电催化剂
介孔材料
催化作用
X射线光电子能谱
吸附
阴极
化学
密度泛函理论
材料科学
氧气
化学工程
纳米技术
物理化学
电极
电化学
计算化学
工程类
生物化学
有机化学
作者
Mancai Qian,Min Guo,Quan Yuan,Meijiao Xu,Datai Liu,Cheng Hou,Tayirjan Taylor Isimjan,Xiulin Yang
标识
DOI:10.1016/j.jallcom.2022.164527
摘要
Reducing the oxygen adsorption energy barrier is vital to accelerate the oxygen reduction reaction (ORR). Herein, we report a mesoporous cake-like structured Zn-N/Cu-N electrocatalyst (ZnCu-N-C) with robust electrocatalytic performance and exceptional durability in 0.1 M KOH solution. The mesoporous cake-like structure is promising to expose more active sites. Extended X-ray absorption fine spectroscopy and X-ray photoelectron spectroscopy confirmed the existence of M-Nx (M = Zn, Cu). More importantly, the density functional theory (DFT) calculations corroborate that the Zn-N/Cu-N dual active center can reduce the oxygen adsorption energy barrier. Therefore, the optimized ZnCu-N-C electrocatalyst is ahead of commercial Pt/C (20 wt%) in all aspects. Moreover, the ZnCu-N-C-based Zn–air batteries exhibit outstanding long-term stability of 240 cycles, a large power density of 156.2 mW cm−2, and a high specific capacity of 732.7 mA h g−1. This work may provide new guidance for the rational design of cathode catalysts in Zn-air batteries.
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