Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 907, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.164527
Keywords
Energy barrier; Oxygen reduction reaction; Mesoporous structure; Density functional theory; Zn-air batteries
Categories
Funding
- National Natural Science Foundation of China [21965005]
- Natural Science Foundation of Guangxi Province [2018GXNSFAA294077, 2021GXNSFAA076001]
- Project of High-Level Talents of Guangxi [F-KA18015]
- Guangxi Technology Base and Talent Subject [GUIKE AD18126001, GUIKE AD20297039]
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This study reports a mesoporous cake-like structured ZnCu-N-C electrocatalyst with robust electrocatalytic performance and durability. The electrocatalyst reduces the oxygen adsorption energy barrier, resulting in exceptional performance in the oxygen reduction reaction.
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. (c) 2022 Elsevier B.V. All rights reserved.
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