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- W4200211880 abstract "Abstract Aqueous organic redox flow batteries (AORFBs) are highly attractive for large‐scale energy storage because of their nonflammability, low cost, and sustainability. (2,2,6,6‐Tetramethylpiperidin‐1‐yl)oxyl (TEMPO) derivatives, a class of redox active molecules bearing air‐stable free nitroxyl radicals and high redox potential (>0.8 V vs NHE), has been identified as promising catholytes for AORFBs. However, reported TEMPO based molecules are either permeable through ion exchange membranes or not chemically stable enough for long‐term energy storage. Herein, a new TEMPO derivative functionalized with a dual‐ammonium dicationic group, N 1 , N 1 , N 1 , N 3 , N 3 , 2, 2, 6, 6‐nonamethyl‐ N 3 ‐(piperidinyloxy)propane‐1,3‐bis(ammonium) dichloride ( N 2 ‐TEMPO ) as a stable, low permeable catholyte for AORFBs is reported. Ultraviolet–visible (UV–vis) and proton nuclear magnetic resonance ( 1 H‐NMR) spectroscopic studies reveal its exceptional stability and ultra‐low permeability (1.49 × 10 −12 cm 2 s −1 ). Coupled with 1,1′‐bis[3‐(trimethylammonio)propyl]‐4,4′‐bipyridinium tetrachloride ((NPr) 2 V) as an anolyte, a 1.35 V N 2 ‐TEMPO /(NPr) 2 V AORFB with 0.5 m electrolytes (9.05 Wh L −1 ) delivers a high power density of 114 mW cm −2 and 100% capacity retention for 400 cycles at 60 mA cm −2 . At 1.0 m electrolyte concentrations, the N 2 ‐TEMPO /(NPr) 2 V AORFB achieves an energy density of 18.1 Wh L −1 and capacity retention of 90% for 400 cycles at 60 mA cm −2 ." @default.
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- W4200211880 date "2021-12-18" @default.
- W4200211880 modified "2023-10-16" @default.
- W4200211880 title "A Stable, Low Permeable TEMPO Catholyte for Aqueous Total Organic Redox Flow Batteries" @default.
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- W4200211880 doi "https://doi.org/10.1002/aenm.202102577" @default.
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