Controlled synthesis of Ni0.25Co0.75(OH)(2) nanoplates and their electrochemical properties

Hexagonal Ni0.25Co0.75(OH)(2) nanoplates with rough and smooth surfaces have been synthesized with various amounts of CTAB by a mild wet chemical approach. The diameters of these two nanoplates are estimated to be similar to 150 nm and their thicknesses are similar to 30 nm. The electrochemical properties of the hexagonal nanoplates have also been investigated by using a three-electrode system under alkaline conditions. The scobinate Ni0.25Co0.75(OH)(2) nanoplates show enhanced supercapacitor capacity compared with the smooth samples. For scobinate nanoplates, the specific capacitance is 306 F g(-1) at a current density of 0.5 A g(-1) and remains 90% as the current density increases 16 times. At a current density of 3 A g(-1), the specific capacitance still remains 98% after 7000 cycles.