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Synthesis of hierarchical Cu2O octahedra@Ni(OH)2 nanosheets core-shell heterostructures for high-performance supercapacitor
In this work, we report the controllable preparation of hierarchical Cu2O octahedra@Ni(OH)2 nanosheets core-shell heterostructures and their application in high-performance supercapacitors. Cu2O octahedra are initially directly grown on Ni foam via a facile solvothermal reaction, followed by the cov...
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Published in: | Materials science in semiconductor processing 2019-03, Vol.91, p.115-123 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | In this work, we report the controllable preparation of hierarchical Cu2O octahedra@Ni(OH)2 nanosheets core-shell heterostructures and their application in high-performance supercapacitors. Cu2O octahedra are initially directly grown on Ni foam via a facile solvothermal reaction, followed by the covering of Ni(OH)2 nanosheets through a controllable electrodeposition method. The prepared Cu2O@Ni(OH)2 core-shell heterostructures were found to exhibit a specific capacitance of up to 892 F g−1 at 1 A g−1 and a capacitance retention of 95% after 5000 cycles at 5 A g−1. Such good electrochemical performance is believed to arise from its unique octahedra@nanosheets core-shell heterostructures and synergistic effect of the Cu2O and Ni(OH)2 components. Moreover, the assembled Cu2O@Ni(OH)2//active carbon asymmetric supercapacitor device could deliver an energy density of 34.8 W h kg−1 at a power density of 798 W kg−1. Our findings not only suggest the great potential of the prepared Cu2O@Ni(OH)2 core-shell heterostructures for use in energy storage devices, but also showcase an alternative approach to construct the composite electrodes with high electrochemical performance. |
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ISSN: | 1369-8001 1873-4081 |
DOI: | 10.1016/j.mssp.2018.11.004 |