Redox Flow Batteries: Phenothiazine‐Based Organic Catholyte for High‐Capacity and Long‐Life Aqueous Redox Flow Batteries (Adv. Mater. 24/2019)

In article number 1901052, Yu Zhao, Guihua Yu, and co-workers explore a class of phenothiazine-derived molecules as catholytes for aqueous redox flow batteries. The highly delocalized conjugation of redox intermediate endows these molecules with pronounced structural stability. Flow cells based on methylene blue, a phenothiazine derivative, demonstrate a high capacity and unprecedented stability, validating its practicability for large-scale electrical energy storage.