Naphthalene diimide as a two-electron anolyte for aqueous and neutral pH redox flow batteries

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Developing organic materials that show stable and highly reversible redox-activity is a key challenge for achieving cost-effective and sustainable aqueous redox flow batteries (RFBs) for practical energy storage applications. We report a water-soluble naphthalene diimide (NDI) derivative using carboxylate groups, which was tested and established as a new class of versatile anolytes capable of storing two electrons in a single molecule in aqueous and neutral pH RFBs. The potassium salt ofN,N '-bis(glycinyl)naphthalene diimide [K-2-BNDI] showed reversible and stable two-electron reductions accompanied by ion- pairing. A prototype aqueous RFB consisting of [K-2-BNDI] and 4-OH-TEMPO was constructed and showed excellent cyclability, high energy and voltage efficiencies. This study suggests a versatile way of designing new anolytes inspired by organic semiconductors that operate in a multi-electron redox mode.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2020-06
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.8, no.22, pp.11218 - 11223

ISSN
2050-7488
DOI
10.1039/d0ta01160f
URI
http://hdl.handle.net/10203/275604
Appears in Collection
CH-Journal Papers(저널논문)
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