Electroactive Materials Next-Generation Redox Flow Batteries

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Electroactive Materials Next-Generation Redox Flow Batteries ( electroactive-materials-next-generation-redox-flow-batteries )

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fundamental research, and not mature for practical applications due to the slow redox kinetics (45), low Coulombic efficiency (46), or parasitic oxygen/hydrogen evolution reactions (10). Organic Redox-Active Materials Recently, organic redox-active materials have emerged as promising candidates for RFBs. The organic redox-active materials possess great advantages, such as molecular diversity, structural designability, and low cost. The comparison between inorganic RFBs and organic RFBs are shown in Table 1. Up to now, several types of organic redox-active materials have been studied in RFBs. In this subsection, the established structure-function relationships and degradation mechanisms of organic redox-active materials are reviewed. Table 1. The comparison of inorganic and organic RFBs. Principle of Function-Oriented Molecular Design Molecular engineering is a versatile strategy to fine tune the properties of organic redox materials, including: (1) Solubility. Many electroneutral, non-polar electroactive materials have limited solutiblity in aqueous media. However, the incorporation of polar functional substituents, such as hydroxy (-OH), sulfonate (-SO3Na), amine (-NH2), carboxylate (-COONa), phosphonate 6 Qin and Fan; Clean Energy Materials ACS Symposium Series; American Chemical Society: Washington, DC, 2020.

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