Suspected Case of Reused Spectra
Photo-current spectra are suspected to be reused on the article [1] and [2]. The green line in the Figure 6(c) of the article [1], claimed to be obtained from TiO2 nanotubes, and the red line in Figure 7(c) of the article [2], claimed to be obtained from composite of NiO and TiO2-nanotubes, look too similar than expected.
Reference