(Ir0.3Sn(0.7-x)Cex)O2　ternary　oxide　electrode　materials　(0<x<0.5)　were　obtained　by　thermal　decomposition　method　on　Ti　substrate　at　a　moderate　temperature　of　360℃.　The　influence　of　the　compositions　on　microstructure　and　capacitive　performance　of　the　Ti/(Ir0.3Sn(0.7-x)Cex)O2　electrodes　was　investigated　by　XRD,　electrochemical　impedance　spectroscopy　(EIS)　and　cyclic　voltammetry(CV).　The　results　show　that　a　certain　amount　of　Ce　can　reduce　the　degree　of　crystallization　of　rutile　phase　oxide　in　coating,　optimize　the　microstructure　of　the　oxide　coating,　and　therefore　improve　the　capacitive　properties　of　the　electrode　material.　When　x　is　0.2,　the　ternary　oxides　electrode　reaches　its　maximum　specific　capacitance　of　414　F/g,　which　is　about　three　times　of　that　of　the　Ti/IrO2-SnO2　electrode.　The　electrode　shows　a　high　specific　energy　density,　when　the　power　density　is　4.97　kW/kg,　the　corresponding　energy　density　reaches　82.88　W∙h/kg.　When　x　is　more　than　0.3,　the　electronic/protonic　conductivity,　frequency　response　characteristics　as　well　as　capacitive　property　of　the　Ti/(Ir0.3Sn(0.7-x)Cex)O2　electrodes　are　seriously　deteriorated　with　increasing　the　Ce　content.　Therefore,　the　Ce　content　should　be　controlled　in　less　than　0.2　(mole　fraction).　©,　2015,　Central　South　University　of　Technology.　All　right　reserved.