双功能
纳米颗粒
热解
纳米壳
化学工程
碳纤维
氧气
金属
材料科学
涂层
析氧
阴极
催化作用
无机化学
纳米技术
电化学
化学
电极
有机化学
冶金
物理化学
复合材料
工程类
复合数
作者
Yijin Wu,Xiaoqing Wu,Teng-xiu Tu,Pengfang Zhang,Jun‐Tao Li,Yao Zhou,Ling Huang,Shi‐Gang Sun
标识
DOI:10.1016/j.apcatb.2020.119259
摘要
Efficient bifunctional oxygen electrocatalysts are essential for high-performance rechargeable Zn-air batteries (rZABs). Herein, a porous hollow carbon nanoshell ([email protected]/N/C) in which FeNx and CoNx metal sites are atomically dispersed and interfaced intimately with metallic Co nanoparticles was derived from pyrolysis of polydopamine-coated ZnCo-ZIFs adsorbed with Fe3+; the chemical interactions among different organic and metal species during the polymer-coating process was inverstigated; their role in regulating the size of the Co nanoparticles, the structure of the hollow carbon nanoshell and the formation of the FeNx-CoNx dual active sites was revealed. The [email protected]/N/C showed superior bifunctional oxygen electrocatalytic activity (ΔE = 0.698 V) and mass activity of 6.8 A gcat.−1 at 0.9 V, outperforming the commercial Pt/C/RuO2 catalysts or the Fe/N/C or Co/N/C counterparts. When assembled for rZABs, the [email protected]/N/C cathode displayed a long cycle life of 200 h (Egap of about 1.0 [email protected] mA cm-2).
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