材料科学
石墨烯
锌
电化学
氧化物
电解质
化学工程
无机化学
法拉第效率
阳极
水溶液
电化学窗口
成核
过电位
纳米技术
离子电导率
冶金
化学
有机化学
电极
物理化学
工程类
作者
Xuyang Wang,Alina V. Kirianova,Xieyu Xu,Yanguang Liu,Olesya O. Kapitanova,Marat O. Gallyamov
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2021-12-24
卷期号:33 (12): 125401-125401
被引量:9
标识
DOI:10.1088/1361-6528/ac40bf
摘要
Aqueous zinc-ion batteries have attracted the attention of the industry due to their low cost, good environmental friendliness, and competitive gravimetric energy density. However, zinc anodes, similar to lithium, sodium and other alkali metal anodes, are also plagued by dendrite problems. Zinc dendrites can penetrate through polymer membranes, and even glass fiber membranes which seriously hinders the development and application of aqueous zinc-ion batteries. To resolve this issue, certain additives are required. Here we have synthesized an electrochemical graphene oxide with novel electrolyte based on tryptophan, which allows to obtain few-layered sheets with a remarkably uniform morphology, good aqueous solution dispersion, easy preparation and environmental friendliness. We used this electrochemical graphene oxide as an additive to the electrolyte for aqueous zinc-ion batteries. The results of phase-field model combined with experimental characterization revealed that the addition of this material effectively promotes the uniform distribution of the electric field and the Zn-ion concentration field, reduces the nucleation overpotential of Zn metal, and provides a more uniform deposition process on the metal surface and improved cyclability of the aqueous Zn-ion battery. The resultant Zn∣Zn symmetric battery with the electrochemical graphene oxide additive affords a stable Zn anode, which provided service for more than 500 h at 0.2 mA cm-2and even more than 250 h at 1.0 mA cm-2. The Coulombic efficiency (98.7%) of Zn∣Cu half-cells and thus cyclability of aqueous Zn-ion batteries using electrochemical graphene oxide is significantly better compared to the additive-free electrolyte system. Therefore, our approach paves a promising avenue to foster the practical application of aqueous Zn-ion batteries for energy storage.
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