Research Article

Effect of Aging Time and Film Thickness on the Photoelectrochemical Properties of TiO2 Sol-Gel Photoanodes

Table 1

Thickness of sol-gel TiO2 photoelectrodes measured by SEM. The indirect band-gap obtained from the Tauc plot [25] applied to the optical data in Figure 3 is also given.

PhotoelectrodeThickness () (µm)Indirect band-gap (eV)

0 h aging, 1 layer0.6 ± 0.13.25 ± 0.08
3 h aging, 1 layer0.6 ± 0.13.25 ± 0.06
6 h aging, 1 layer0.6 ± 0.13.21 ± 0.08
6 h aging, 2 layers1.1 ± 0.13.22 ± 0.06
6 h aging, 3 layers1.6 ± 0.23.21 ± 0.02