Enhancing　the　energy　density　and　power　density　of　the　supercapacitor　has　long　been　the　hot　topic　in　the　field　of　new　energy　storage　devices,　in　which　electrode　materials　including　those　for　anodic　and　cathodic　play　a　key　role.　This　paper　prepared　IrO2–ZnO　nanoelectrode　by　thermal　decomposition　method,　analyzed　the　relationship　between　the　capacitive　properties　and　structures　of　the　electrodes　in　detail.　The　results　shown　that　electrodes　prepared　at　370　°C　exhibited　an　intensive　redox　action,　relatively　low　charge　transfer　resistance　and　high　capacitance　value　of　487　F　g−1　due　to　the　plenty　active　sites　provided　by　its　large　specific　surface　area　and　IrO2–ZnO　nano-particles　distributed　evenly　in　the　amorphous　structures.　A　binder-free　asymmetric　supercapacitor　working　in　H2SO4　solution　was　assembled　with　RuO2–MoO3/Ti　and　IrO2–ZnO/Ti　as　cathodic　and　anodic　respectively.　It　exhibited　energy　densities　of　10.9　W　h　kg−1　and　2.1　W　h　kg−1　when　the　power　density　was　26.7　W　kg−1　and　267.5　W　kg−1　respectively.　Furthermore,　it＇s　the　first　time　to　detect　energy　density　and　power　density　in　acid　solution　of　RuO2–MoO3/Ti　cathode　without　using　of　binding　materials,　which　is　likely　to　become　an　important　method　to　produce　such　pseudocapacitor　in　an　industrial　scale.　©　2019　Elsevier　B.V.