【摘 要】
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Co3O4 is one of the most studied transition-metal oxides for use in energy-storage devices.However,its poor conductivity and stability limit its application.In
【机 构】
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Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 54
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Co3O4 is one of the most studied transition-metal oxides for use in energy-storage devices.However,its poor conductivity and stability limit its application.In this study,a facile method for anchoring Co3O4-encapsulated Cu2O nanocubes on porous carbon (PC) to form Cu2O@Co3O4/PC was developed.The Cu2O@Co3O4/PC composite exhibited superior electrochemical performance as a supercapacitor electrode material.The resultant supercapacitor delivered high specific capacitance (1096 F g-1 at 1 A g-1),high rate capability (83 % retention at 10 A g-1),and excellent cycling stability (95 % retention of initial capacitance after 3000 cycles).Moreover,an asymmetric supercapacitor fabricated by coupling a Cu2O@Co3O4/PC positive electrode with a reduced graphene oxide negative electrode exhibited high energy density (32.1 W h kg-1 at 700 W kg-1).Thus,our results demonstrate that Cu2O@Co3O4/PC is a promising electrode material for energy-storage devices.
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