A π‐Conjugation Extended Viologen as a Two‐Electron Storage Anolyte for Total Organic Aqueous Redox Flow Batteries |
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Authors: | Dr Jian Luo Bo Hu Camden Debruler Prof?Dr Tianbiao Leo Liu |
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Institution: | Chemistry and Biochemistry, Utah State University, Logan, UT, USA |
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Abstract: | Extending the conjugation of viologen by a planar thiazolo5,4‐d]thiazole (TTz) framework and functionalizing the pyridinium with hydrophilic ammonium groups yielded a highly water‐soluble π‐conjugation extended viologen, 4,4′‐(thiazolo5,4‐d]thiazole‐2,5‐diyl)bis(1‐(3‐(trimethylammonio)propyl)pyridin‐1‐ium) tetrachloride, (NPr)2TTz]Cl4 , as a novel two‐electron storage anolyte for aqueous organic redox flow battery (AORFB) applications. Its physical and electrochemical properties were systematically investigated. Paired with 4‐trimethylammonium‐TEMPO (NMe‐TEMPO) as catholyte, (NPr)2TTz]Cl4 enables a 1.44 V AORFB with a theoretical energy density of 53.7 Wh L?1. A demonstrated (NPr)2TTz]Cl4 /NMe‐TEMPO AORFB delivered an energy efficiency of 70 % and 99.97 % capacity retention per cycle. |
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Keywords: | extended viologen molecular engineering redox flow battery TEMPO |
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