期刊
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
卷 134, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jtice.2022.104285
关键词
bound water; zwitterionic; ionic conductivity; electrochemical window; speci fic capacitance; solid-state supercapacitor
资金
- Ministry of Science and Technology (MOST) [110-2221-E-006-025-MY3]
- Center of Applied Nanomedicine, National Cheng Kung University from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan
This study investigates the water retention effect on zwitterionic polymer electrolyte and finds that dehydration of saturated water leads to an increase in electrochemical window and the retention of bound water enhances the specific capacitance performance of solid-state supercapacitors.
Background: In the solid-state polymer electrolyte, the saturated water plays an role in increasing ionic conductivity but decreasing the electrochemical window. The water retention effect on zwitterionic polymer electrolyte is investigated in this study. Methods: Carboxylated chitosan (CCS) was subjected to oxa-Michael addition with sulfobetaine methacrylate (SBMA) to produce CCS-SBMA. Its structure was investigated by IR and 1H NMR and used the raman spectrum to observe three different types of water. CCS-SBMA electrolyte and carbon electrode were assembled into supercapacitor for electrochemical testing. Significant findings: CCS-SBMA was grafted 45.7% of sulfobetaine group via Nuclear Magnetic Resonance (NMR) spectra. During dehydration of saturated water from CCS-SBMA polymer electrolyte to 90% retention, the free water proportion decreased, and the bound water proportion increased via Raman spectra analysis. Accordingly, the electrochemical window increased from 1.6V to 2.05V with 10% dehydration of saturated water. Surprisingly, the supercapacitor performance with 90% water retention showed triple specific capacitance of 414.3F/g in comparison with 138.6F/g evaluated from galvanostatic charge-discharge analysis. In this study, CCS-SBMA bearing zwitterion was designed as polymer electrolyte to remain bound water proportion and enhance ion-dissociation during dehydration of saturated water for superior capacitance performance of solid-state supercapacitor. (c) 2022 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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