Time Transient Electrochemical Monitoring of Tetraalkylammonium Polybromide Solid Particle Formation: Observation of Ionic Liquid-to-Solid Transitions

Yejin Choi, Jiseon Hwang, Kyung Mi Kim, Saibal Jana, Sang Uck Lee, Junghyun Chae, Jinho Chang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Energy storage systems (ESSs) using a Br - /Br 2 redox reaction such as a Zn/Br redox flow battery (RFB) or a redox-enhanced electrochemical capacitor (Redox-EC) 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 (QBr 2n+1 ) and solid (TBr 3 ) polybromides during the ESS charging process. The electrochemical formation of liquid QBr 2n+1 and its electrochemical properties have been examined. The detailed mechanisms of ionic solid TBr 3 formation, however, have not yet been explored. In this article, we analyzed the ionic liquid-to-solid phase transition of TBr 3 particles using a time transient electrochemical method. We suggest the formation of ionic solid TBr 3 particles via hydrated TBr 3 droplets as an intermediate phase, which are generated by electro-oxidation of Br - in an aqueous TBr solution. We found the phase transition time of TBr 3 particles is strongly dependent on the chemical structure of T + and the concentration of TBr in an aqueous solution.

Original languageEnglish
Pages (from-to)5850-5857
Number of pages8
JournalAnalytical Chemistry
Volume91
Issue number9
DOIs
StatePublished - 2019 May 7

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Ionic Liquids
Monitoring
Energy storage
Phase transitions
Electrooxidation
Redox reactions
Bromides
Electrochemical properties
Ammonium Compounds
Capacitors
Liquids
QBr

Cite this

Choi, Yejin ; Hwang, Jiseon ; Kim, Kyung Mi ; Jana, Saibal ; Lee, Sang Uck ; Chae, Junghyun ; Chang, Jinho. / Time Transient Electrochemical Monitoring of Tetraalkylammonium Polybromide Solid Particle Formation : Observation of Ionic Liquid-to-Solid Transitions. In: Analytical Chemistry. 2019 ; Vol. 91, No. 9. pp. 5850-5857.
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abstract = "Energy storage systems (ESSs) using a Br - /Br 2 redox reaction such as a Zn/Br redox flow battery (RFB) or a redox-enhanced electrochemical capacitor (Redox-EC) 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 (QBr 2n+1 ) and solid (TBr 3 ) polybromides during the ESS charging process. The electrochemical formation of liquid QBr 2n+1 and its electrochemical properties have been examined. The detailed mechanisms of ionic solid TBr 3 formation, however, have not yet been explored. In this article, we analyzed the ionic liquid-to-solid phase transition of TBr 3 particles using a time transient electrochemical method. We suggest the formation of ionic solid TBr 3 particles via hydrated TBr 3 droplets as an intermediate phase, which are generated by electro-oxidation of Br - in an aqueous TBr solution. We found the phase transition time of TBr 3 particles is strongly dependent on the chemical structure of T + and the concentration of TBr in an aqueous solution.",
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Time Transient Electrochemical Monitoring of Tetraalkylammonium Polybromide Solid Particle Formation : Observation of Ionic Liquid-to-Solid Transitions. / Choi, Yejin; Hwang, Jiseon; Kim, Kyung Mi; Jana, Saibal; Lee, Sang Uck; Chae, Junghyun; Chang, Jinho.

In: Analytical Chemistry, Vol. 91, No. 9, 07.05.2019, p. 5850-5857.

Research output: Contribution to journalArticle

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AU - Chang, Jinho

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