Journal
ACS NANO
Volume 6, Issue 6, Pages 5531-5538Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn301454q
Keywords
core/shell; nanowire arrays; cobalt oxide; nickel oxide; supercapacitor; electrochemical storage
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Funding
- China Postdoctoral Science Foundation [20100481401]
- Zhejiang Province Education Department [Y201119640]
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The high performance of a pseudocapacitor electrode relies largely on a scrupulous design of nanoarchitectures and smart hybridization of bespoke active materials. We present a powerful two-step solution-based method for the fabrication of transition metal aide core/shell nanostructure arrays on various conductive substrates. Demonstrated examples include Co3O4 or ZnO nanowire core and NiO nanoflake shells with a hierarchical and porous morphology. The oriented attachment and self-assembly' crystal growth mechanisms are proposed to explain the formation of the NiO nanoflake shell. Supercapacitor electrodes based on the Co3O4/NiO nanowire arrays on 3D macroporous nickel foam are thoroughly characterized. The electrodes exhibit a high specific capacitance of 853 F/g at 2 A/g after 6000 cycles and an excellent cycling stability, owing to the unique porous core/shell nanowire array architecture, and a rational combination of two electrochemically active materials. Our growth approach offers a new technique for the design and synthesis of transition metal oxide or hydroxide hierarchical nanoarrays that are promising for electrochemical energy storage, catalysis, and gas sensing applications.
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