Hydrogel electrolytes with immobilized pair ions via one-pot copolymerization for flexible supercapacitors

Wei Cheng Li, Chih Hung Lo, Kuan Yi Liao, Ten Chin Wen

研究成果: Article同行評審

3 引文 斯高帕斯(Scopus)

摘要

In this study, hydrogel electrolytes with immobilized pair ions are studied for the possibility of the flexible supercapacitors. One-pot copolymerization of 2-hydroxyethyl methacrylate (HEMA), [2-(acryloyloxy) ethyl] trimethylammonium chloride (META), 2-acrylamido-2-methyl-1-propanesulfonic acid sodium (AMPS) and crosslinker is employed to obtain five polymeric samples, increasing number with increasing HEMA. Fourier-transform infrared spectra confirm the reactions among HEMA, META and AMPS. Ionic conductivities of hydrogel electrolytes increase with increasing immobilized pair ions by electrochemical impedance. Raman spectra of ClO4 stretching can be split into free anions (FA), solvent separated ion pairs and contact ion pairs (CIP). Hydrogel electrolytes with more FA and less CIP possess the higher ionic conductivity. The compressive strength increases with increasing HEMA from dynamic mechanical analysis. HAS1, HAS4 and HAS5 sandwiched with electrodes are selected for electrochemical studies including electrochemical impedance, cyclic voltammetry, and galvanostatic charge/discharge. Among them, HAS4 covers the most requirements; possesses 64.8 mS cm−1 ionic conductivity, 65% compressive strain, and 0.45 MPa compressive strength. Therefore, HAS4 supercapacitor is chosen for cycle and bending tests. HAS4 supercapacitor has 96.3% capacitance retention after 5000 charge/discharge cycles at 2 A g−1. Under bending different angles, there is no significant loss for the capacitance of HAS4 supercapacitor.

原文English
文章編號232598
期刊Journal of Power Sources
558
DOIs
出版狀態Published - 2023 2月 28

All Science Journal Classification (ASJC) codes

  • 可再生能源、永續發展與環境
  • 能源工程與電力技術
  • 物理與理論化學
  • 電氣與電子工程

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