双功能
材料科学
催化作用
石墨烯
介孔材料
析氧
纳米颗粒
碳纤维
化学工程
纳米技术
无机化学
电极
电化学
复合数
化学
有机化学
复合材料
工程类
物理化学
作者
Hongliang Jiang,Yifan Yao,Yihua Zhu,Yanyan Liu,Yunhe Su,Xin Yang,Chunzhong Li
标识
DOI:10.1021/acsami.5b06708
摘要
It is highly crucial and challenging to develop bifunctional oxygen electrocatalysts for oxygen reduction reactions (ORRs) and oxygen evolution reactions (OERs) in rechargeable metal-air batteries and unitized regenerative fuel cells (URFCs). Herein, a facile and cost-effective strategy is developed to prepare mesoporous Fe-N-doped graphene-like carbon architectures with uniform Fe3C nanoparticles encapsulated in graphitic layers (Fe3C@NG) via a one-step solid-state thermal reaction. The optimized Fe3C@NG800-0.2 catalyst shows comparable ORR activity with the state-of-the-art Pt/C catalyst and OER activity with the benchmarking RuO2 catalyst. The oxygen electrode activity parameter ΔE (the criteria for judging the overall catalytic activity of bifunctional electrocatalysts) value for Fe3C@NG800-0.2 is 0.780 V, which surpasses those of Pt/C and RuO2 catalysts as well as those of most nonprecious metal catalysts. Significantly, excellent long-term catalytic durability holds great promise in fields of rechargeable metal-air batteries and URFCs.
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