期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 168, 期 10, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac2759
关键词
Organic aqueous redox flow battey; Organic redox active molecule; Viologen; Methyl violgen; Nitrate; Counter anion
资金
- RD Program - NRF [2018M1A2A2063356, 2019M3D1A2104106]
- R&D Program - Ministry of Trade, Industry and Energy [20007882, 20007034]
- R&D Program - KIAT [P0009795]
- R&D Program - KIER of Republic of Korea [C0-5501-1, C1-2408]
Nitrate serves as a promising counter-anion for methyl viologen, leading to enhanced solubility and electrochemical reversibility, resulting in superior performance in aqueous redox flow batteries.
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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