Abstract
Nickel hydroxide nanosheets were successfully synthesized by facile solvothermal method without any template. The structure and morphology of the as-prepared sample were characterized by X-ray diffraction, Fourier transform infrared spectroscopy and transmission electron microscopy. The observations revealed the formation of hexagonal phase β-Ni(OH)2 nanosheets with an average diameter of about 100–120 nm. Electrochemical studies were carried out using cyclic voltammetry and galvanostatic charge–discharge tests, respectively. A maximum specific capacitance of 2,342 F g−1, which is the highest reported for a β-Ni(OH)2 electrode, could be achieved in 6 mol L−1 KOH electrolyte within the potential range of 0–0.50 V (vs. SCE) for the obtained β-Ni(OH)2 electrode at 0.4 A g−1, suggesting its potential application in the electrode material for electrochemical capacitors.
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