The photoelectrochemical characteristics of plasma sprayed porous TiO2, TiO2-5%ZnO and TiO2-10%ZnO electrodes in 0.1N NaOH solution were studied through a three-electrode cell system. The microstructure, morphology and composition of the electrodes were analyzed using electron probe surface roughness analyzer (ERA-8800FE), scanning electron microscope (SEM) and X-ray diffraction. The results showed that the sprayed electrodes had a porous microstructure, which was affected by the plasma spraying parameters and composition of the powders. TiO2-ZnO electrodes consisted of anatase TiO2, rutile TiO2 and Zn2Ti3O8 phase. The photoresponse characteristics of the plasma sprayed electrodes were comparable to that of single crystal TiO2, but the breakdown voltage was approximate to 0.5V (vs. SCE). The short-circuit photocurrent density increased with a decrease of donor concentration, which was calculated according to Garner-Bulter model. For the lowest donor concentration of a TiO2-5%ZnO electrode prepared under the arc current of 600A, the short-circuit photocurrent density was approximately 0.4mA/cm2 higher than that of the TiO2 electrodes under 30mW/cm2 xenon light irradiation. The photocurrent density increased linearly with light intensity.

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