Abstract
The anatase phase titanium dioxide nanotubes (ATNTs) is investigated for photocatalytic water splitting in pristine form and after copper oxide (CuO) incorporation. ATNTs are grown using titanium substrate by one and two step anodization followed by annealing at 450 ºC for transformation to anatase phase. Both of the anodization steps are performed by electrochemical process using ammonium fluoride, ethylene glycol and deionized water as electrolyte. The ATNTs are then modified with CuO nanoparticles, electrochemically and also through dip-coating process. The growth of ATNTs and deposition of CuO nanoparticles is confirmed with X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) spectroscopy. Well organized and vertically aligned nanotubes are confirmed under FESEM. Linear Sweep Voltammetry (LSV) technique is performed for photocurrent responses in distilled water in the dark environment as well as in the light of solar simulator at applied potential of 1.0V. ATNTs grown with two steps anodization offered promising results for photocatalytic water splitting compared to single step anodization. The CuO modification in ATNTs shown a reasonable increase in photocurrent densities compared to pristine ATNTs. Moreover, the ATNTs modified with CuO through electrochemical deposition exhibited greater photocurrent responses than the dip coating method. Figure 1
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