Multi-structural tungsten oxide (WO 3 Á0.33H 2 O) samples were prepared using a hydrothermal method in the presence of different salts Na 2 SO 4 and CaCl 2 respectively. The experimental results showed that pH value of the reaction solution greatly affects crystal morphology of the final products. To explore the photocatalysis originated from nanonetwork hierarchical structure, the photodegradation of methylene blue was carried out under simulated sunlight irradiation. The photocatalytic activity of the WO 3 Á0.33H 2 O nanonetworks was compared with that of the nanoplates, and the former showed a higher photocatalytic activity owing to its novel hierarchical structure. Our investigation demonstrates that nanonetwork hierarchical structure can promote sunlight absorption due to higher specific surface area.

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Tungsten oxide (WO3·0.33H2O) networks and nanorods were prepared by a hydrothermal method. Platinum nanoparticles were distributed on the two types of WO3·0.33H2O nanostructures for the methanol and ethanol electrooxidation. The synthesized WO3·0.33H2O nanostructures and WO3·0.33H2O supported platinum (Pt/WO3·0.33H2O) catalysts are characterized by X-ray diffraction, scanning electron microscope and high resolution transmission electron microscope. The electrocatalytic properties of the Pt/WO3·0.33H2O composites for the methanol and ethanol oxidation were investigated systematically by typical electrochemical methods and compared with that of Pt supported on carbon nanoparticles. The Pt/WO3·0.33H2O network-shaped catalyst shows much higher electrocatalytic activity than that of the other two electrocatalysts as a result of its specific morphology that provides multidimensional active sites and radial channels for liquid diffusion.

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