Hydrated Proton Desolvation Optimization Toward High‐Rate Aqueous Proton Batteries

Abstract Proton batteries, renowned for the rapid migration of charge carriers, are expected to integrate high power and energy density. Among candidate materials, molybdenum oxide demonstrates promising specific capacity but suffers from compromised rate performance caused by the sluggish complete desolvation kinetics of hydrated proton at the interface. This work demonstrates a hydrated proton desolvation optimization strategy for high‐rate proton batteries in molybdenum oxide by trace phosphorus doping (P‐MoO _x ). The P‐MoO _x delivers remarkable rate capability (≈200 mAh g ⁻¹ at 200 A g ⁻¹ , ≈80% of the capacity obtained at 2 A g ⁻¹ ) and long lifespan over 58 000 cycles, significantly outperforming previously reported proton storage electrodes, e.g., organic complex, hydrate compound, and metal oxide. This superior performance is attributed to the weak interaction between P‐MoO _x and hydrated proton, which enables an energetically and kinetically favorable incomplete desolvation process at the interface, facilitating the fast storage of hydronium. Furthermore, scalable integration of P‐MoO _x based proton micro‐batteries, arranged in a 7 × 10 series‐parallel configuration, exhibits a high voltage of 10 V with on‐demand customization capacity. This study highlights the critical role of desolvation process for designing high‐rate electrode, and hopefully advance the progress of fast‐charging batteries.