Journal
ACS NANO
Volume 12, Issue 3, Pages 2968-2979Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b00653
Keywords
ZnCo1.5(OH)(4.5)Cl-0.5 center dot 0.45H(2)O nanosheets; crystal structure solvation; in situ growth; specific capacitance; solid-state supercapacitors
Categories
Funding
- National Natural Science Foundation of China [51701042, 51372040, 51601040, 51471052, 51571063, U1201241]
- Shanghai Rising-Star Program [16QA1400700]
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Two-dimensional (2D) hydroxide nanosheets can exhibit exceptional electrochemical performance owing to their shortened ion diffusion distances, abundant active sites, and various valence states. Herein, we report ZnCo1.5(OH)(4.5)Cl-0.5 center dot 0.45H(2)O nanosheets (thickness similar to 30 nm) which crystallize in a layered structure and exhibit a high specific capacitance of 3946.5 F g(-1) at 3 A g(-1) for an electrochemical pseudocapacitor. ZnCo1.5(OH)(4.5)Cl-0.5 center dot 0.45H(2)O was synthesized by a homogeneous precipitation method and spontaneously crystallized into 2D nanosheets in well-defined hexagonal morphology with crystal structure revealed by synchrotron X-ray powder diffraction data analysis. In situ growth of ZnCo1.5(OH)(4.5)Cl-0.5 center dot 0.45H(2)O nanosheet arrays on conductive Ni foam substrate was successfully realized. Asymmetric supercapacitors based on ZnCo1.5(OH)(4.5)Cl-0.5 center dot 0.45H(2)O nanosheets @Ni foam// PVA, KOH//reduced graphene oxide exhibits a high energy density of 114.8 Wh kg(-1) at an average power density of 643.8 W kg(-1), which surpasses most of the reported all-solid-state supercapacitors based on carbonaceous materials, transition metal oxides/hydroxides, and MXenes. Furthermore, a supercapacitor constructed from ZnCo1.5(OH)(4.5)Cl-0.5 center dot 0.45H(2)O nanosheets@PET substrate shows excellent flexibility and mechanical stability. This study provides layered bimetallic hydroxide nanosheets as promising electroactive materials for flexible, solid-state energy storage devices, presenting the best reported performance to date.
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