▎ 摘　　要

Exploring composite materials with ideal structures is an effective way to achieve synergy among different functional components. In this paper, a thermal decomposition method was adopted to prepared IrO2-CeO2 graphene/Ti composite electrodes. The influence of adding graphene on the composite material's electronic structure was analyzed by first-principles calculations, and its microstructure and electrochemical performance were also observed though various tests. The results indicated that coatings containing graphene exhibited a hierarchical porous structure, which could enlarge the specific surface area effectively. The band gaps of the IrO2-CeO2 composite oxides were filled by the energy level of C, which reduced the electron-transfer resistance. With amorphous CeO2 and the graphene acting as highly efficient ion-diffusion and electron-transfer channels respectively, the electrodes' charge storage performances were improved. The electrodes' specific capacitance values rose at first, then decreased as the graphene contents increased, reaching a maximum of 368 F g(-1) when the content was 2 mg mL(-1). However, adding graphene could harm the electrodes' cycling stability; excessive graphene could also encapsulate IrO2 nanoparticle and hinder contact with the electrolyte, thus reducing the electrodes' specific capacitances.