Preparation and Electrochemical Capacitance of Amorphous Nickel Oxide by Micro-emulsion

NiO was obtained by annealing amorphous Ni(OH)(2) precursor that synthesized by micro-emulsion. The morphology, structure and performance of the precursor and product were characterized by TEM, XRD, TG and DSC. The results showed that the morphology of NiO was also amorphous. The activation energy for nanocrystallite growth was 10.72 kJ . mol(-1) below 600 degrees C, indicated that NiO grew primarily by means of interfacial reaction. The capacitance performances of AC/NiO hybrid capacitor were researched by galvanostatic charge/discharge, cyclic voltammeter and electrochemical impedance spectroscopy. The results indicated that the specific capacitance, power and energy of AC/NiO hybrid capacitor were 104.4 F.g(-1), 75 W.kg(-1) and 65.3 Wh.kg(-1) at the current density of 100 mA . g(-1) respectively. The capacity retention was 87.7% after 200 cycles. AC/NiO hybrid capacitor exhibited excellent capacitance performance with the potential range from 0 to 1.5 V.