MnO2 Nanosheets Decorated MOF-Derived Co3O4 Triangle Nanosheet Arrays for High-Performance Supercapacitors

In this work, hierarchical Co₃O₄@MnO₂ nanosheet (NS) hybrid nanostructures are grown on carbon cloth by a facile method combining the metal–organic framework (MOF) templating process and electrodeposition. Due to the synergetic effect between Co₃O₄ triangle NSs and MnO₂ NSs and the unique structure with large surface area and numerous channels for ion diffusion, the Co₃O₄@MnO₂ core–shell NS array electrode shows good electrochemical properties with a high specific capacitance of 644.8 F g⁻¹ at a current density of 1 A g⁻¹, remarkable rate capability (capacitance retention of 64.5% at 20 A g⁻¹) and excellent cycle performance (capacitance retention of 91% after 3000 cycles at 5 A g⁻¹). The excellent electrochemical performance makes the Co₃O₄@MnO₂ core–shell NSs promising candidates in supercapacitors.