Variation of the OCP. At (a) for the 0.2% Ce-TiO2 coatings with different layers under illumination, (b) for the three-layer Ce-TiO2 coatings with different cerium ion contents under illumination, and (c) Tafel curves of pure TiO2 coating and 1.2% Ce-TiO2 coating under illumination and in the dark. Line a: 1.2% Ce-TiO2 in the dark, line b: pure TiO2 in the dark; line c: 1.2% Ce-TiO2 under illumination; line d: pure TiO2 under illumination.
Li et al. Nanoscale Research Letters 2012 7:227 doi:10.1186/1556-276X-7-227