Self-healing and wide temperature tolerant flexible supercapacitor based on ternary-network organo-hydrogel electrolyte. (26th April 2023)

• Record Type: Journal Article
• Authors: Zheng, Hengyu; Du, XiaoJun; Liu, Qingxiao; Ou, KangTai; Cao, Yang; Fang, Xin; Fu, Qiang; Sun, Youyi
• Is Part Of: International journal of hydrogen energy. Volume 48:Number 35(2023)
• Page Start: 13264
• Page End: 13275
• Publication Date: 2023-04-26
• Subjects: Organo-hydrogel -- Graphene -- Wide temperature -- Supercapacitors -- Self-healing; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.12.223
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A novel ternary network organo-hydrogel electrolyte is developed to improve the environmental adaptability of flexible supercapacitors. The ternary network electrolyte is composed of graphene/boric acid/polyvinyl alcohol matrix and methyl sulfoxide/water/H2 SO4 mixture. A flexible supercapacitor with a sandwich structure is further assembled with the electrolyte and two polyaniline fiber/carbon cloth electrodes. The supercapacitor exhibits a high capacitance retention rate (90%) after 5 cutting/self-healing cycles. Furthermore, supercapacitors have high specific capacitance and capacitance retention on a wide temperature range of −65 °C–65 °C. The specific capacitance of supercapacitor is about 237.8 F/g and 152 F/g at 65 °C and −65 °C, in which the corresponding capacitance retention of supercapacitor is about 110.5% and 70.7%, respectively. The work provides an effective strategy to design and prepare flexible electrolyte with broad temperature adaptability, good self-healing ability and good mechanical flexibility for flexible energy storage devices. Highlights: A novel ternary network organo-hydrogel electrolyte is developed. The ternary network possesses broad temperature adaptability and self-healing ability. A self-healing and wide temperature tolerant flexible supercapacitor are developed.