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

Hierarchical Co₃O₄@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 Co₃O_4NSs were firstly obtained by thermal treatment of MOF templates in air. Then, ultrathin NiCoLDH_NSs were in-situ electrodeposited on the surface of Co₃O_4NSs, constructing a core-shell structure. Benefiting the unique hierarchical structure, high conductivity of Co₃O_4NSs core and large surface area of NiCoLDH_NSs shell, the Co₃O₄@NiCoLDH_NSs array served as supercapacitor electrode exhibits excellent electrochemical properties, such as high specific capacitance of 1708 F g⁻¹ (850 C g⁻¹) at a current density of 1 A g⁻¹, good rate capability, and excellent cycling stability. Further, the asymmetric supercapacitor assembled by Co₃O₄@NiCoLDH_NSs and activated carbon, also displays superior electrochemical performance 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.