A twelve-electron conversion iodine cathode enabled by interhalogen chemistry in aqueous solution

Wenjiao Ma, Tingting Liu, Chen Xu, Chengjun Lei, Pengjie Jiang, Xin He and Xiao Liang ()
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Wenjiao Ma: Hunan University
Tingting Liu: Hunan University
Chen Xu: Hunan University
Chengjun Lei: Hunan University
Pengjie Jiang: Hunan University
Xin He: Hunan University
Xiao Liang: Hunan University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract The battery chemistry aiming for high energy density calls for the redox couples that embrace multi-electron transfer with high redox potential. Here we report a twelve-electron transfer iodine electrode based on the conversion between iodide and iodate in aqueous electrolyte, which is six times than that of the conventional iodide/iodine redox couple. This is enabled by interhalogen chemistry between iodine (in the electrode) and bromide (in the acidic electrolyte), which provides an electrochemical-chemical loop (the bromide-iodate loop) that accelerates the kinetics and reversibility of the iodide/iodate electrode reaction. In the deliberately designed aqueous electrolyte, the twelve-electron iodine electrode delivers a high specific capacity of 1200 mAh g−1 with good reversibility, corresponding to a high energy density of 1357 Wh kg−1. The proposed iodine electrode is substantially promising for the design of future high energy density aqueous batteries, as validated by the zinc-iodine full battery and the acid-alkaline decoupling battery.

Date: 2023
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DOI: 10.1038/s41467-023-41071-6

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