Abstract: orous nickel oxides were prepared by hydrolysis and furtherheat treatment of nickel acetate in air at 300℃. An new type electrochemical capacitor system with
an asymmetric configuration was demonstrated. The nickel oxides prepared and active carbon wereapplied to the positive and negative electrodes respectively. These oxides can provide a specific capacitance of
240F/g, and maintain high utilization at high rates of discharge (i.e., high power density).The maximum operational voltage of the capacitor can be improved effectively and high power discharge attained.

Key words: nickel oxide, active carbon, electrochemical capacitor, supercapacitor, pseudocapci- tiance