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Title: Insert Zn2+ in tetrahedral sites of Bi-metal Zn-CO spinel oxides with high oxygen catalytic performance for liquid and flexible zinc-air batteries
Authors: Xu, NN
Nie, Q
Liu, JW
Huang, H 
Qiao, JL
Zhou, XD
Issue Date: 2020
Source: Journal of the Electrochemical Society, Apr. 2020, v. 167, no. 5, 050512, p. 1-10
Abstract: Nowadays, it is very challenging to develop a low-cost, highly active and stable bi-functional catalyst for accelerating oxygen reduction reaction (ORR) and oxygen evolution (OER) reaction during the charge and discharge process of zinc-air battery. Herein, we successfully design a novel bi-metal oxide hybrid catalyst (ZnCo2O4-CNT) by inserting Zn ions. Benefiting from the robust synergetic effects between porous ZnCo2O4 and CNTs, the high conductivity and the unique nanostructure, the ZnCo2O4-CNT shows lots of accessible active sites and improved reactants and electrons transfer. As expected, the hybrid shows higher ORR and OER performances with larger limited diffusion current density (5.72 mA cm(-2)) and lower OER over-potential (0.49 V) than Pt/C and other ZnCo2O4-CNT samples. In addition, rechargeable zinc-air battery assembled with the bi-functional catalyst exhibits a high power density of 249.4 mW cm(-2), a strong discharge durability and charge-discharge stability of 240 cycles. Notably, the flexible zinc-air battery also shows good battery performances with high power density and good flexibility. Hence, exploiting efficient bi-functional catalytic materials with excellent ORR and OER performance and assembling flexible devices will improve the development of current zinc-air batteries battery industry.
Publisher: IOP Publishing published on behalf of the Electrochemical Society
Journal: Journal of the Electrochemical Society 
ISSN: 0013-4651
EISSN: 1945-7111
DOI: 10.1149/1945-7111/ab6e5d
Rights: © 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited. This is an open accessarticle distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY,, which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.
The following publication Nengneng Xu et al 2020 J. Electrochem. Soc.167 050512 is available at
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