Polyaniline/Tungsten Trioxide Organic-Inorganic Hybrid Anode for Aqueous Proton Batteries

Aqueous proton batteries have received increasing attention due to their outstanding rate performance, stability and high capacity. However, the selection of anode materials in strongly acidic electrolytes poses a challenge in achieving high-performance aqueous proton batteries. This study optimized the proton reaction kinetics of layered metal oxide WO₃ by introducing interlayer structural water and coating polyaniline (PANI) on its surface to prepare organic-inorganic hybrid material (WO₃ ⋅ 2H₂O@PANI). We constructed an aqueous proton battery with WO₃ ⋅ 2H₂O@PANI anode and MnO₂@GF cathode. After 1500 cycles at a current density of 10 A g^-1, the capacity retention rate can still reach 80.2 %. These results can inspire the development of new aqueous proton batteries.