Effect of chromium doping on the electrical and catalytic properties of powder titania under UV and visible illumination

Herrmann, Jean-Marie; Disdier, Jean; Pichat, Pierre

doi:10.1016/0009-2614(84)85067-8

Cited by 257 publications

(143 citation statements)

References 26 publications

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“…Other factors are also important such as the crystallinity and particle size of the material and the ability of the material to retard the electron-hole recombination process [50][51][52][53][58][59][60].…”

Section: Resultsmentioning

confidence: 99%

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Neville¹,

Mattle

Loughrey³

et al. 2012

J. Phys. Chem. C

118

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A series of C-doped, W-doped, and C,W-codoped TiO2 samples have been prepared using modified sol–gel techniques. Reproducible inexpensive C-doping arises from the presence of melamine borate in a sol–gel mixture, whereas W-doping is from the addition of tungstic acid to the sol. The materials have been characterized using elemental analysis, N2 physisorption (BET), thermogravimetric analysis, X-ray diffraction, Raman, X-ray photoelectron, UV–vis spectroscopies, and photocatalytic activity measurements. Doping C and W independently results in an increased absorbance in the visible region of the spectrum with a synergistic effect in increased absorbance when both elements are codoped. The increased visible-light absorbance of the W-doped or codoped materials is not reflected in photocatalytic activity. Visible-light-induced photocatalytic activity of C-doped material was superior to that of an undoped catalyst, paving the way for its application under only visible-light irradiation conditions. A significant fraction of the spectral red shift commonly observed with doped catalysts might be due to the formation of color centers as a result of defects associated with oxygen vacancies, and bandgap-related narrowing or intragap localization of dopant levels are not the only factors responsible for enhanced visible-light absorption in doped photocatalysts. Furthermore, bandgap narrowing through increases in the energy of the valence band may actually decrease photo-oxidation activity through a curtailment of one route of oxidation.

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Section: Resultsmentioning

confidence: 99%

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Neville¹,

Mattle

Loughrey³

et al. 2012

J. Phys. Chem. C

118

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“…Many researchers study the fabrication and photoreactivity of Vis-responsive thin films by physical and/or chemical modification of anatase films because of the importance of Visphotoreactive materials [53][54][55][56][57][58][59][60][61]. However, there is little information on the enhancement of UV sensitivity of Vis-responsive anatase films.…”

Section: Vis-responsive Anatase Thin Film Fabricated Using the Mpmmentioning

confidence: 99%

Heat Treatment in Molecular Precursor Method for Fabricating Metal Oxide Thin Films

Nagai¹,

Sato²

2012

Heat Treatment - Conventional and Novel Applications

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“…To extend its photon absorption edge to the visible-light region, it is necessary to improve the photocatalytic efficiency, and many experiments have been performed to dope impurity atoms into the TiO 2 lattice in an attempt to narrow the band gap and to improve the efficiency. Both mono-and co-doping by metal and non-metal elements have been reported [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

First‐principles calculation of electronic structure of V‐doped anatase TiO₂

Long

English

2010

ChemPhysChem

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The energetic and electronic structures of V‐doped anatase TiO2 have been investigated systematically by the GGA+U approach, including replacement of Ti by V in the absence and presence of oxygen vacancies and the presence of an interstitial site. It was found that V should exist as a V4+ ion in the replacement of Ti in the anatase lattice, the electron transitions of which to the conduction band from V 3d states are responsible for the experimentally observed visible light absorption. The influence of V dopant concentration on the electronic and magnetic properties is also discussed, such as the influence of the U value in systems containing oxygen vacancies and spin flip phenomena for interstitial V‐doping.

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Effect of chromium doping on the electrical and catalytic properties of powder titania under UV and visible illumination

Cited by 257 publications

References 26 publications

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Heat Treatment in Molecular Precursor Method for Fabricating Metal Oxide Thin Films

First‐principles calculation of electronic structure of V‐doped anatase TiO₂

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Effect of chromium doping on the electrical and catalytic properties of powder titania under UV and visible illumination

Cited by 257 publications

References 26 publications

Carbon-Doped TiO2 and Carbon, Tungsten-Codoped TiO2 through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Carbon-Doped TiO2 and Carbon, Tungsten-Codoped TiO2 through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Heat Treatment in Molecular Precursor Method for Fabricating Metal Oxide Thin Films

First‐principles calculation of electronic structure of V‐doped anatase TiO2

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Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

First‐principles calculation of electronic structure of V‐doped anatase TiO₂