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  • 09월 20일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제126회 대한화학회 학술발표회 및 총회 Nano-confinement effects on enhanced reversibility of redox reactions coupled with an irreversible chemical process by electrolysis acceleration in nanoporous carbon electrodes for redox-enhanced electrochemical capacitor

등록일
2020년 9월 17일 16시 33분 01초
접수번호
1172
발표코드
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발표시간
화 10시 : 30분
발표형식
구두발표
발표분야
Electrochemistry - Oral Presentation of Young Scholars in Electrochemistry
저자 및
공동저자
Jaehyun Jeon, Jinho Chang*
Department of Chemistry, Hanyang University, Korea

Redox-enhanced electrochemical capacitors (Redox-ECs) in which electrons are stored and released by redox reactions of organic molecules either dissolved in an electrolyte or adsorbed on an electrode surface represent a promising energy storage system with electrochemical characteristics of both rechargeable batteries and electrical double-layer capacitors. However, the choices for redox-active molecules in Redox-ECs are often limited due to an irreversible nature induced by chemical processes, such as hydrolysis, coupled with e−-transfer reactions. Here, we describe the effects of nanoconfinement on enhanced reversibility in the redox reaction of an electroactive organic molecule undergoing irreversible hydrolysis after e−-transfer in a nanoporous carbon electrode. The redox reaction between hydrated rhodizonic acid (RDZ·2H2O) and hexahydroxybenzene (HHB) via tetrahydroxy-1,4-benzoquinone served as a model in which RDZ is irreversibly hydrolyzed to RDZ·2H2O. This phenomenon results from electrolysis acceleration within confined nanoregimes in a porous carbon matrix, which is analyzed by finite-element analysis. We built asymmetric ECs composed of nanoporous carbon electrodes, one of which was coated with RDZ·2H2O. Due to the enhanced reversibility of the RDZ·2H2O/HHB redox reaction in a nanoporous carbon electrode, Coulombic efficiency of the cell remained near 90% despite the irreversible nature of RDZ via hydrolysis. This research provides fundamental insights into the use of organic molecules in energy storage using redox electrolytes such as Redox-ECs and organic redox flow batteries.


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