Triflate anion chemistry for enhanced four-electron zinc–iodine aqueous batteries,Chemical Communications

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Triflate anion chemistry for enhanced four-electron zinc–iodine aqueous batteries
Chemical Communications ( IF 4.3 ) Pub Date : 2024-06-19 , DOI: 10.1039/d4cc02266a
Tingting Liu ₁ , Chengjun Lei ₁ , Huijian Wang ₁ , Wei Yang ₁ , Xin He ₁ , Xiao Liang ₁

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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 Zn²⁺ 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.

中文翻译：

用于增强型四电子锌碘水电池的三氟甲磺酸阴离子化学

I ⁺水解、缓慢的碘氧化还原动力学和锌阳极的不稳定性是水性四电子锌碘电池（4eZIB）的主要挑战。在此，水电解质中的 OTf ^-阴离子化学对于开发先进的 4eZIB 至关重要。研究表明，OTf ^-阴离子与水建立弱氢键（H 键）以稳定 I ⁺物种，同时优化贫水 Zn ²⁺配位结构以减轻 Zn 枝晶和腐蚀。此外，OTf ^-阴离子与碘物质的相互作用导致碘物质的平衡平均分子间键长增加，促进碘的4e氧化还原动力学并提高可逆性。

更新日期：2024-06-19

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