Based　on　the　corrosion　and　low　decomposition　voltage　of　acid　solutions,　many　electrodes　are　limited　in　the　fields　of　supercapacitors.　MoO3　has　a　wide　potential　window　from　-1.0　to　0.8　V　in　acid　solution　in　theory.　But　there　are　very　few　reports　of　MoO3　used　as　anode　due　to　its　poor　cycle　stability　and　low　electrochemical　performance　under　a　negative　potential　in　most　electrolyte　solutions.　The　MoO3-RuO2/Ti　was　prepared　by　thermal　decomposition.　The　phase　structure,　pore　size,　microstructure　and　capacitive　characteristics　of　the　MoO3-RuO2/Ti　with　different　content　of　RuO2　were　analyzed　in　detail　by　XRD,　SEM,　EDS,　XPS,　BET　and　electrochemical　tests.　The　amorphous　RuO2　was　evenly　distributed　in　MoO3.　Remarkably,　a　high　surface　area　and　total　pore　volume　were　achieved　by　adding　5mol%　RuO2　into　MoO3,　which　resulted　in　a　specific　capacity　of　639　C　g–1　at　1A　g–1.　The　poor　cycle　stability　and　electrochemical　performance　of　MoO3　under　a　negative　potential　were　greatly　improved　by　adding　RuO2.　MoO3-RuO2/Ti　used　as　anode　in　H2SO4　electrolyte　was　firstly　discussed.　The　working　voltage　of　MoO3-RuO2/Ti　for　anode　was　-0.35　to　0　V　and　had　an　excellent　specific　electrochemical　performance.　Asymmetric　supercapacitor　(ASC)　was　constructed　using　the　MoO3-RuO2/Ti　as　anode　and　the　IrO2-ZnO/Ti　as　cathode　in　H2SO4　electrolyte,　which　could　be　run　under　the　potential　range　from　0　to　1.5　V.　When　the　power　density　of　asymmetric　supercapacitor　was　932　W　kg–1　and　6580　W　kg–1,　the　energy　density　was　80.5　Wh　kg–1　and　57.4　Wh　kg–1,　respectively.　Asymmetric　supercapacitor　with　the　MoO3-RuO2/Ti　as　anode　and　the　RuO2-ZnO/Ti　as　cathode　was　also　successfully　assembled.　©　2022