CNT COMPOSITES

摘要

Synthesis of three-dimensional (3D) electrochemically supercapacitive arrays is disclosed. The arrays comprise multi-walled carbon nanotubes conformally covered by nanocrystalline functional materials such as vanadium nitride and firmly anchored to glassy carbon or Inconel electrodes. These nanostructures demonstrate a respectable specific capacitance of 289 F/g, which is achieved in 1 M KOH electrolyte at a scan rate of 20 m V/s. The well-connected highly electrically conductive structures exhibit a superb rate capability; at a very high scan rate of 1000 m V/s there is less than a 20% drop in the capacitance relative to 20 m V/s. Such rate capability has never been reported for VN and is highly unusual for any other oxide or nitride. These 3D arrays also display nearly ideal triangular voltage profiles during constant current charge-discharge cycling.