CHARACTERIZATION OF NANOSTRUCTURED HYDROUS RuO_2/CARBON SUPERCAPACITOR ELECTRODE PREPARED BY COLLIDAL METHODS

摘要

Amorphous nanostructured ruthenium oxide on carbon was prepared by colloidal method using RuCl_3*xH_2O (39.99wt% Ru) and NaHCO_3 (Aldrich) at pH=5. FTRaman study confirmed that ruthenium complex converted to ruthenium oxide after annealing at 100 ℃. The specific capacitance of RuO_2/carbon composite electrode (40wt% Ru) was calculated by using cyclic voltammetry to be 407 F/g. The specific capacitance of RuO_2*nH_2O was estimated to be approximately 840 F/g by subtracting the contribution of double layer capacitance resulting from carbon in the composite. Transmission electron microscopy indicated that the particle size of RuO_2*nH_2O on carbon was approximately 3nm. The observed very high specific capacitance is due to the increase in the active bulk volume of the amorphous nanostructured RuO_2*nH_2O particles.