A novel "water in salt" electrolyte is reported for the design of a rocking-chair proton battery. In 20 M ZnCl + 1 M HCl electrolyte, the electrochemical proton storage performance using MoO is significantly improved. When coupled with a Ni-PBA cathode, the device exhibits a good cycling stability of 76.1% after 400 cycles. This work opens a new avenue for designing low-cost "water in salt" electrolytes for aqueous proton electrochemistry.
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