Development of supercapacitors based on carbon nanotubes

Block-type electrodes made of carbon nanotubes were fabricated by different processes. The volumetric specific capacitance based on such electrodes re ached 107 F/cm(3), which proves carbon nanotubes to be ideal candidate mate rials for supercapacitors. The composite electrodes consisting of carbon na notubes and RuO2. xH(2)O were developed by the deposition of RuO2 on the su rface of carbon nanotubes. Supercapacitors based on the composite electrode s show much higher specific capacitance than those based on pure carbon nan otube ones. A specific capacitance of 600 F/g can be achieved when the weig ht percent of RuO2. xH(2)O in the composite electrodes reaches 75%. In addi tion, supercapacitors-based on the composite electrodes show both high ener gy density and high power density characteristics.