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SCI Article

Viologen-Bromide Dual-Redox Ionic Solid Complexes: Understanding Their Electrochemical Formation and
성명 장진호()
소속 자연과학대학 화학과
캠퍼스
우수선정주 2019년 12월 3째주
Author 정회일 (Dept Chem) corresponding author; 장진호 (Dept Chem) corresponding author;
Corresponding Author Info Chung, H; Chang, J (reprint author), Hanyang Univ, Dept Chem, 222 Wangsimni Ro, Seoul 04763, South Korea.
E-mail 이메일 아이콘jhcechem@hanyang.ac.kr
Document Type Article
Source ACS APPLIED MATERIALS & INTERFACES Volume:11 Issue:46 Pages:43659-43670 Published:2019
Times Cited 0
External Information http://dx.doi.org/10.1021/acsami.9b13985
Abstract The inhibition of self-discharge in a redox-enhanced electrochemical capacitor (Redox-EC) is crucial for excellent energy retention. Heptyl viologen dibromide (HVBr2) was chosen as a strong candidate of a dual-redox species in Redox-EC due to its solid complexations during the charging process, at which HV2+ is electrochemically reduced to HV+center dot and form a solid complex, [HV+center dot center dot Br-], on an anode while Br- is electro-oxidized to Br-3(-) and renders [HV2+center dot 2Br(3)(-)] on a cathode. The solid complexes could not transfer across the separator, resulting in significant diminution of the self-discharge. In this Article, we present detailed electrochemical studies of formation of [HV2+center dot 2Br(3)(-)] and [HV+center dot center dot Br-], their redox features, and galvanic exchange reactions between the two types of dual-redox ionic solids on a Pt ultra-microelectrode (UME) in neutral (0.33 M Na2SO4) and acidic (1 M H2SO4) solutions. Most importantly, through voltammetric and particle-impact electrochemical analyses, we found that the redox and galvanic exchange reactions of the two dual-redox ionic solid complexes involve H+ transfer, which is the key process to limit the overall kinetics of the electrochemical reactions. We also rationalize the proton-accompanied galvanic exchange reaction based on computational simulation.
Web of Science Categories Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
Funding National Research Foundation of Korea (NRF) - Bio & Medical Technology Development Program [2017M3A9G8084539]; NRF - Ministry of Education [2018R1D1A1B07044990]; Korea Research Fellowship program - Ministry of Science and ICT through the National Research
Language English
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