher than Pt/C) and kinetic current density of 10.9mAcm(-2) at 0.85V (2.3-fold of Pt/C) in alkaline electrolyte. This methodology provides a route for atomic-level design of high-performance ORR electrocatalyst.
引用
收藏
页码：8848 / 8856
页数：9
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