电解质
阳极
材料科学
锌
分子
水溶液
无机化学
化学工程
金属
溶剂化
化学
电极
有机化学
冶金
物理化学
工程类
作者
Jing Xu,Wenli Lv,Yang Wang,Yang Jin,Qianzheng Jin,Bin Sun,Zili Zhang,Tianyi Wang,Linfeng Zheng,Xiaolong Shi,Bing Sun,Guoxiu Wang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-07-18
卷期号:16 (7): 11392-11404
被引量:207
标识
DOI:10.1021/acsnano.2c05285
摘要
The strong activity of water molecules causes a series of parasitic side reactions on Zn anodes in the aqueous electrolytes. Herein, we introduce silk fibroin (SF) as a multifunctional electrolyte additive for aqueous zinc-ion (Zn-ion) batteries. The secondary structure transformation of SF molecules from α-helices to random coils in the aqueous electrolytes allows them to break the hydrogen bond network among free water molecules and participate in Zn2+ ion solvation structure. The SF molecules released from the [Zn(H2O)4(SF)]2+ solvation sheath appear to be gradually adsorbed on the surface of Zn anodes and in situ form a hydrostable and self-healable protective film. This SF-based protective film not only shows strong Zn2+ ion affinity to promote homogeneous Zn deposition but also has good insulating behavior to suppress parasitic reactions. Benefiting from these multifunctional advantages, the cycle life of the Zn||Zn symmetric cells reaches over 1600 h in SF-containing ZnSO4 electrolytes. In addition, by adopting a potassium vanadate cathode, the full cell shows excellent cycling stability for 1000 cycles at 3 A g–1. The in situ construction of a protective film on the Zn anode from natural protein molecules provides an effective strategy to achieve high-performance Zn metal anodes for Zn-ion batteries.
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