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Understanding the mass-transfer of Br species in an aqueous and quaternary ammonium polybromide biphasic system via particle-impact electrochemical analysis

Title
Understanding the mass-transfer of Br species in an aqueous and quaternary ammonium polybromide biphasic system via particle-impact electrochemical analysis
Author
장진호
Keywords
Zn-Br redox flow battery; Quaternary ammonium bromide; Self-discharge; Particle impact electrochemistry; Mass transfer; Migration
Issue Date
2019-12
Publisher
ELSEVIER SCIENCE INC
Citation
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, v. 80, page. 535-544
Abstract
In this article, we present our studies on the mass-transfer of Br species existing in an acidic aqueous solution containing quaternary ammonium bromide (QBr) during electro-oxidation of Br-. We found that the mass-transfer of quaternary ammonium polybromide (QBr(2n)(+1)) droplets toward a Pt ultra-microelectrode (UME) are mainly governed by diffusion, although their migration is not negligible. We further revealed that the migration of Br- in a QBr(2n)(+1) droplet significantly affects the current associated with the electro-oxidation of Br- during the collision of the droplet on a Pt UME. Finally, we observed current spikes in which the current decayed and reached a certain steady state with a non-zero value. These were interpreted based on Br--transfer at the interface between water and a QBr(2n)(+1) droplet (water vertical bar QBr(2n+1)) using finite element analysis. The presented electrochemical analyses would be potentially important to understand the operating mechanism of redox flow batteries (RFBs) using Br-/Br-2 as a half redox reaction to inhibit the self-discharge that occurs during the charging process. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S1226086X19304290?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/156514
ISSN
1226-086X; 1876-794X
DOI
10.1016/j.jiec.2019.08.028
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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