Redox flow batteries (RFBs) are highly efficient electrochemical energy storage device for large-scale electricity generated from solar cells and wind turbines. Scalability and flexibility of RFBs improve the stability, efficiency and sustainability of power grid.1 RFBs work on the principle of reversible fuel cell and galvanic cell.2 Uniqueness of RFB is the decoupling of energy capacity and power density, which is not available with other existing conventional systems.3 Redox -active materials are key components in the RFB system because their physicochemical and electrochemical properties directly determine their battery performance and energy storage cost. In contrast to inorganic redox-active material, redox-active organic molecules are more promising candidate in the application of RFBs, due to their low cost, vast abundance and high tunability of both potential and solubility. Redox active organic quinones molecules are a class of potentially low cost, sustainable and high energy density electroactive materials for energy storage applications due to their large specific capacity, high redox reactivity and excellent electrochemical reversibility.4 A variety of quinones and their derivatives have been used as electroactive materials for applications including Li, Na, K and Zn ion batteries, supercapacitors (SCs), etc. Redox kinetics of quinone molecules mainly depend on solvent medium. Quinone molecule shows proton coupled electron transfer mechanism in aqueous medium where as in non-aqueous medium shows electron transfer reaction.5 In this seminar, research towards quinone based redox flow battery will be discussed.
REFERENCES:
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