期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 6, 页码 2409-2415出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b06164
关键词
flexible energy storage system; redox mediator; potassium iodide; water-proofed function; supercapacitor
资金
- National Research Foundation of Korea - Korea government (MSIT) [2019R1F1A1041407, 2019M1A2A2065616, 2019R1A4A1021237, 2019R1A2C1007883]
- Soonchunhyang University Research Fund
- National Research Foundation of Korea [2019R1A2C1007883, 2019M1A2A2065616, 2019R1A4A1021237, 2019R1F1A1041407] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Flexible supercapacitors based on electrostatic double-layer capacitors as next-generation energy storage systems hold great promise for wearable and flexible electronic devices owing to their high flexibility and electrochemical cyclability. However, the challenge of low charge-storing ability still remains, as electronic devices require a high charge storage capability. As one of the advanced strategies for enhancing charge-storing ability in flexible supercapacitors, the introduction of a redox mediator (RM) into a gel electrolyte has recently attracted great interest. Here, we present a fiber-based flexible energy storage system (f-FESS) integrated with iodine-based chemical species as a novel RM, carbon fiber-based electrodes, and a solid-state polymer-gel electrolyte so as to enhance the charge storage capability of flexible supercapacitors. The as-prepared fFESS-RM exhibits enhanced charge storage capabilities of up to 461.8 F L-1 and 64.14 mWh L-1, which are 3.6 times higher than those of f-FESS without RM. The enhanced capacitive properties of f-FESS-RM are attributed to their additional Faradic redox reaction of iodine-based chemical species in the electrolyte as well as electrical double-layer capacitive behavior. Also, the f-FESS-RM shows remarkably superior mechanical robustness under various bending, winding, knotting, and weaving conditions. Furthermore, we have demonstrated that the f-FESS-RM is stably workable under deionized water and base electrolytes. In combination, these outcomes provide a novel advanced strategy to enhance the charge-storing ability with strong mechanical robustness in flexible supercapacitors.
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