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제125회 대한화학회 학술발표회 및 총회 Understanding electrochemical reduction of tetrabutylammonium tribromide ionic liquid and solid

등록일
2020년 2월 5일 19시 09분 57초
접수번호
0579
발표코드
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발표시간
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발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Yejin Choi, Jinho Chang1,*
Hanyang University, Korea
1Department of Chemistry, Hanyang University, Korea
Research in rechargeable batteries and electric double-layer capacitors (EDLCs) is converging to target systems that have battery-level energy density and capacitor-level cycling stability and power density. Rechargeable batteries using a Br-/Br2 redox reaction such as a Zn/Br redox flow battery (RFB) or EDLCs suffer from self-discharge reactions resulting in significant coulombic loss. To inhibit the self-discharge, quaternary ammonium (Q+) and tetraalkylammonium (T+) bromide are added to form ionic liquid (QBr2n+1) and solid (TBr3) polybromides during the energy storage system (ESS) charging process. Ionic solids are expected to prevent cross-diffusion more effectively than ionic liquids. In this article, we suggest the mechanism that deformation depending on whether tetrabutylammonium tribromide(TBr3) is ionic liquid or solid. In previous work, we revealed indirect electro-reduction(IDR) of quaternary ammonium polybromide(QBr2n+1) droplets. Unlike previous studies, we found the stochastic current spikes for electro-reduction of TBr3 through chronoamperometry, which are supposed to be evidence for direct electro-reduction (DR) of TBr3 ionic liquid and solid to Br- and T+ through their particle impact on Pt UME. The solid TBr3 is produced at low oxidation potential and the dissolution of solid needed low overpotential. Conversely, high overpotential is needed to dissolute TBr3 ionic liquid created at high oxidation potential. We reported why the overpotential required to eliminate ionic liquid and solid is different. And we revealed the electrochemical properties of ionic liquid or solid.

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