Three‐dimensional hierarchical nickel‐based hydroxides and oxides microspheres and their electrochemical properties

Nickel hydroxides (Ni(OH) 2 ) with various morphologies, including flower‐like, walnut‐like and particle‐aggregated microspheres, have been successfully synthesised by a surfactant‐assisted microwave hydrothermal method. NiO microspheres have been obtained by calcining corresponding Ni(OH) 2 precursors at 400°C for 2 h. The products were characterised by X‐ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and transform electron microscopy. The electrochemical properties of the NiO microspheres with different morphologies were also investigated.