Understanding the role of Br- during the electrooxidation of I- in aqueous media: I2Br-(aq)-formation without the precipitation of an iodine film
- Authors
- Park, Cheolmin; Chang, Jin ho
- Issue Date
- Dec-2021
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- I2; Br-; I-3(-)(aq); I-(aq) redox reaction; iodine film; rotating ring-disk electrode; Zn-polyiodide redox flow battery
- Citation
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.42, no.12, pp.1678 - 1685
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY
- Volume
- 42
- Number
- 12
- Start Page
- 1678
- End Page
- 1685
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/190572
- DOI
- 10.1002/bkcs.12406
- ISSN
- 0253-2964
- Abstract
- Zn-polyiodide redox flow battery is considered to be promising energy storage systems. However, the rate of the I-3(-)(aq)/I-(aq) half redox reaction could be limited by a metastable iodine film in aqueous solutions. In this article, we found that the addition of Br- could inhibit the formation of an iodine film (I-2-F) and form soluble I2Br-(aq) during the electrooxidation of I-. I- was electrochemically oxidized to the soluble form I-3(-)(aq). The depletion of I-(aq) and an increase of I-3(-)(aq) would lead to the formation of I-2 and form I-2-F. Then, under a steady state, I-(aq) was electrochemically oxidized to I-3(-)(aq) via I-2-F. However, the reaction pathway for the electrooxidation of I- was significantly altered by the addition of Br-. I- was electrochemically oxidized to I-3(-)(aq) and was further oxidized to I2Br-(aq) without the formation of I-2-F. Moreover, we estimated the stability constant of I2Br-(aq) and consequently the fractional diagrams of I-2(aq), I-3(-)(aq), and I2Br-(aq) existing in a solution with both I- and Br- during the electrooxidation of I-, providing the necessity of a highly concentrated Br- condition in the vicinity of an electrode to form I2Br-(aq) as the main iodine species through the electrooxidation of I-.
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