A new approach to high-performance flexible supercapacitors: Mesoporous three-dimensional Ni-electrodes

The highly meso-porous 3D-Ni electrode provides a large number of active sites to store charges and provide good accessibility to the ions in electrolytes, leading to excellent electrochemical performance. The Ni(OH)2/3D-Ni electrode showed an outstanding specific capacitance of ~3400 F/g at 10 A/g and retained 80% of the initial capacitance at 200 A/g. The flexible hybrid supercapacitor delivered an excellent energy density of 75 Wh/kg and a high power density of 5.3 kW/kg.176