Articles written in Bulletin of Materials Science

    • Morphology-dependent electrochemical performances of nickel hydroxide nanostructures


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      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.

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