كليدواژه :
Photoelectrochemical , TiO2 nanowires , nanotubes arrays , g , C3N4
چكيده فارسي :
TiO2 nanowires/nanotubes arrays have been extensively investigated to build photoanode for photoelectrochemical (PEC) water splitting, due to their good stability, low cost, and nanostructure-derived unique properties but large band gap [1]. G-C3N4 as a new kind of polymer semiconductor with high thermal and chemical stability and surface area possesses appropriate bandgap (∼2.7 eV) that can absorb visible light up to 450 nm. However, the physical and chemical properties of g-C3N4 depend on type of precursors and the processing temperature [2]. In this work, TiO2 nanowires/nanotubes arrays were directly deposited on titanium foil via anodization method [3]. In addition, g-C3N4 were synthesized by thermal polycondensation of melamine at different temperatures (450, 550 and 650 0C) [2]. For sensitization of TiO2 nanowires/nanotubes arrays, g- C3N4 samples coated on the TiO2 nanowires/nanotubes arrays. Based on our results, the crystalline structure, nitrogen content, band gap and morphology of the g-C3N4 materials were varied with the increasing of temperature. Scanning electron microscopy (SEM) image of the g-C3N4 (550 0C)/ TiO2 nanowires/nanotubes arrays (Fig. 1) shows presence of g-C3N4 g-C3N4 (550 0C) sheets on the TiO2 nanowires/nanotubes arrays/Ti. Our results introduce the g-C3N4 obtained from thermal polycondensation of melamine, as promising photocatalytic materials for PEC water splitting application. Moreover, by using photoelectrochemical techniques, the optimal thermal condensation temperature for g-C3N4 in PEC water splitting was obtained.
