Abstract
To activate the wide functionalities of TiO2 in photoelectrochemical applications, tungsten–silver codoped TiO2 with different tungsten doping concentrations were synthesized using hydrothermal method. The codoped TiO2 displayed pure anatase phase with strong absorption in visible light region describing the possible modification in electronic band structure due to codoping. Transmission electron microscopy observation shows that nano-particles have spherical morphology with uniform particle size distribution. X-ray photoelectron spectroscopy (XPS) verified the existence of tungsten and silver in the TiO2 network, responsible for tuning the absorption edge and improving the photoactivity. The photoactivity of synthesized nano-materials was tested by photodegradation of methylene blue under visible light irradiations. All the synthesized codoped samples exhibit enhanced photo-response compared to that of undoped TiO2. Among all the codoped samples, the one with tungsten doping concentration of 3.5at% possesses the best photocatalytic activity attributed to the synergistic effect between the dopants and optimal doping concentration.
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