Conversion-intercalation competing behaviour of halogen storage on graphite electrode from fluid ZnCl2/ZnBr2 hydrates

Literature Information

Publication Date 2023-12-19
DOI 10.1039/D3CC04755E
Impact Factor 6.222
Authors

Shiguan Xu, Lin Shen, Xiaoxu Wang, Shaonan Gu, Wei Sun, Yuhao Huang


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Abstract

Zinc-based aqueous dual-ion batteries (ADIBs) with halogen-graphite intercalation compound positive electrodes are among the most competitive candidates for next-generation electrochemical energy storage systems. However, most of the electrolytes employed have been gel-like electrolytes; hence, a fundamental understanding of the halogen storage process using fluid hydrates will be essential for constructing efficient Zn-based ADIBs. Herein, the halogen storage mechanism on a graphite electrode from fluid ZnCl2/ZnBr2 hydrates is studied by experimental and computational methods. The results indicate that the halogen storage mechanism is a competition between conversion and intercalation. Moreover, the macroscopic electrode reaction is determined by both the ion-pair solvation state at the graphite–electrolyte interface and the subsequent reactant supply is influenced by the electrode reaction rate.

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