Fangzhou Jia

Microporous Ni-Doped TiO2 film Photocatalyst by Plasma Electrolytic Oxidation

Ni-doped TiO2 film catalysts were prepared by a plasma electrolytic oxidation (PEO) method and were mainly characterized by means of SEM, EDS, XRD, XPS, and DRS, respectively. The effects of Ni doping on the structure, composition and optical absorption property of the film catalysts were investigated along with their inherent relationships. The results show that the film catalyst is composed of anatase and rutile TiO2 with microporous structure. Doping Ni changes the phase composition and the lattice parameters (interplanar crystal spacing and cell volume) of the films. The optical absorption range of TiO2 film gradually expands and shifts to the red with increasing dosages. Both direct and indirect transition band gaps of the TiO2 films are deduced consequently. Moreover, the photocatalytic activity of the film catalysts for splitting Na2S+Na2SO3 solution into H2 is enhanced by doping with an appropriate amount of Ni. The as-prepared TiO2 film catalyst doping with 10 g/L of Ni(Ac)2 presents the highest photocatalytic reducing activity.

Mo-doped titania films: preparation, characterization and application for splitting water

A series of Mo-doped TiO2 films are prepared on quartz substrate by the layer-by-layer assembly method. The films are characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scan electron microscopy (SEM), UV-vis spectrophotometry and fluorescence spectrophotometry. The results show that TiO2 phase transformation from anatase to rutile is promoted with higher dopant concentration. The surface oxygen vacancies (SOVs) of Mo-doped TiO2 films bind photoinduced electrons to further give rise to new photoluminescence (PL) signals, and the intensities of PL signals are in proportion to SOVs content of the films. The photocatalytic activity of TiO2 film is evaluated by measuring H2 evolution from water and the effects of SOVs of Mo-doped TiO2 films on photocatalytic processes are investigated along with their inherent relationships.

Structural and morphological control of Mo doped titania films

A facile and template-free layer-by-layer assembly-based method can be employed to synthesize structurally and morphologically controllable Mo-doped TiO2 films which demonstrate promising photoactivity.