Effect of ionic conductivity in polymer-gel electrolytes containing iodine-based redox mediators for efficient, flexible energy storage systemsEffect of ionic conductivity in polymer-gel electrolytes containing iodine-based redox mediators for efficient, flexible energy storage systems
- Other Titles
- Effect of ionic conductivity in polymer-gel electrolytes containing iodine-based redox mediators for efficient, flexible energy storage systems
- Authors
- Park, Yeonsu; Choi, Hyeonggeun; Kim, Min-Cheol; Tran, Nguyen Anh Thu; Cho, Younghyun; Sohn, Jung Inn; Hong, John; Lee, Young-Woo
- Issue Date
- 25-Feb-2021
- Publisher
- 한국공업화학회
- Keywords
- Fiber-based supercapacitor; Redox mediator; Faradaic redox-reaction; Electrochemical energy storage; Ionic conductivity
- Citation
- Journal of Industrial and Engineering Chemistry, v.94, pp 384 - 389
- Pages
- 6
- Journal Title
- Journal of Industrial and Engineering Chemistry
- Volume
- 94
- Start Page
- 384
- End Page
- 389
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/2028
- DOI
- 10.1016/j.jiec.2020.11.009
- ISSN
- 1226-086X
1876-794X
- Abstract
- 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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