Nanostructured Manganese Dioxide for Hybrid Supercapacitor Electrodes

Hybrid supercapacitors, as emerging energy storage devices, have gained much attention in recent years due to their high density, fast charge/discharge and long cyclabilities. Among the wide range of systems covered by this topic, low cost, environmental friendliness power provide MnO2 with great characteristics be a competitive candidate. The present work reports hybrid aqueous supercapacitor system using commercial activated carbon negative electrode synthesized manganese dioxide positive electrode. Two polymorphs (?-MnO2 ?-MnO2) were tested different neutral basic electrolytes. In way, full cell that reached an density 15.6 Wh kg?1 at 1 kW achieved. electrode–electrolyte combination explored study exhibits excellent performance without losing capacity after 5000 cycles, leading promising approach towards more sustainable, high-performance systems.