• Morphology-dependent electrochemical performances of nickel hydroxide nanostructures

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      https://www.ias.ac.in/article/fulltext/boms/042/06/0265

    • Keywords

       

      Hydroxides; nickel hydroxide; supercapacitors; nanosheets; microflowers.

    • Abstract

       

      Electrochemical capacitors form part of the developing technologies in the field of alternative energy sources. In the present work, nickel hydroxide (Ni(OH)$_2$) nanosheets and microflowers are hydrothermally prepared employing different chemical precursors. Structure, morphology and chemical analysis are conducted using powder X-ray diffraction, field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy measurements. Electrochemical performances as supercapacitor electrodes of the synthesized nanostructures are evaluated through cyclic voltammetry and galvanostatic charge–discharge measurements with three-electrode configurations. The results indicated the specific capacitance of 180 and 417 F g$^{−1}$ at a scan rate of 5 mV s$^{−1}$ for Ni(OH)$_2$ nanosheets and microflowers, respectively.The higher specific capacitances for Ni(OH)$_2$ microflowers could be attributed to the higher specific surface area, morphology, electronic conductivity and porosity. Both Ni(OH)$_2$ nanostructures exhibited good capacitance retention for 1500 cycles.

    • Author Affiliations

       

      KARTHIK S BHAT1 H S NAGARAJA1

      1. Department of Physics, National Institute of Technology Karnataka, P.O. Srinivasnagar, Surathkal, Mangaluru 575 025, India
    • Dates

       
  • Bulletin of Materials Science | News

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