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首页> 外文期刊>Advanced functional materials >Pre-Protonated Vanadium Hexacyanoferrate for High Energy-Power and Anti-Freezing Proton Batteries
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Pre-Protonated Vanadium Hexacyanoferrate for High Energy-Power and Anti-Freezing Proton Batteries

机译：Pre-Protonated Vanadium Hexacyanoferrate for High Energy-Power and Anti-Freezing Proton Batteries

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摘要

Proton batteries have been considered as an innovative energy storage technologyowing to their high safety and cost-effectiveness. However, the developmentof fast-charging proton batteries with high energy/power density isgreatly limited by feasible material selection. Here, the pre-protonated vanadiumhexacyanoferrate (H-VHCF) is developed as a proton cathode materialto alleviate the capacity loss of proton-free electrode materials during electrochemicaltests. The pre-protonation process realizes fast and long-distancetransport of protons by shortening diffusion path and reducing migrationbarriers. Benefitting from the enhanced hydrogen bonding network combinedwith dual redox reactions of V and Fe in protonated H-VHCF cathode,a high energy density of 74 Wh kg~(?1) at 1.1 kW kg~(?1), and a maximum powerdensity of 54 kW kg~(?1) at 65 Wh kg~(?1) is achieved for the asymmetric protonbatteries coupling with MoO3/Mxene anode. Proton transport and doubleoxidation-reduction center are verified by theoretical calculations and ex situexperimental measurements. Considering the anti-freezing availability ofproton batteries, 82.5 of its initial capacity is maintained after 10000 cyclesunder ?40 ℃ at 0.5 A g~(?1). As a proof-of-concept, flexible device fabricated byoptimized electrodes and hydrogel electrolytes can power up a light-emittingdiode even under a bent state.

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