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Aqueous organic redox flow batteries (AORFBs) have gained increased interest as a promising solution to store energy from sustainable energy sources. Inspired by naturally occurring bio‐quinones, we here propose a new electrolyte based on the fungal compound phoenicin. Phoenicin was produced using the filamentous fungus Penicillium atrosanguineum at a concentration of 1.24 g L−1 liquid medium and extracted using ethyl acetate to a purity exceeding 95 %. The fungus may provide a benefit of high scalability of the biosynthesis‐based production of the electroactive substance. Here, we demonstrate the performance of biologically produced phoenicin as a negative electrolyte in an RFB against ferro/ferricyanide, as a proof of concept, giving an initial capacity of 11.75 Ah L−1 and a capacity decay of 2.85 % day−1. For a deeper investigation of the battery setup, in situ attenuated total reflection infrared (ATR‐IR) spectra of the phoenicin electrolyte were recorded. Symmetric cell cycling was performed to study the stability of this bio‐based active material. [ABSTRACT FROM AUTHOR]

Aqueous redox flow batteries, energy storage, filamentous fungi, natural products, quinones Keywords: aqueous redox flow batteries; energy storage; filamentous fungi; natural products; quinones EN aqueous redox flow batteries energy storage filamentous fungi natural products quinones 1 1 1 01/11/23 20230101 NES 230101 B The Cover Feature b illustrates a redox flow battery based on the fungal pigment phoenicin, which was produced and extracted from I Penicillium atrosanguineum i . [Extracted from the article]