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Organic Redox Flow Battery Materials [Battery Materials]

 Despite the advancements and increasing popularity in renewable energies, there remains a significant need for large-scale energy storage systems to fully actualize renewable energies on a national and global scale. Redox flow batteries (RFB) are suitable for the needs of large scale energy storage systems, particularly due to their safety and long duration cycling. A conventional RFB requires metal-based active materials such as vanadium; however, its potentially high cost and limited non-renewable availability is prohibitive. In order to address cost and renewability issues, organic redox flow battery (ORFB) which takes advantage of organic active materials have received increased attention.1-3) Within a ORFB system, two solutions of organic active materials are flowed and pumped into cell stacks from separate tanks, and the charge/discharge redox cycle occurs though porous separating membrane. The catholyte solution can include organic radical materials such as TEMPO,4) and metal complexes such as ferrocene,5) whereas the anolyte solution can include viologenes6) and quinones.7) These organic active materials are useful for RFB with aqueous solutions. Additionally, phenothiazines, quinoxalines,8-9) alkoxybenzenes and fluorenones10) are suitable for RFB using non-aqueous solutions.
Organic Redox Flow Battery

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