Abstract
A novel method has been developed in this study for preparation of the spinel nickel cobaltite (NiCo2O4) nanoparticles. The workflow comprises a microwave-assisted hydrothermal process using nickel nitrate hexahydrate and cobalt nitrate hexahydrate as precursor and urea as hydrolysis-controlling agent, followed by calcination. First, the needle-like nickel carbonate hydroxide hydrate and cobalt basic carbonate are obtained by microwave-assisted hydrothermal process under 800W microwave irradiated for 5min. Then, the needle-like nickel carbonate hydroxide hydrate and cobalt basic carbonate composites are calcined at 400°C for 2h to fabricate NiCo2O4 nanoparticles. The NiCo2O4 nanoparticles show a high-specific capacitance of 332.8F/g under a mass loading of 2mg/cm within −0.5 and 0.5V at a scan rate of 100mV/s in a 0.5M H2SO4 solution. The NiCo2O4 is analyzed and characterized by X-ray power diffraction (XRD), transmission electron microscopy (TEM), infrared spectroscopy (IR), and cycle voltammograms (CV).
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