762730.fig.002
Figure 2: (a) TEM micrographs of titanate nanotubes calcined at 400°C. (b) Specific surface area of samples calcined at different temperatures. (c) I-V curves for titanate nanotubes calcined at different temperatures. Illumination intensity of 100 mW cm−2 with global AM 1.5 and an active area of 0.25 cm2 were applied [16].