电催化剂
双功能
析氧
材料科学
催化作用
石墨烯
电化学
化学工程
纳米颗粒
纳米技术
化学
电极
有机化学
工程类
物理化学
作者
Jinlong Liu,Ziyu Luo,Dong Qian,Lishan Peng,Dongxiao Sun‐Waterhouse,Geoffrey I. N. Waterhouse
标识
DOI:10.1021/acs.jpclett.2c01687
摘要
The discovery of highly efficient, durable, and affordable bifunctional ORR/OER electrocatalysts is of great significance for the commercialization of rechargeable metal–air batteries. Herein, we synthesized uniformly sized CoNi alloy nanoparticles encapsulated with N-doped few-layer graphene (N-FLG) sheets via pyrolysis of a CoNi dual metal–organic framework precursor. The developed CoNi/N-FLG catalyst exhibited excellent oxygen reduction activity (comparable to a commercial 20 wt % Pt/C catalyst) and outstanding oxygen evolution activity (superior to a commercial 20 wt % IrO2/C catalyst), thus enabling efficient bifunctional oxygen electrocatalysis and stability when applied in prototype rechargeable zinc–air batteries. The remarkable electrochemical properties of CoNi/N-FLG originate from its unique core–shell structure and favorable electron penetration effects, thereby optimizing the adsorption/desorption strengths of intermediates formed during the oxygen reduction and oxygen evolution reactions.
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