Volume 21, Issue 24 2412696
Research Article

Engineering Triple Phase Interface and Axial Coordination Design of Single-Atom Electrocatalysts for Rechargeable Zn─air Batteries

Chun Hua

Chun Hua

Department of Chemistry & Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai, 200444 P. R. China

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Daixin Ye

Daixin Ye

Department of Chemistry & Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai, 200444 P. R. China

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Cong Chen

Cong Chen

Department of Chemistry & Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai, 200444 P. R. China

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Congli Sun

Congli Sun

States State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Jianhui Fang

Jianhui Fang

Department of Chemistry & Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai, 200444 P. R. China

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Lijia Liu

Corresponding Author

Lijia Liu

Department of Chemistry, Western University, 1151 Richmond Street, London, ON, N6A5B7 Canada

E-mail: [email protected]; [email protected]; [email protected]

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Hui Bai

Corresponding Author

Hui Bai

State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan, Shanxi, 030024 China

E-mail: [email protected]; [email protected]; [email protected]

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Ya Tang

Ya Tang

Department of Chemistry & Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai, 200444 P. R. China

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Hongbin Zhao

Corresponding Author

Hongbin Zhao

Department of Chemistry & Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai, 200444 P. R. China

E-mail: [email protected]; [email protected]; [email protected]

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Jiujun Zhang

Jiujun Zhang

Department of Chemistry & Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai, 200444 P. R. China

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First published: 09 May 2025
Citations: 2

Abstract

Bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are highly desirable for rechargeable Zn─air batteries (rZABs). Herein, a space optimized 3D heterostructure Co-N-C@MoS2 catalyst with Co single atom and Co cluster sites is developed by pyrolysis of ZIF-67 and in situ grown ultrathin MoS2 nanosheets. The introduced MoS2 not only has abundant defective structures, but also regulates the Co electronic distribution, thus introducing additional active sites and enhancing Co-Nx activity. In addition, the MoS2 modification leads to an appropriate increase in hydrophilicity which can make a stable liquid/gas/solid triple phase interface, facilitating the approachability of electrolytes into the porous channels and promotes the mass transfer through ensuring a favorite contact among the catalyst, electrolyte and reactants and enhancing utility of active reaction sites. Comprehensive analysis and theoretical simulation indicate that the enhancement of activity stems from the axial coordination of Co cluster over Co single-atom active sites to regulate local electronic structure, thereby optimizing the adsorption of ORR intermediates and enhancing the catalytic activity. Compared with the commercial Pt/C and IrO2, the structurally optimized Co-N-C@MoS2 catalyst displays exceptional bifunctional electrocatalytic activity and long-time stability toward both OER and ORR. Moreover, the Co-N-C@MoS2 catalyst exhibits higher peak power density and superior stability in liquid and flexible ZABs compared to the commercial Pt/C + IrO2 catalyst.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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