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Elaborating iodide redox chemistry for high-performance aqueous redox-enhanced electrochemical capacitors : comparative study of ammonium and potassium counterion effects

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Abstract
Low energy density of aqueous-based electrochemical capacitors has been a major obstacle to their commercialization. To alleviate this drawback, electrolytes with soluble redox-active molecules are utilized to enhance energy density. Redox-enhanced electrochemical capacitors (redox ECs) are promising as they convert the ‘inert’ electrolyte of a conventional EDLC into an active element for charge storage. Iodide is a promising aqueous redox-active species as it is inexpensive, electrochemically reversible redox couples with high solubility. In this work, to better utilize iodide as catholyte, comparative research of NH4+ vs K+ effect including solvation structure on iodide is carried out for redox EC system. With NH4+ that produces a stronger cation-water interaction due to hydrogen bonding, the size of iodide solvation shell is reduced compared to that with K+. This solvation environment facilitates the mass transport of iodide to the electrode and subsequently enhance the energy and power density performances in redox ECs. This study deals with not only energy enhancement of supercapacitor, but also propose a simple strategy to optimize redox kinetics that further improves energy density of redox ECs.
Author(s)
Subin Lee
Issued Date
2023
Type
Thesis
URI
https://scholar.gist.ac.kr/handle/local/19229
Alternative Author(s)
이수빈
Department
대학원 신소재공학부
Advisor
Yoo, Seung Joon
Degree
Master
Appears in Collections:
Department of Materials Science and Engineering > 3. Theses(Master)
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