The development of carbon nanotubes/RuO2·χH2O electrodes for electrochemical capacitors

Article abstract of DOI:10.1246/bcsj.73.1813

Carbon nanotubes were refluxed with nitric acid to create acid sites on the surface. After such treatment, amorphous or nano-scale crystalline RuO₂·χH₂O can be adhered to the surfaces of carbon nanotubes by a simple method. RuO₂·χH₂O 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·χH₂O in the composite electrodes reached 75%, a specific capacitance of 560 Fg^-1 was achieved. On the other hand, carbon nanotubes/RuO₂·χH₂O capacitors exhibit excellent power delivery behavior. So the processing of carbon nanotubes/RuO₂·χH₂O composite electrodes is a new attempt to fabricate supercapacitors with both high energy and high power density.