Redox-active anthraquinone-based p-conjugated polymer anode for high-capacity aqueous organic hybrid flow battery

JOURNAL OF ENERGY STORAGE(2023)

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摘要
Organic molecules/polymers are currently investigated as redox species for aqueous low-cost hybrid flow bat-teries. In this work, a redox-active anthraquinone-based conjugated polymer synthesized via a facile electro-chemical polymerization approach is reported, which can be employed as a high-capacity anode material for aqueous hybrid flow batteries. The redox-active anthraquinone polymer displays a two-electron-transfer redox reaction at-0.616 V (versus the standard hydrogen electrode, SHE) with fast redox kinetics in aqueous alkaline electrolytes (pH = 12). Paired with a potassium ferrocyanide catholyte, the aqueous hybrid flow battery employed this redox-active anthraquinone polymer as the anode material in aqueous supporting electrolyte of pH = 12 exhibits an open circuit voltage of about 1.09 V, high specific capacity (103.6 mA h g-1 at 2 A g-1) and large mass power density (9.41 W g-1 at 100 % SOC), along with excellent capacity retention (99.948 % per cycle) and energy efficiency (74.1 %) after 100 cycles.
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关键词
Energy storage, Aqueous hybrid flow battery, Anthraquinone polymer, Redox kinetics, Electrochemical polymerization
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