Ultrathin Mesoporous NiCo2O4 Nanosheets Supported on Ni Foam as Advanced Electrodes for Supercapacitors

Authors

  • Changzhou Yuan,

    1. Anhui Key Laboratory of Metal Materials and Processing, School of materials Science and Engineering, Anhui University of technology, Màanshan, 243002, P. R. China
    2. School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457
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  • Jiaoyang Li,

    1. Anhui Key Laboratory of Metal Materials and Processing, School of materials Science and Engineering, Anhui University of technology, Màanshan, 243002, P. R. China
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  • Linrui Hou,

    1. Anhui Key Laboratory of Metal Materials and Processing, School of materials Science and Engineering, Anhui University of technology, Màanshan, 243002, P. R. China
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  • Xiaogang Zhang,

    1. College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
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  • Laifa Shen,

    1. College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
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  • Xiong Wen (David) Lou

    Corresponding author
    1. School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457
    • School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457.
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Abstract

A facile two-step method is developed for large-scale growth of ultrathin mesoporous nickel cobaltite (NiCo2O4) nanosheets on conductive nickel foam with robust adhesion as a high-performance electrode for electrochemical capacitors. The synthesis involves the co-electrodeposition of a bimetallic (Ni, Co) hydroxide precursor on a Ni foam support and subsequent thermal transformation to spinel mesoporous NiCo2O4. The as-prepared ultrathin NiCo2O4 nanosheets with the thickness of a few nanometers possess many interparticle mesopores with a size range from 2 to 5 nm. The nickel foam supported ultrathin mesoporous NiCo2O4 nanosheets promise fast electron and ion transport, large electroactive surface area, and excellent structural stability. As a result, superior pseudocapacitive performance is achieved with an ultrahigh specific capacitance of 1450 F g−1, even at a very high current density of 20 A g−1, and excellent cycling performance at high rates, suggesting its promising application as an efficient electrode for electrochemical capacitors.

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