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Electrochemical Fabrication of Coaxial Wavy-Channel NiIIIO(OH)/Ni Nanocomposites for High-Performance Supercapacitor Electrode Materials

Authors

  • Chun-Kwan Tsang,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
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  • Shanshan Zeng,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
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  • Hua Cheng,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
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  • Lingxia Zheng,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
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  • Jie Zhang,

    1. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
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  • Hui Li,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
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  • Shi-Wei Shu,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
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  • Tak Fu Hung,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
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  • Prof. Jian Lu ,

    Corresponding author
    1. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
    2. Centre for Advanced Structural Materials, City University of Hong Kong Shenzhen Research Institute, 8 Yuexing 1st Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen (PR China)
    • Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
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  • Prof. Yang Yang Li 

    Corresponding author
    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
    2. Centre of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
    3. City University of Hong Kong Shenzhen Research Institute, 8 Yuexing 1st Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen (PR China)
    • Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong (PR China)
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Abstract

The supercapacitor electrode material reported herein is a type of NiIIIO(OH)/Ni coaxial nanocomposite with NiIIIO(OH) wrapping around a Ni scaffold, featuring vertically oriented nanochannels with periodically-corrugated channel walls. A Ni scaffold was constructed through the electrodeposition of a Ni–Cu alloy film by using a square-wave voltage followed by a dealloying treatment to selectively remove Cu. By further coating the fabricated Ni framework with NiIIIO(OH) through anodic electrodeposition, we obtained wavy-channel NiIIIO(OH)/Ni coaxial nanostructures, which readily served as a supercapacitor electrode. The as-fabricated supercapacitor electrode exhibited superior performance with a remarkable specific capacitance (SC) of 2372 F g−1 (after the contribution from the bare Ni scaffold was subtracted), measured at the charge and discharge rate of 1 A g−1. This is 48 % higher than the straight-channel counterpart and is almost a three-fold increase compared to the compact NiIIIO(OH) thin film. Moreover, superior cycling stability was achieved at high charge and discharge current densities, for example, only 10 % of the SC was lost over the first 200 cycles with no further change in the subsequent 800 cycles at 50 A g−1.

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