期刊
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
卷 94, 期 -, 页码 384-389出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2020.11.009
关键词
Fiber-based supercapacitor; Redox mediator; Faradaic redox-reaction; Electrochemical energy storage; Ionic conductivity
资金
- Soonchunhyang University Research Fund
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea [20184030202130]
Tailoring redox-mediators and utilizing iodine-based redox mediator have been shown to improve the energy storage performance of fiber-based supercapacitors. By optimizing the concentration of the mediator and electrolyte properties, excellent electrochemical performance can be achieved in the next-generation fiber-based supercapacitors.
Tailoring redox-mediators (RMs) and developing systematic fabrication methods for favorable electrochemical kinetics are essential to improve the energy storage performance of fiber-based supercapacitors. The effective use of RMs can provide a unique energy storage mechanism; additional Faradaic redox reactions and optimized ion diffusion between the electrodes and electrolyte can be achieved. Here, we successfully optimized the electrochemical performance of fiber-based supercapacitors using the iodine-based redox mediator (I-RM) potassium iodide (KI). The fiber-based symmetrically yarned supercapacitor cells (f-SYCs), incorporating the KI mediator at a concentration of 7.5 mM, exhibit a high specific capacitance of 13.9 mF at a current density of 10 mu A, which directly depicts its superior electrochemical performance compared to that of the previously reported fiber-based supercapacitors. Owing to the limited moisture content present in the polymer-gel electrolyte, the improved electrochemical performance of the f-SYCs containing I-RMs is attributed to the optimized ionic conductivity and diffusion kinetics, as a result of the well-engineered KI electrolyte properties. Synergistically, the results indicate that controlling the amount of RMs in the polymer-gel electrolyte is crucial to achieve excellent overall electrochemical properties in next-generation fiber-based supercapacitors. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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