3D core/shell hierarchies of MnOOH ultrathin nanosheets grown on NiO nanosheet arrays for high-performance supercapacitors

A 3D core/shell configuration of dense MnOOH ultrathin nanosheets grown on porous NiO hierarchies as electrode material via a facile synthetic route exhibits high specific capacitance of 1625.3  F/g at a current density of 4 A/g with remarkable rate capability, excellent energy density (80.0  Wh/kg), as well as good cycling stability (105.7% of the initial capacitance after 5000 cycles).