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Nickel Phosphite Superstructures Assembled by Nanotubes: Original Application for Effective Electrode Materials of Supercapacitors

Authors

  • Prof. Huan Pang,

    Corresponding author
    1. College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, Henan (P.R. China), Fax: (+86) 0372-2900213
    2. State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093, Jiangsu (P.R. China)
    • College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, Henan (P.R. China), Fax: (+86) 0372-2900213

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  • Dr. Chengzhen Wei,

    1. State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093, Jiangsu (P.R. China)
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  • Dr. Yahui Ma,

    1. College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, Henan (P.R. China), Fax: (+86) 0372-2900213
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  • Dr. Shanshan Zhao,

    1. College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, Henan (P.R. China), Fax: (+86) 0372-2900213
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  • Dr. Guochang Li,

    1. College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, Henan (P.R. China), Fax: (+86) 0372-2900213
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  • Prof. Jiangshan Zhang,

    1. College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, Henan (P.R. China), Fax: (+86) 0372-2900213
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  • Prof. Jing Chen,

    1. College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, Henan (P.R. China), Fax: (+86) 0372-2900213
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  • Prof. Sujuan Li

    Corresponding author
    1. College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, Henan (P.R. China), Fax: (+86) 0372-2900213
    • College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, Henan (P.R. China), Fax: (+86) 0372-2900213

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Abstract

Nickel phosphite (Ni11(HPO3)8(OH)6) superstructures assembled by nanotubes are synthesized under mild hydrothermal conditions with the sodium salt of polystyrene sulfonic acid. More importantly, Ni11(HPO3)8(OH)6 superstructures are applied as electrode materials for supercapacitors. Benefitting from their novel superstructures, in a three-electrode system, Ni11(HPO3)8(OH)6 superstructure electrodes show a good specific capacitance (1876 F g−1 at 0.625 A g−1), good rate capability, and excellent cycling properties (95 % of the initial specific capacitance at 6.25 A g−1 after 2000 cycles) in 3.0 M KOH. Additionally, asymmetric Ni11(HPO3)8(OH)6–graphene nanosheet supercapacitors are also designed. The specific energy of a cell in 3.0 M KOH reaches about 28.6 Wh kg−1 at 92.5 W kg−1.

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