Photo-electro-catalytic performance of highly ordered nitrogen doped TiO2 nanotubes array photoanode

11th Joint Conference on Chemistry in Conjunction with the 4th Regional Biomaterials Scientific Meeting

材料科学;化学;生物科学

Aritonang, Anthoni B.^1,2 ; Surahman, Hedi^1 ; Krisnandi, Yuni K.^1 ; Gunlazuardi, Jarnuzi^1

Departement of Chemistry, Faculty of Mathematics and Science, University of Indonesia, Depok

16424, Indonesia^1

Departement of Chemistry, Faculty of Mathematics and Science, University of Tanjungpura, Pontianak

78381, Indonesia^2

关键词: Catalytic performance;    Crystalline structure;    Degradation efficiency;    Diffuse reflectance spectroscopy;    Highly ordered arrays;    Methylene blue solution;    Nitrogen doped TiO2;    TiO2 nanotube arrays;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/172/1/012005/pdf
DOI  :  10.1088/1757-899X/172/1/012005

来源: IOP

【 摘 要 】

Highly ordered nitrogen doped TiO2nanotube arrays (N-TNTAs) were synthesized via a one step anodization method at 40 V for 1 hour, in the electrolyte containing ammonium fluoride (NH4F), water and triethylamine solution, followed calcination under N2atmosphere at 450oC for 3 h. The obtained samples were characterized by means of FE-SEM image showed that the N-TNTs are in a highly ordered array, having inner diameters, wall thickness, tube length of 65 nm, 30 nm and 900 nm, respectively. The X-ray diffraction (XRD) patterns of N-TNTAs and undoped TiO2nanotubes arrays (TNTAs) are identical consists of anatase phase, which suggests that the doping of N does not affect the crystalline structure. X-ray photoelectron spectroscopy (XPS), revealed that N atom was incorporated into the lattice of a TiO2nanotube array film. The infrared spectra, showed a new peak at 1240 cm-1may indicate the incorporation of N into the lattice of TiO2through substituting O atoms, in the form of ∼N-Ti-O∼. A red shift of the absorption edge toward the visible region of N-TNTAs are observed by diffuse reflectance spectroscopy (DRS), which is corresponding to a band gap of 2.8 eV. The photo-electro-catalytic (PEC) degradation efficiency toward methylene blue solution under visible light illumination of the N-TNTAs electrode was 89%, in which the rate constant of N-TNTAs electrode was 8 times better compared to that the undoped TNTAs photo-electrode.