Abstract
WO3 with various morphologies and crystal phases were prepared via a hydrothermal process in the presence of different Na2SO4 concentrations. Experimental results indicated that the preferred growth face ((200) crystal plane) of hexagonal WO3 could adsorb abundant Na+, which induced the WO3 growing along [001] crystal direction to form nanorods, and hexagonal phase WO3 nanorods with diameter of 30–150nm and length of 0.5–5μm were obtained in the presence of 0.25M Na2SO4, while excessive Na2SO4 led to a mixed crystal consisting of cubic H2W2O7 and hexagonal WO3. The photoactivities for O2 evolution for various products were investigated by using Fe(NO3)3 as a sacrificial reagent under visible-light irradiation, and the hexagonal phase WO3 nanorods show a better photoactivity than the other products with different morphologies and crystal phases due to its fast three-dimensional photogenerated carrier transfer along its special rod-shaped structure.
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