Methyl Viologen Anolyte Introducing Nitrate as Counter-Anion for an Aqueous Redox Flow Batteryopen access
- Authors
- Jang, Sang-Soon; Park, Se-Kook; Yeon, Sun-Hwa; Shin, Kyoung-Hee; Song, Haneul; Kim, Han-Su; Jung, Yoon-Seok; Jin, Chang-Soo
- Issue Date
- Oct-2021
- Publisher
- ELECTROCHEMICAL SOC INC
- Keywords
- Organic aqueous redox flow battey; Organic redox active molecule; Viologen; Methyl violgen; Nitrate; Counter anion
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.168, no.10, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 168
- Number
- 10
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/140799
- DOI
- 10.1149/1945-7111/ac2759
- ISSN
- 0013-4651
- Abstract
- Among the redox active molecules, methyl viologen (MV) is the most promising redox species in an aqueous organic redox flow battery, featuring the stable redox reaction MV2+/MV center dot+. Its electrochemical properties and solubility significantly depend on the counter-anion. Herein, we introduce the nitrate as a counter-anion to methyl viologen dication to obtain a new water-soluble methyl viologen compound (MVdN) and identify the effects of nitrate as counter-anion on electrochemical properties of methyl viologen. Nitrate leads to similar to 3.5 M solubility in water and good electrochemical reversibility (i(p,a)/i(p,c) = 0.79, Delta E = 54 mV) with fast mass transfer (D = 5.13 x 10(-5) cm(2)center dot s(-1)) of methyl viologen, which is superior to commonly used methyl viologen dichloride(MVdCl). Additionally, flow cell performance from 40 to 100 mA cm(-2) exhibited 99% coulombic efficiency and comparable performance with MVdCl. Nitrate could be a promising choice as a counter anion to methyl viologen as aqueous redox active molecule.
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