Preparation of NiO Nanosheets by Hydrothermal Method and its Electrochemical Capacitive Properties

Abstract:

The precursor Ni (OH)₂ was synthesized by a simple hydrothermal method with NiSO₄•6H₂O and (CH₂)₆N₄ as reactants. Both concentrations of reactants are 0.02 M, 0.04 M, 0.06 M, 0.08 M for experiment contrast, and then NiO was gained after calcination at 400°C. The phase and morphology of the synthesized product were characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). The electrochemical capacitive characterization was performed using cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrical impedance spectroscopy (EIS) measurements in a 6mol/L KOH aqueous solution electrolyte. The result shows that with the increase of concentrations of reactants, nanosheets stack together and turn into thick slices. CV curves have obvious redox peak, the GCD curves are nonlinear and EIS curves of high frequency area are semicircle. From electrochemical analysis, the capacitance type is pseudocapacitance. And a maximal specific capacitance value when two reactants concentration both are 0.08 M which the specific capacitance decreases from 97 F/g (at a current density of 0.3A/g) to 56 F/g (at a current density of 1 A/g).

• Periodical: Materials Science Forum (Volume 848)
• Pages: 396-400
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.848.396
• Online since: March 2016
• Authors: Zhong Yang Wang, Run Hua Fan, Qian Qian Li, Lei Qian
• Keywords: Electrochemical Properties, Hydrothermal Method, Nanosheets, Nickel Oxide

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