首页|An aqueous magnesium-ion hybrid supercapacitor operated at-50 ℃

An aqueous magnesium-ion hybrid supercapacitor operated at-50 ℃

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The recent advances in aqueous magnesium-ion hybrid supercapacitor(MHSC)have attracted great attention as it brings together the benefits of high energy density,high power density,and synchronously addresses cost and safety issues.However,the freeze of aqueous electrolytes discourages aqueous MHSC from operating at low-temperature conditions.Here,a low-concentration aqueous solution of 4 mol L-1 Mg(ClO4)2 is devised for its low freezing point(-67 ℃)and ultra-high ionic conductivity(3.37 mS cm-1at-50 ℃).Both physical characterizations and computational simulations revealed that the Mg(C1O4)2 can effectively disrupt the original hydrogen bond network among water molecules via transmuting the electrolyte structure,thus yielding a low freezing point.Thus,the Mg(ClO4)2 electrolytes endue aqueous MHSC with a wider temperature operation range(-50 ℃-25 ℃)and a higher energy density of 103.9 Wh kg-1 at 3.68 kW kg-1 over commonly used magnesium salts(i.e.,MgSO4 and Mg(NO3)2)electrolytes.Furthermore,a quasi-solid-state MHSC based on polyacrylamide-based hydrogel electrolyte holds superior low-temperature performance,excellent flexibility,and high safety.This work pioneers a convenient,cheap,and eco-friendly tactic to procure low-temperature aqueous magnesium-ion energy storage device.

Low-concentration aqueous electrolyteAnti-freezing propertyMagnesium-ion hybrid supercapacitorHigh energy density

Guoshen Yang、Gangrui Qu、Chi Fang、Jie Deng、Xianqi Xu、Yinghao Xie、Tian Sun、Yachao Zhu、Jiaxin Zheng、Hang Zhou

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School of Electronic and Computer Engineering,Peking University Shenzhen Graduate School,Shenzhen,518055,China

School of Advanced Materials,Peking University Shenzhen Graduate School,Shenzhen,China

College of Food and Biological Engineering,Chengdu University,Chengdu,610106,China

Institute Charles Gerhardt Montpellier,UMR 5253,Universitáe Montpellier,Montpellier,CC 1502,France

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深圳市科创委项目深圳市科创委项目深圳市科创委项目深圳市科创委项目Guangdong Basic and Applied Basic Research FoundationGuangdong Introducing Innovative and Entrepreneurial Teams Program深圳市科技计划

JCYJ20190806145609284GJHZ20190820091203667JSGG20201102161000002SGD-X202011030956070222020A15150107162019ZT08Z656KQTD20190929172522-248

2024

10.1016/j.gee.2022.09.004

绿色能源与环境(英文)

绿色能源与环境(英文)

CSTPCD
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年,卷(期)：2024.9(4)
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