Abstract
The major purpose of this research is increasing the photocatalytic activity of TiO2 nanotube arrays by doping with sodium and carbon for using in water splitting as photoanode. The synthesized TiO2 nanotubes (TNA) were characterized using FESEM (Field Emission Scanning Electron Microscope), XRD (X-ray Diffraction), DRS (Diffraction Reflection Spectroscopy) and XPS test (X-ray Photoelectron Spectroscopy) analyses. The results of FTIR and XPS confirmed the presence of sodium and carbon in the lattice of TNA as dopants. Moreover, the DRS test showed the decrease in the band gap energy of TNA from 3.20 to ∼2.88eV; uv-visible test exhibited extension in the absorption edge of pure TiO2 nanotubes from Uv-light (396nm) to visible light (488nm). In addition, the results of photoelectrochemical measurement indicated that the photocurrent density of doped TiO2 nanotubes increased about 5 times than that of the pure compounds.
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