Compounding　different　materials　with　different　properties　to　be　one　electrode　is　a　good　and　common　way　in　supercapacitors.　IrO2was　used　as　an　active　and　conductive　oxide,　and　ZnO　was　used　as　a　semiconductive　oxide　to　change　the　band　gap　of　IrO2.　Carbon　nanotubes　(CNT)　and　graphene　(G)　were　used　to　improve　the　microstructure　of　the　oxides.　The　electrodes　of　IrO2-ZnO-carbon　nanotube　(CNT)/Ti　and　IrO2-ZnO-graphene　oxide　(G)/Ti　were　prepared　by　a　thermal　decomposition　method,　and　the　different　effects　of　CNT　or　G　on　the　properties　were　studied　in　detail.　The　surface　of　IrO2-ZnO-CNT/Ti　had　a　＇hill-bag＇　structure,　and　the　IrO2-ZnO-G/Ti　had　a　graphene　sheet-layered　fold　structure.　Their　specific　surface　area　and　pore　volume　were　significantly　greater　than　those　of　an　electrode　without　a　carbon　material.　The　specific　capacitances　of　IrO2-ZnO-G/Ti　and　IrO2-ZnO-CNT/Ti　were　681　and　501　F　g-1,　respectively,　which　were　higher　than　that　of　IrO2-ZnO/Ti　(399　F　g-1).　The　capacitance　retention　rate　of　the　IrO2-ZnO-G/Ti　electrode　coating　was　better　than　that　of　IrO2-ZnO/Ti　within　15,000　cycles　but　less　than　that　of　IrO2-ZnO/Ti　after　15,000　cycles.　Moreover,　only　a　retention　rate　of　80.24%　after　20,000　cycles　was　kept,　which　was　worse　than　that　of　IrO2-ZnO/Ti　(90.65%).　The　reasons　were　worth　further　investigation.　The　addition　of　carbon　materials　reduced　the　cycle　stability,　but　the　binding　effect　of　graphene　and　the　coating　was　better　than　that　of　carbon　nanotubes.　Graphene　improved　the　overall　performance　better　than　carbon　nanotubes.　A　binder-free　asymmetric　supercapacitor　working　in　H2SO4solution　was　assembled　with　RuO2-MoO3/Ti　and　IrO2-ZnO-G/Ti　as　cathodic　and　anodic　electrodes,　respectively.　It　exhibited　energy　densities　of　29.6　and　25.3　W　h　kg-1when　the　power　densities　were　700　and　3505　W　kg-1,　respectively.　The　primary　charge/discharge　mechanism　of　the　asymmetric　supercapacitor　in　the　H2SO4solution　was　presented.　©　2022　American　Chemical　Society.　All　rights　reserved.