Facilitated Self‐Adjusting Mechanism with Mn2+ Additive in Electrolyte for Ammonium‐Ion Hybrid Supercapacitors

Ammonium-ion hybrid supercapacitors (AIHSCs) have gained extensive attention due to their high safety and environmental friendliness. Manganese oxides are among the most promising cathode materials; however, the side electrochemical reactions occurring in aqueous electrolytes limit their reversible capacities and energy densities. This work prepares the β-/γ-MnO