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Effect of Ionic Conductivity in Polymer-Gel Electrolytes Containing Iodine-based Redox Mediators for Efficient, Flexible Energy Storage Systems
Journal of Industrial and Engineering Chemistry ( IF 5.9 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jiec.2020.11.009
Yeonsu Park , Hyeonggeun Choi , Min-Cheol Kim , Nguyen Anh Thu Tran , Younghyun Cho , Jung Inn Sohn , John Hong , Young-Woo Lee

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 μA, 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.

中文翻译:

离子电导率对含有碘基氧化还原介质的聚合物凝胶电解质的影响,用于高效、灵活的储能系统

摘要 定制氧化还原介质 (RM) 和开发系统制造方法以获得有利的电化学动力学对于提高纤维基超级电容器的储能性能至关重要。RMs的有效利用可以提供独特的储能机制;可以实现额外的法拉第氧化还原反应和优化的电极和电解质之间的离子扩散。在这里,我们使用碘基氧化还原介质 (I-RM) 碘化钾 (KI) 成功优化了纤维基超级电容器的电化学性能。基于纤维的对称纱线超级电容器电池 (f-SYCs),以 7.5 mM 的浓度加入 KI 介体,在 10 μA 的电流密度下表现出 13.9 mF 的高比电容,与之前报道的基于纤维的超级电容器相比,这直接描述了其优越的电化学性能。由于聚合物凝胶电解质中存在的水分含量有限,含有 I-RM 的 f-SYC 的电化学性能的改善归因于优化的离子电导率和扩散动力学,这是精心设计的 KI 电解质特性的结果。协同作用,结果表明控制聚合物凝胶电解质中 RM 的量对于在下一代纤维基超级电容器中实现优异的整体电化学性能至关重要。含有 I-RM 的 f-SYC 的电化学性能改善归因于优化的离子电导率和扩散动力学,这是精心设计的 KI 电解质特性的结果。协同作用,结果表明控制聚合物凝胶电解质中 RM 的量对于在下一代纤维基超级电容器中实现优异的整体电化学性能至关重要。含有 I-RM 的 f-SYC 的电化学性能改善归因于优化的离子电导率和扩散动力学,这是精心设计的 KI 电解质特性的结果。协同作用,结果表明控制聚合物凝胶电解质中 RM 的量对于在下一代纤维基超级电容器中实现优异的整体电化学性能至关重要。
更新日期:2021-02-01
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