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      https://www.ias.ac.in/article/fulltext/jcsc/132/0101

    • Keywords

       

      Electrochemistry; capacitance; energy density; ZIF-67; nanomaterial

    • Abstract

       

      Here reports a hollow cube NiCo2S4 nanomaterial, which was prepared via facile hydroxylation and sulfuration steps using the self-prepared ZIF-67 as a precursor. This kind of NiCo2S4 as an electrode material for supercapacitor presents a specific capacitance high up to 1350 F g-1 at 1 A g-1 due to the contribution of pseudocapacitance. Particularly, the hybrid supercapacitor PC//NiCo2S4, assembled using the NiCo2S4 as the positive electrode material and the PC as the negative electrode material, delivers a high energy density of 33 Wh kg-1 at the power density of 800 W kg-1. Meanwhile, it presents a good cyclic stability with 67% capacitance retention after 10,000 cycles of charge–discharge at the current density of 5 A g-1. However, the rate capability is not good enough because of the polarization effect of NiCo2S4 as a battery-type electrode material. Therefore, this research provides a reference for enhancing capacitance performance of an electrode material. For instance, reversibility in redox reaction and stability in structure are more important than the capacity in many cases.

    • Author Affiliations

       

      XIAOSHAN LI1 YOU FU1 HANG MA1 XILONG LIU2 LINA LI1 JIAN MA1 CONGJIE LIANG1 MENG JIN1 YINGJIE HUA1 CHONGTAI WANG1

      1. Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou South Longkun Rd., Haikou 571158, People’s Republic of China
      2. Chemical college of Jilin University, Changchun 130000, People’s Republic of China
    • Dates

       
  • Journal of Chemical Sciences | News

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