Characteristics of Ni 8�wt%-doped titanium dioxide photocatalyst synthesized by mechanical alloying

Abstract

Nanocrystalline Ni 8 wt% doped TiO 2 powder was synthesized by mechanical alloying. Microstructural and photospectrometiric analysis showed that the Ni added up to 8 wt% was dissolved into the rutile TiO 2 matrix. The absorption threshold of the Ni doped powder shifted from 380 to 500 into the visible light region. (480-500 nm)

The photocatalytic activity of 2.5wt% Cu-doped TiO2 nano powders synthesized by mechanical alloying

“…Emission peak of the Cu-doped powders were detected at 448 nm (=2.76 eV, c) and at 444 nm (=2.79 eV, d). The shift of emission peak may due to the new absorption that was induced by localization of the trapping level near the valence band or conduction band [13].…”

Synthesis of Novel TiO2 by Mechanical Alloying and Heat Treatment-derived Nanocomposite of TiO2 and NiTiO3

“…In our previous study, nanocrystalline Ni-doped rutile TiO 2 synthesized by mechanical alloying (MA) and HPPLT (Homogeneous Precipitation Process at Low Temperatures) exhibited an absorption threshold in the range of 480-500 nm [8]. However, this is a very small region in the visible light spectrum.…”

Efficient photocatalytic hydrogen production over Ni@C/TiO2 nanocomposite under visible light irradiation

“…Moreover, various noble metal species such as Pt and RuO 2 have been used in most cases as cocatalysts to promote H 2 production by reducing the over-potential loss [3,4], but many meaningful endeavours have focused on developing photocatalysts with nonnoble metals (e.g. Ni) as cocatalyst [5,6].…”

“…Our previous researches have shown especially chemical and thermal stability when ferromagnetic metal (such as Fe, Co and Ni) was coated with carbon [8], these carbon-coated ferromagnetic metal (denoted as metal@C) materials have been used as high-density magnetic recording media, magnetically separable catalysts and biomedical applications for years [9][10][11]. It is reasonable to expect that Ni@C/TiO 2 nanocomposite photocatalyst would enhance the visible light response and photocatalytic activity for H 2 production due to the synergistic effect of suppression of the recombination of photogenerated carriers and photosensitization just like the abovementioned MWCNTs/TiO 2 , and the carbon-coated Ni nanocrystallites can act as cocatalyst [5,6], whereas less work has been done on the photocatalytic H 2 production, which is thought to be one of the best approaches for obtaining clean and sustainable energy [1][2][3][4]. To the best of our knowledge, for the first time in this Letter we employed a facile hydrothermal process to fabricate a novel nanocomposite containing TiO 2 and Ni@C in situ through a surfactant-mediated templating route [7,12].…”