Abstract: 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.

Key words: super capacitor, composite films electrode, specific capacitance, adhesion