期刊
ACS ENERGY LETTERS
卷 6, 期 8, 页码 2891-2897出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c01146
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资金
- National Science Foundation (Career Award) [1847674]
- Utah State University
- NSF's MRI program [1429195]
This study introduces methyl viologen dibromide ([MV]Br-2) as a new type of redox electrolyte material for pH-neutral redox flow batteries, showcasing its efficient bromine complexing ability.
Aqueous organic redox flow batteries (AORFBs) have become increasingly attractive for scalable energy storage. However, it remains challenging to develop high-voltage, powerful AORFBs because of the lack of a high redox potential catholyte. Herein, we report methyl viologen dibromide ([MV]Br-2) as a facile self-trapping, bipolar redox electrolyte material for pH-neutral redox flow battery applications, representing the first report of methyl viologen as a highly efficient bromine complexing reagent. The formation of the [MV](Br-3)(2) complex was computationally predicted and experimentally confirmed. The low-solubility [MV](Br-3)(2) complex in the catholyte during the battery charge process not only mitigates the crossover of charged tribromide species (Br-3(-)) but also addresses the toxicity concern of volatile bromine simultaneously. A 1.53 V bipolar MV/Br AORFB (10.2 Wh/L) delivered stable battery performance at pH-neutral conditions, specifically, 100% total capacity retention, 133 mW/cm power density, and 56% energy efficiency at 60 mA/cm(2).
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