Enabling Durable and High‐Energy Aqueous Proton Batteries by Engineering a Robust Polymer‐Metal Complex Interphase on Mn 2 O 3 Cathode

(based on the total mass of cathode and anode). These findings offer a promising cathode material for proton batteries and a cost-effective approach to optimizing the cathode performance in acidic electrolytes, thereby paving the way for the development of a durable, high-energy proton battery.