Preparation and Performance of (RuO2/Co3O4)·nH2O Composite Films in Super Capacitor

The (RuO2/Co3O4)·nH2O composite films electrode used in super capacitor was prepared from isopropanol solution of RuCl3·3H2O and Co(CH3COO)2 by in―situ thermal decomposition. The micro― morphology, phase transformation and electrochemical properties were studied by scanning electron microscope, XRD, infrared spectrometer and electrochemical method, respectively. The results show that, the composite films with n(Rn3+): n(Co2+)=1:3 exhibit the best performances after heat treatment at 260 for 3h. The specific capacitance and adhesive force of the composite films are 569F/g and 22.4MPa, respectively. The internal resistance of the composite films is only 0.42Ω and its specific capacitance keep 97.6% of initial capacitance after over 1000 charge―discharge cycles.