过电位
材料科学
电解质
双功能
化学工程
催化作用
双金属片
合金
析氧
聚吡咯
碳纤维
冶金
纳米技术
电极
复合材料
金属
化学
电化学
聚合物
聚合
复合数
有机化学
物理化学
工程类
作者
Jinmei Li,Yumao Kang,Wenli Wei,Xin Li,Ziqiang Lei,Peng Liu
标识
DOI:10.1016/j.cej.2020.127961
摘要
Metal-organic frameworks (MOFs) offer great advantages for construction of bimetallic alloys as efficient oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts for rechargeable/flexible Zn-air batteries. Herein, a template-assisted method is developed to reduce the crystal size of CoFe-ZIF via in-situ growing on hollow polypyrrole spheres (h-PPy). As a result, the well-dispersed ultrafine CoFe nanoalloy were obtained with N-doped hollow carbon microspheres (N-HCSs) as support. Owing to the unique alloy structure with ultrafine size, uniform dispersion of the CoFe nanoalloy on the highly conductive N-HCSs support via strong interactions, the proposed CoFe/N-HCSs afford high catalytic activity and stability toward ORR. Interestingly, the CoFe/N-HCSs also deliver a low overpotential of 292 mV at 10 mA cm−2 for OER in alkaline electrolyte, demonstrating their superior bifunctional catalytic performance. Moreover, the CoFe/N-HCSs can endow the liquid Zn-air batteries with better energy density (882.3 Wh kgZn−1) and cycling stability than those of Pt/C catalyst and exhibit potential feasibility in all-solid-state Zn-air batteries.
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