Triflate anion chemistry for enhanced four-electron zinc-iodine aqueous batteries

I + hydrolysis, sluggish iodine redox kinetics and the instability of Zn anodes are the primary challenges for aqueous four-electron zinc-iodine batteries (4eZIBs). Herein, the OTf − anion chemistry in aqueous electrolyte is essential for developing advanced 4eZIBs. It is elucidated that OTf − anion...

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Veröffentlicht in:Chemical communications (Cambridge, England) England), 2024-07, Vol.6 (58), p.7447-745
Hauptverfasser: Liu, Tingting, Lei, Chengjun, Wang, Huijian, Yang, Wei, He, Xin, Liang, Xiao
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Sprache:eng
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Zusammenfassung:I + hydrolysis, sluggish iodine redox kinetics and the instability of Zn anodes are the primary challenges for aqueous four-electron zinc-iodine batteries (4eZIBs). Herein, the OTf − anion chemistry in aqueous electrolyte is essential for developing advanced 4eZIBs. It is elucidated that OTf − anions establish weak hydrogen bonds (H bonds) with water to stabilize I + species while optimizing a water-lean Zn 2+ coordination structure to mitigate Zn dendrites and corrosion. Moreover, the interaction of the OTf − anions with the iodine species results in an increased equilibrium average intermolecular bond length of the iodine species, facilitating the 4e redox kinetics of iodine with improved reversibility. OTf − anions establish weak hydrogen-bonds with water to stabilize I + species while optimizing a water-lean Zn 2+ coordination structure to mitigate Zn dendrites and corrosion for developing advanced four-electron zinc-iodine aqueous batteries.
ISSN:1359-7345
1364-548X
1364-548X
DOI:10.1039/d4cc02266a