Microporous Ni-Doped TiO₂ film Photocatalyst by Plasma Electrolytic Oxidation

Abstract

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.

Passivation of defect states in anatase TiO2 hollow spheres with Mg doping: Realizing efficient photocatalytic overall water splitting

“…Introducing heterogeneous elements in TiO 2 have been shown to produce more defect states [38,39]. We also synthesized the TiO 2 hollow spheres doped with Ni, Cr elements.…”

Investigation of nitrogen doped and carbon species decorated TiO2 with enhanced visible light photocatalytic activity by using chitosan

“…Doping is thought as the most common and accessible method in deed. Metal elements like Fe, Co, Ni, Mn or V as dopants can efficiently improve the visible light photocatalytic activity of TiO 2 [11][12][13][14][15]. However, the low thermal stability and the increased electron-hole recombination sites by the dopants hinder its further development [16].…”

Lanthanum‐Doped TiO2 Nanosheet Film with Highly Reactive {001} Facets and Its Enhanced Photocatalytic Activity

“…O 2 -+ dye (MO or MB) → degraded products (8) · OH + dyes (MO or MB) → degraded products (9) Full Paper…”

“…[4][5][6] To solve these problems, many recent studies have investigated the immobilization of TiO 2 nanoparticles on a solid carrier and the variation of their electronic structure through doping with metallic and nonmetallic elements. [4,[7][8][9] Recently, La doping has become highly promising because [10][11][12][13] it can (1) reduce electron-hole pair recombination owing to the 4f electron configuration of La and (2) promote the chemical adsorption of organic substrates on the TiO 2 crystal surfaces.…”