Application of spherical Ni(OH)2/CNTs composite electrode in FP asymmetric supercapacitor

The composite electrodes consisting of carbon nanotubes and spherical Ni(OH)(2) are developed by mixing nickel hydroxide, carbon nanotubes and carbonyl nickel powder together in 8:1:1 ratio. A maximum capacitance of 311 F/g is obtained for an electrode prepared with the precipitation process. In order to enhance energy density, an asymmetric type pseudo-capacitor/electric double layer capacitor is considered and its electrochemical properties are investigated. Values for the specific energy and maximum specific power of 25.8 W(.)h/kg and 2.8 kW/kg, respectively, are demonstrated for a cell voltage between 0 and 1.6 V. By using the modified cathode of a Ni(OH)(2)/carbon nanotube composite electrode, the asymmetric supercapacitor exhibits high energy density and stable power characteristics.