Poly(vinyl alcohol) hydrogel containing deep eutectic solvents as electrolytes with co-nonsolvency effect for anti-freezing zinc-ion hybrid supercapacitors

被引：1
作者：
Bai, Xinyuan
He, Yapeng
Deng, Yongqi
Feng, Jianming
Yan, Lifeng [1 ]
机构：
[1] Univ Sci & Technol China, Key Lab Precis & Intelligent Chem, Jinzhai Rd 96, Hefei 230026, Anhui, Peoples R China
来源：
JOURNAL OF POWER SOURCES | 2025年 / 632卷
基金：
中国国家自然科学基金;
关键词：
Deep eutectic solvents; Co-nonsolvency effect; Freezing-tolerance capability; Hydrogel electrolyte;
D O I：
10.1016/j.jpowsour.2025.236354
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
An anti-freezing, low-cost, and high-strength poly(vinyl alcohol) (PVA) hydrogel electrolyte containing Zn (ClO4)2 & sdot;6H2O/ethylene glycol (EG) deep eutectic solvents (DES) and water is designed based on the effect of cononsolvency. The sodium dodecyl benzene sulfonate (SDBS) is proposed as an additive to regulate the solvation shell, releasing more ClO4- ions, and H2O in the solvation structure. The ClO4- ions, EG, and SDBS synergistically destroy the consecutive hydrogen bonding network among H2O molecules, depressing the solid-liquid transition temperature of the DES-SxP gel to-56.98 degrees C. Moreover, the generation of new H-bonds among ClO4- ions, EG, and SDBS with H2O immeasurably prohibits the activity of H2O, disrupting the hazardous side reactions as well as dendrites related to H2O molecules and extremely extending the electrochemical window (3.04 V). The assembled Zn||Zn symmetrical cells can cycle over 980 h at 1 mA cm- 2 at room temperature. The internal resistance of zinc-ion hybrid supercapacitors declined to 17.02 Omega and the cyclic stability of zinc-ion hybrid supercapacitors improved to 8000 cycles with a considerable specific capacity of 88.75 mAh g- 1 at 5 A g- 1 and 20000 cycles with 65.71 mAh g- 1 at 10 A g- 1 under-20 degrees C.
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页数：10
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