A structural investigation of titanium dioxide photocatalysts

Bickley, R.I.; González-Carreño, T.; Lees, John S.; Palmisano, Leonardo; Tilley, R.J.D.

doi:10.1016/0022-4596(91)90255-g

Cited by 1,002 publications

(665 citation statements)

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“…We also find that the workfunction of the composite is reduced by around 1 eV compared to the bare surface, which will be important for enhanced reactivity. The importance of forming an interface between two materials 20 to enhance photocatalytic activity is discussed in the literature [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] and new materials combinations are being prepared, e.g. Ismail reported a synthesis of PdO-TiO 2 nanocomposite through one-step sol-gel reaction with enhanced photocatalytic activities 78 .…”

Section: Discussionmentioning

confidence: 99%

TiO2 nanocluster modified-rutile TiO2 photocatalyst: a first principles investigation

2013

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Access to the full text of the published version may require a subscription. The clusters adsorb strongly at the surface giving adsorption energies from -2.7 eV to -6.7 eV. The resulting structures show a large number of new Ti-O bonds created between the cluster and the surface, so that the new bonds enhance the stability. The electronic density of states (EDOS) shows that the valence band edge is shifted upwards, due to new nanocluster derived states in this region, while the conduction band is unchanged and composed of the Ti 3d states from the surface. This 20 reduces the band gap over bare TiO 2 , potentially shifting light absorption into the visible region. The valence and conduction band composition of these heterostructures will favour spatial separation of electrons and holes after light excitation, thus giving improved photocatalytic properties in these novel structures. Rights © The Royal Society of Chemistry 2013. This is the Accepted Manuscript version of a published work that appeared in final form25

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Section: Discussionmentioning

confidence: 99%

TiO2 nanocluster modified-rutile TiO2 photocatalyst: a first principles investigation

2013

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“…It is known that this support consists of anatase, rutile and amorphous material in intimate contact 34 . In some cases it has been shown that small rutile crystallites are interwoven with anatase crystallites and in some cases rutile forms a surface layer onto anatase crystallites 35 .…”

Section: Methodsmentioning

confidence: 99%

Sintering Behavior of TiO₂-Supported Model Cobalt Fischer–Tropsch Catalysts under H₂ Reducing Conditions and Elevated Temperature

Xaba

Villiers

2016

Ind. Eng. Chem. Res.

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ABSTRACT:The sintering of model TiO2-supported cobalt catalysts has been studied. The TiO2 supports used were anatase, P25 (85% anatase-15% rutile) and rutile. The catalysts were characterized at each stage of treatment. These treatment stages were calcination, reduction and sintering. It was found that the TiO2 support does not influence the Co3O4 crystallite and particle size as shown by powder x-ray diffraction (XRD) and transmission electron microscopy (TEM) respectively. The reduction of the cobalt catalysts and bare supports was studied by temperature programmed reduction (TPR). It was found that the bare supports were not as inert as expected. The supports showed minor reduction as seen in the H2 consumption. All the cobalt catalysts showed a two-step reduction. Sintering of anatase-supported cobalt was shown to be the most substantial with P25-and rutile-supported showing a lower sintering tendency; P25-supported cobalt being the most stable based on TEM measurements. Sintering kinetics based on the Generalized Power law Expression (GPLE) model, showed that sintering of anatase-supported cobalt is the most rapid with a large sintering rate constant. Sintering of P25-supported cobalt is the lowest, shown by the lowest sintering rate constant. The study has conclusively shown the effect of the catalyst support phase. The study has also shown that the use of high surface area supports is not necessarily the only answer to preventing sintering. The phase of the catalyst support is also important.

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“…8 This highly versatile material has found many applications in a variety of research areas of significance, including electronics, 9 photovoltaics, 10 photocatalysis 3 and photoelectrochemical conversion. [11][12][13] A prominent example is the use of the photocatalytic properties derived from TiO2 1,14 in the formation of photogenerated charge carriers (electron-hole pairs), which occur with the absorption of ultraviolet (UV) light. In addition, TiO2 is classified as a unique photocatalyst under light doping in both the visible and UV regions.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Carrier Trapping of a Metal-Doped Titanium Dioxide Semiconductor Revealed by Femtosecond Transient Absorption Spectroscopy

Sun

Yang

Khan

et al. 2014

ACS Appl. Mater. Interfaces

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A structural investigation of titanium dioxide photocatalysts

Cited by 1,002 publications

References 11 publications

TiO2 nanocluster modified-rutile TiO2 photocatalyst: a first principles investigation

TiO2 nanocluster modified-rutile TiO2 photocatalyst: a first principles investigation

Sintering Behavior of TiO₂-Supported Model Cobalt Fischer–Tropsch Catalysts under H₂ Reducing Conditions and Elevated Temperature

Ultrafast Carrier Trapping of a Metal-Doped Titanium Dioxide Semiconductor Revealed by Femtosecond Transient Absorption Spectroscopy

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A structural investigation of titanium dioxide photocatalysts

Cited by 1,002 publications

References 11 publications

TiO2 nanocluster modified-rutile TiO2 photocatalyst: a first principles investigation

TiO2 nanocluster modified-rutile TiO2 photocatalyst: a first principles investigation

Sintering Behavior of TiO2-Supported Model Cobalt Fischer–Tropsch Catalysts under H2 Reducing Conditions and Elevated Temperature

Ultrafast Carrier Trapping of a Metal-Doped Titanium Dioxide Semiconductor Revealed by Femtosecond Transient Absorption Spectroscopy

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Sintering Behavior of TiO₂-Supported Model Cobalt Fischer–Tropsch Catalysts under H₂ Reducing Conditions and Elevated Temperature