Biobased aqueous organic-based electrolyte in aqueous organic redox flow battery

A redox flow battery comprising at least one aqueous electrolyte comprising a fermented compound of formula (I)

• and/or an ion of compound (I),
• and/or a salt of compound (I),
• and/or a reduced form of the anthraquinone member of compound (I),
• wherein:
• X1, X2, X3, X4, X5, X6, X7 and X8 are independently selected from the group consisting of a hydrogen atom, a halogen atom, an ether group of formula —O-A′, a linear, cyclic or branched, saturated or unsaturated, optionally substituted, hydrocarbon group comprising from 1 to 10 carbon atoms, a OH group, a —R1 group and a —O-A-R1 group,
• A′ represents a linear, cyclic or branched, saturated or unsaturated, optionally substituted, hydrocarbon group comprising from 1 to 10 carbon atoms;
• A represents a linear, cyclic or branched, saturated or unsaturated, optionally substituted, hydrocarbon group comprising from 1 to 10 carbon atoms;
• R1 represents COOH, SO3H, or a salt thereof;
• wherein one to three of X1, X2, X3, X4, X5, X6, X7 and X8 is OH, and
• wherein one and only one of X1, X2, X3, X4, X5, X6, X7 and X8 is —O-A-R1.