Redox flow batteries for energy storage: Recent advances in using organic active materials

The development of redox electrolytes using organic active materials as alternatives to metal-based species for redox flow batteries is booming recently. However, challenges and gaps remain toward commercialization. This review briefly discusses the most recent advances of using electroactive organic materials. Strategies such as chemical modification through molecular engineering and new efforts toward energy-rich electrolytes and high-power electrolytes are addressed. Furthermore, the limiting factors governing the cycling life are summarized.