NiCoLDH nanosheets grown on MOF-derived Co3O4 triangle nanosheet arrays for high-performance supercapacitor
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第3期
论文作者：Xuemin Yin Hejun Li Ruimei Yuan Jinhua Lu
文章页码：60 - 69
摘 要：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 Co3O4 NSs 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 Co3O4 NSs 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 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.
Xuemin Yin，Hejun Li，Ruimei Yuan，Jinhua Lu
State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University
摘 要：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 Co3O4 NSs 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 Co3O4 NSs 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 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.
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