NiCoLDH nanosheets grown on MOF-derived Co3O4 triangle nanosheet arrays for high-performance supercapacitor

Hierarchical CoO@NiCoLDH nanosheets(NSs) were prepared on carbon cloth through a multistep method,containing Metal-organic frameworks(MOF)-templated thermal annealing and electrodeposition.The triangle-shaped CoOwere firstly obtained by thermal treatment of MOF templates in air.Then,ultrathin NiCoLDHwere in-situ electrodeposited on the surface of CoO,constructing a core-shell structure.Benefiting the unique hierarchical structure,high conductivity of CoOcore and large surface area of NiCoLDHNSs shell,the CoO@NiCoLDHarray served as supercapacitor electrode exhibits excellent electrochemical properties,such as high specific capacitance of 1708 F g(850 C g) at a current density of 1 A g,good rate capability,and excellent cycling stability.Further,the asymmetric supercapacitor assembled by CoO@NiCoLDHand activated carbon,also displays superior electrochemical perfo rmance with high energy density and power density.Remarkably,the strategy of constructing core-shell structure based on MOF templates could be extended to other electrochemical fields.