However, the actual absorption spectrum of a photocatalyst is an overlapping result of intrinsic and extrinsic absorption bands [42].Figure 6UV-Vis diffuse reflectance spectra of the samples (TNTAs, PCTs, BTs, and inset, Ti foil).Furthermore, Figure ???Figure77 clearly shows the comparison curves of the photocurrent densities versus applied potentials for three different TiO2 photoanodes (TNTAs, B