Cyano‐Substituted Phenazine Derivative as a High‐Performance Organic Anode for Aqueous Proton Batteries

Proton batteries have attracted increasing attention as a promising energy storage technology owing to their environmental friendliness, resource abundance, and intrinsic safety. However, the performance of conventional proton batteries is restricted by the limitations of electrode materials in a single pH environment, making it difficult to simultaneously achieve high capacity and long cycle stability. In this study, an organic anode material with high capacity in alkaline electrolyte was successfully developed through systematic screening. The reversible proton storage mechanism was elucidated by in situ infrared spectroscopy. Furthermore, a novel pH‐decoupled battery was constructed by employing a bipolar membrane, enabling the efficient cooperation of the organic anode in alkaline electrolyte with a cathode in acidic electrolyte. The pH‐decoupled battery delivers a high operating voltage of 1.6 V and an energy density of 48 Wh kg −1 based on active electrode materials), thus overcoming the intrinsic limitations of traditional aqueous batteries, providing new design strategies and technical pathways for the development of high‐performance proton batteries.