Volume 63, Issue 49 e202410848
Research Article

Diatomic Catalysts for Aqueous Zinc-Iodine Batteries: Mechanistic Insights and Design Strategies

Peng Hei

Peng Hei

Department of Chemistry, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

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Ya Sai

Ya Sai

Department of Chemistry, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

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Wenjie Li

Wenjie Li

Department of Chemistry, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

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Jianming Meng

Jianming Meng

Department of Chemistry, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

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Yulai Lin

Yulai Lin

Department of Chemistry, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

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Xiaoqi Sun

Xiaoqi Sun

Department of Chemistry, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

National Frontiers Science Center for Industrial Intelligence and Systems Optimization, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

Key Laboratory of Data Analytics and Optimization for Smart Industry, Northeastern University), Ministry of Education, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

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Jing Wang

Corresponding Author

Jing Wang

State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004 China

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Yu Song

Corresponding Author

Yu Song

Department of Chemistry, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

National Frontiers Science Center for Industrial Intelligence and Systems Optimization, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

Key Laboratory of Data Analytics and Optimization for Smart Industry, Northeastern University), Ministry of Education, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

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Xiao-Xia Liu

Xiao-Xia Liu

Department of Chemistry, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

National Frontiers Science Center for Industrial Intelligence and Systems Optimization, Northeastern University, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

Key Laboratory of Data Analytics and Optimization for Smart Industry, Northeastern University), Ministry of Education, 3-11, Wenhua Road, Heping district, Shenyang, 110819 China

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First published: 13 September 2024
Citations: 25

Graphical Abstract

The spin exchange effect between diatomic sites activates the diatomic catalysts, effectively suppressing the shuttle effect of triiodide and facilitating the iodine conversion reaction. Utilizing MnZn−NC diatomic catalysts, the zinc-iodine battery demonstrates both a high specific capacity and exceptional cycling stability over 320,000 cycles.

Abstract

There has been a growing interest in developing catalysts to enable the reversible iodine conversion reaction for high-performance aqueous zinc-iodine batteries (AZIBs). While diatomic catalysts (DACs) have demonstrated superior performance in various catalytic reactions due to their ability to facilitate synergistic charge interactions, their application in AZIBs remains unexplored. Herein, we present, for the first time, a DAC comprising Mn−Zn dual atoms anchored on a nitrogen-doped carbon matrix (MnZn−NC) for iodine loading, resulting in a high-performance AZIB with a capacity of 224 mAh g−1 at 1 A g−1 and remarkable cycling stability over 320,000 cycles. The electron hopping along the Mn−N−Zn bridge is stimulated via a spin exchange mechanism. This process broadens the Mn 3dxy band width and enhances the metallic character of the catalyst, thus facilitating charge transfer between the catalysts and reaction intermediates. Additionally, the increased electron occupancy within the d-orbital of Zn elevates Zn's d-band center, thereby enhancing chemical interactions between MnZn−NC and I-based species. Furthermore, our mechanism demonstrates potential applicability to other Metal-Zn−NC DACs with spin-polarized atoms. Our work elucidates a clear mechanistic understanding of diatomic catalysts and provides new insights into catalyst design for AZIBs.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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