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.

Automated summary

Hierarchical Co3O4@NiCoLDH nanosheets were prepared on carbon cloth through a multistep method, with a core-shell structure formed by electrodeposition of ultrathin NiCoLDH on Co3O4 nanosheets. The unique hierarchical structure and high conductivity of Co3O4 core, along with the large surface area of NiCoLDH shell, contribute to the excellent electrochemical properties exhibited by the supercapacitor electrode.