Synthesis and Characterization of WO3 Loaded TiO2 Nanotube Arrays Electrode and Its Photocatalytic Activity

摘要

WO3 loaded TiO2 nanotube arrays electrode was prepared by cathodic electrodepositing WO3 onto TiO2 nanotube arrays substrate under square waveform pulses,and the substrate was obtained by potentiostaticanodization of Ti in aggressive media(NH4 F,H2 O,and Glycerol).The solution for electrodepositing consists in a mixture of 5 mM Na2 WO4,20 mM H2 O2 and 70 mL 40％ isopropanol solution acidified at pH 1.2 by perchloric acid addition.Square waveform pulses were applied on the substrate with cathodic pulse potentials of-0.24 V vs SCE for WO3 deposition,with the pulse duration of 100 ms,followed by a potential pulse at 0 V for 1000 ms.