Abstract
Hollow rods of NiGa2O4 were successfully prepared via a facile template-engaged reaction of nickel salt and commercially available rod-like Ga2O3. The samples were characterized by X-ray diffraction (XRD), UV−vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and energy dispersive X-ray spectrum (EDS). The results showed that the pH value, reaction time, and hydrothermal temperature have crucial effects on the formation of the phase and microstructure of the as-prepared NiGa2O4. The growth mechanism of the NiGa2O4 hollow rods was proposed. This facile and green method is proved to be a generic method for the one-step synthesis of hollow rods of other metal gallates, such as ZnGa2O4. The photocatalytic activity of RuO2-loaded NiGa2O4 was investigated by photocatalytic water splitting for hydrogen production.
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