Asymmetric supercapacitors with dominant pseudocapacitance based on manganese oxide nanoflowers in a neutral aqueous electrolyte

Abstract

Unique MnO₂ nanoflowers (∼25 nm) composed of ultrathin K_0.26MnO₂ nanoflake assemblies were synthesized by a facile and green procedure. Prototype MnO₂-NFs//KCl//CNTs asymmetric supercapacitors in a neutral aqueous electrolyte demonstrated pseudocapacitive dominance for the first time in addition to outstanding energy and power densities and superior cycling performance.