A twelve-electron conversion iodine cathode enabled by interhalogen chemistry in aqueous solution.
basic_science · Level V
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- Record sourced from PubMed, PMID 37679335.
- Also identified by DOI 10.1038/s41467-023-41071-6 and PMC identifier 10484974.
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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<sup>-1</sup> with good reversibility, corresponding to a high energy density of 1357 Wh kg<sup>-1</sup>. 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.