A new aqueous all-organic flow battery with high cell voltage in acidic electrolytes

Aqueous organic redox-targeting flow battery based on Nernstian-potential-driven anodic redox-targeting reactions

“…2c). 38 To facilitate the SMRT reaction kinetics and reduce the voltage loss, we screened water-soluble redox molecules based on the requirements of SMRT for potential matching and a similarity of the molecular structure. A low-potential anthraquinone derivative, anthrafravic acid, was chosen here as a redox shuttle to target the ET1 reaction of TBPDO, which possessed a pair of reversible redox waves at À0.727 V vs. SHE in the alkaline electrolyte, rather close to that of ET1 of TBPDO (À0.714 V, Fig.…”

Future perspective on redox flow batteries: aqueous versus nonaqueous electrolytes

“…Solvent decompositions may also take place with its electrochemical window by their interactions with corresponding active species and electrolyte Stabilities and redox potentials. (a) Potential stability windows of various electrolytes potentially used in redox flow batteries (DMSO: dimethyl sulfoxide and ACN: acetonitrile) [16]; (b) the redox potentials of different active materials (inorganic and organic) in aqueous electrolytes (DHAQ: 1.8-dihydroxy-9,10-anthraquinone; FMN-Na: flavin mononucleotide sodium salt; BTMAP-Vi: bis (3-trimethylammonio) propyl viologen tetrachloride; AQDSDMS: anthraquinone-2,6-disulfonate dimethyl sulfide; ARS: 3,4-dihydroxy-9,10-anthraquinone-2-sulfonic acid; 2-AQS: anthraquinone-2sulfonic acid; 2，6-AQDS: anthraquinone-2,6-disulfonate; Fc: ferrocene; DP: dopamine, TEMPO: 2,2,6,6-tetramethyl-1-piperidinyloxy) [21]; (c) the redox potential of organic or organometallic active material in nonaqueous electrolytes (AQ: anthraquinone; NQ: naphthoquinone; BQ: benzoquinone; TCNQ: 7,7,8,8-tetracyanoquinodimethane; DBBB: di-tert-butyl-1,4-bis-(2-methoxyethoxy) benzene) [2].…”

Quinones for Aqueous Organic Redox Flow Battery: A Prospective on Redox Potential, Solubility, and Stability

“…Several research groups have demonstrated high energy dense efficient and stable performance of AORFBs in laboratory-scale devices. [26,27] Further research is ongoing to optimize the design and performance of AORFBs, with the aim of commercializing them for use in large-scale energy storage applications. Although energy density does not matter much in case of flow batteries as they are preferentially being used for stationary applications.…”