The development of carbon nanotubes/RuO2 center dot xH(2)O electrodes for electrochemical capacitors

Carbon nanotubes were refluxed with nitric acid to create acid sites on the surface. After such treatment, amorphous or nano-scale crystalline RuO2. x H(2)O can be adhered to the surfaces of carbon nanotubes by a simple method . RuO2. xH(2)O became more amorphous with decreasing the fraction of carbon nanotubes. The capacitance can be enhanced significantly by the adherence. When the weight fraction of RuO2. xH(2)O in the composite electrodes reach ed 75%, a specific capac- itance of 560 Fg(-1) was achieved. On the other h and, carbon nanotubes/RuO2. xH(2)O capacitors exhibit excellent power deliv ery behavior. So the processing of carbon nanotubes/RuO2. xH(2)O composite electrodes is a new attempt to fabricate supercapacitors with both high ene rgy and high power density.