The　oxide　coatings　(Ir0.2Mn0.6Sn0.2O2)　were　prepared　by　thermal　decomposition　on　Ti　substrate　at　different　temperature.　The　influence　of　the　annealing　temperature　on　capacitive　performance　of　the　Ti/Ir0.2Mn0.6Sn0.2O2　electrode　was　investigated　by　means　of　X-ray　diffraction　(XRD),　transmission　electron　microscopy　(TEM),　scanning　electron　microscopy　(SEM),　cyclic　voltammetry　(CV),　galvanostatic　charge–discharge　and　electrochemical　impedance　spectroscopy　(EIS).　The　results　are　shown　that:　Mn3O4　could　be　crystallized　only　at　320 °C,　which　was　lower　than　those　of　hydroxides,　and　hydroxyoxides　or　oxysalts　of　manganese　calcined　at　about　1000 °C　in　air.　The　Ti/Ir0.2Mn0.6Sn0.2O2　electrode　prepared　at　340 °C　was　favor　to　form　a　certain　amount　of　amorphous　phase　and　nano-crystalline　phase　at　the　same　time,　which　exhibited　good　electronic　conductivity　and　proton　conductivity.　The　maximum　specific　capacitance　was　207 F/g,　which　increased　about　37%　than　that　of　Ti/IrO2[sbnd]SnO2　electrode.　The　charge-transfer　Rct　of　the　Ir0.2Mn0.6Sn0.2O2　coatings　first　decreased　and　then　increased　with　the　increasing　annealing　temperatures.　The　excellent　capacitance　performance,　power　characteristics　and　the　volt-ampere　power　could　be　also　obtained　at　the　same　time.　The　homogeneously　distributed　conductive　nanocrystalline　particles　in　the　amorphous　matrix　can　greatly　improve　the　electronic　conductivity　of　the　coatings,　but　it　did　not　sacrifice　the　proton　conductivity.　©　2017　Elsevier　B.V.