首页|Energy barrier engineering of oxygen reduction reaction synergistically promoted by binary Zn-Cu pair sites for advanced Zn–air batteries
Energy barrier engineering of oxygen reduction reaction synergistically promoted by binary Zn-Cu pair sites for advanced Zn–air batteries
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NSTL
Elsevier
? 2022 Elsevier B.V.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.
Density functional theoryEnergy barrierMesoporous structureOxygen reduction reactionZn–air batteries
Qian M.、Guo M.、Qu Y.、Xu M.、Liu D.、Hou C.、Yang X.、Isimjan T.T.
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Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical Sciences Guangxi Normal University
Saudi Arabia Basic Industries Corporation (SABIC) at King Abdullah University of Science and Technology (KAUST)
NSTL
Elsevier
