PREPARATION AND CHARACTERIZATION OF SOLâGEL-DERIVED TiO2/ITO PHOTOELECTRODES
In this work, nanocrystalline TiO2/ITO electrodes were prepared by solâgel method starting from tetrabutyl orthotitanate (Ti(OBun)4) reacted with hydrogen peroxide in the ice-water bath. The solâgel derived TiO2 films were characterized by XRD, SEM, BET, and UV/Vis absorption spectroscopic techniques. The preparation conditions, including the number of coats and calcination temperature, were also investigated. Furthermore, PEC cells were constructed for testing the activities of prepared TiO2/ITO photoelectrodes. The photo-currents for hydrogen production via the PEC reaction were measured under UV irradiation (Î»max = 253.7 nm). The experimental results showed that the solâgel derived TiO2 films calcined at 300Â°Câ600Â°C were anatase structure and they showed a maximum UV/Vis absorption at about 380 nm. Moreover, from the result of PEC reactions, it was found that the TiO2/ITO photoelectrode (calcined at 600Â°C, with the thickness of TiO2 layer of about ~0.2 Î¼m) demonstrated a large saturation current (0.326 mA/cm2) with a quite high photoelectrochemical conversion efficiency of 2.39%.
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