FABRICATION AND CHARACTERIZATION TITANIA NANOTUBES BY ANODIZATION FOR HYDROGEN GENERATION
Keywords:
Titania nanotubes, TiO2, anodization, hydrogen production, renewable energyAbstract
Titania nanotubes (TiO2 NTs) were synthesized by an anodization method. The electrolytes were the mixtures of oxalic acid (H2C2O4), ammonium fluoride (NH4F), and sodiumsulphate (VI) (Na2SO4) with different ratios. A constant dc power supply at 50 V was used in anodization. The samples were annealed at 450°C for 2 h. Scanning Electron Microscopy(SEM) and X-ray diffraction (XRD) were used to characterized TiO2 NTs. TiO2 NTs with diameter of 100 nm were obtained when the electrolyte of 0.08 M oxalic acid, 0.5 wt%NH4F, and 1.0 wt% Na2SO4 was used. The maximum photocurrent density was 4.2 mA/cm2under illumination of 100 mW/cm2. Hydrogen was generated at an overall conversion efficiency of 3.7%.
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