Redox flow battery is one of the prominent technologies for solving the intermittency during grid modernization with renewable energy. Aqueous organic redox flow batteries employing organic redox-active materials as electrolytes offer an environmentally benign, low cost, and versatile tunability towards better battery performance. Development of the electrolyte material has been focusing on a small palette of organic molecules that are known for their redox activity. Tremendous efforts are paid into the molecular design for material solubility, stability, redox potential, etc. We show how the molecular engineering of fluorenone activates redox activity in a molecule that is conventionally considered redox-inactive and revolutionary strategy to tune battery performance.

Reversible ketone hydrogenation and dehydrogenation for aqueous organic redox flow batteries

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