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 Co3O4Nss were firstly obtained by thermal treatment of MOF templates in air. Then, ultrathin NiCoLDHNss were in-situ electrodeposited on the surface of Co3O4Nss, constructing a core-shell structure. Benefiting the unique hierarchical structure, high conductivity of Co3O4Nss core and large surface area of NiCoLDHNss shell, the Co3O4@NiCoLDHNss 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@NiCoLDHNss 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. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.