期刊
ACS ENERGY LETTERS
卷 2, 期 5, 页码 1156-1161出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00261
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资金
- Joint Center for Energy Storage Research (JCESR), an Energy Innovation Hub - U.S. Department of Energy, Office of Science, Basic Energy Sciences
- William R. Wiley Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility - DOE's Office of Biological and Environmental Research
- DOE [DE-AC05-76RL01830]
Redox-active organic materials (ROMs) have shown great promise for redox flow battery applications but generally encounter limited cycling efficiency and stability at relevant redox material concentrations in nonaqueous systems. Here we report a new heterocyclic organic anolyte molecule, 2,1,3-benzothiadiazole, that has high solubility, a low redox potential, and fast electrochemical kinetics. Coupling it with a benchmark catholyte ROM, the nonaqueous organic flow battery demonstrated significant improvement in cyclable redox material concentrations and cell efficiencies compared to the state-of-the-art nonaqueous systems. Especially, this system produced exceeding cyclability with relatively stable efficiencies and capacities at high ROM concentrations (>0.5 M), which is ascribed to the highly delocalized charge densities in the radical anions of 2,1,3-benzothiadiazole, leading to good chemical stability. This material development represents significant progress toward promising next-generation energy storage.
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