Ti/Mn(0.8-x)SnxIr0.2O2　ternary　oxide　electrode　materials　were　obtained　by　Pechini　sol-gel　method.　The　structure　and　electrochemical　performance　of　Ti/Mn(0.8-x)SnxIr0.2O2　electrodes　was　investigated　by　scanning　electron　microscope　(SEM),　X-ray　diffraction　(XRD),　cyclic　voltammetry　(CV)　and　electrochemical　impedance　spectroscopy　(EIS).　The　results　show　that　with　the　content　of　SnO2　increasing,　affirmative　structure　of　Mn3O4　phase　in　Ti/Mn(0.8-x)SnxIr0.2O2　electrodes　oxide　coating　gradually　decreases　in　amount,　but　affirmative　structure　of　SnO2　phase　increases　in　amount.　Compared　with　the　Mn-Ir-based　binary　oxides,　the　addition　of　SnO2　can　significantly　improve　the　current　response　of　electrodes　in　the　range　of　0~0.5　V　and　enhance　activity　of　manganese　oxide,　but　suppress　activity　of　iridium　oxide.　Impedance　analysis　indicates　that　the　charge　transfer　resistance,　the　relaxation　time　constant　and　the　capacity　of　different　frequency　response　of　electrode　materials　change　after　addition　of　SnO2.　In　contrast,　the　Ti/Mn0.6Sn0.2Ir0.2O2　electrode　has　better　capacitance　response　and　higher　activity　in　the　low　frequency　range　(≤　1　Hz),　demonstrating　the　highest　specific　capacitance.　©　2018,　Science　Press.　All　right　reserved.