The solid–solid interface: Explaining the high and unique photocatalytic reactivity of TiO2-based nanocomposite materials

Li, Gonghu; Gray, Kimberly A.

doi:10.1016/j.chemphys.2007.05.023

Cited by 287 publications

(143 citation statements)

References 190 publications

(237 reference 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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“…By contrast, the brookite phase or anatase-brookite mixed phase is much less studied as a photocatalyst for CO 2 photoreduction, probably due to the previous difficulty in synthesizing high quality brookite nanocrystallites. The studies on pure phase TiO 2 show that anatase phase is more photocatalytically active than rutile, possibly attributed to the combined effect of lower recombination rate of electronhole pairs and higher surface adsorptive capacity (Hurum et al, 2003;Li and Gray, 2007;He et al, 2012). Recently, the much less studied brookite phase was found to have a catalytic activity similar to anatase but higher than rutile for CO 2 photoreduction with H 2 O .…”

Section: Effect Of Crystal Phasementioning

confidence: 99%

Understanding the Reaction Mechanism of Photocatalytic Reduction of CO2 with H2O on TiO2-Based Photocatalysts: A Review

Liu

2014

Aerosol Air Qual. Res.

308

217

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Recently, there has been an increasing interest in the research of photocatalytic reduction of CO 2 with H 2 O, an innovative way to simultaneously reduce the level of CO 2 emissions and produce renewable and sustainable fuels. Titanium dioxide (TiO 2 ) and modified TiO 2 composites are the most widely used photocatalysts in this application; however, the reaction mechanism of CO 2 photoreduction on TiO 2 photocatalysts is still not very clear, and the reaction intermediates and product selectivity are not well understood. This review aims to summarize the recent advances in the exploration of reaction mechanism of CO 2 photoreduction with H 2 O in correlation with the TiO 2 photocatalyst characteristics. Discussions are provided in the following sections: (1) CO 2 adsorption, activation and dissociation on TiO 2 photocatalyst; (2) mechanism and approaches to enhance charge transfer from photocatalyst to reactants (i.e., CO 2 and H 2 O); and (3) surface intermediates, reaction pathways, and product selectivity. In each section, the effects of material properties are discussed, including TiO 2 crystal phases (e.g., anatase, rutile, brookite, or their mixtures), surface defects (e.g., oxygen vacancy and Ti 3+) and material modifications (e.g., incorporation of noble metal, metal oxide, and/or nonmetal species to TiO 2 ). Finally, perspectives on future research directions and open issues to be addressed in CO 2 photoreduction are outlined in this review paper.

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“…Li et al [48] contended that adlineation at solid-solid interfaces is one of the most important factors for effective interfacial charge transfer and improved photocatalytic activity. Some researchers [49,50] reported that the conduction band of TiO 2 (A) is about 0.2 eV higher Table 3 Crystallite size, rutile content in the bulk and surface region, and specific surface area of La2O3-TiO2-900 • C samples derived from XRD, UV Raman spectra, and N2-adsorption.…”

Section: Evaluation Of Photocatalytic Activitymentioning

confidence: 99%

Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase

Zhang

Shi

Zhao

et al. 2013

Applied Surface Science

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The solid–solid interface: Explaining the high and unique photocatalytic reactivity of TiO2-based nanocomposite materials

Cited by 287 publications

References 190 publications

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

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

Understanding the Reaction Mechanism of Photocatalytic Reduction of CO2 with H2O on TiO2-Based Photocatalysts: A Review

Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase

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