Surface Science Studies of the Photoactivation of TiO<sub>2</sub> — New Photochemical Processes

Thompson, Tracy; Yates, John T.

doi:10.1002/chin.200701224

Cited by 224 publications

(307 citation statements)

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“…A significant amount of research on TiO 2 has been performed over the last five decades and a number of reviews on various aspects of TiO 2 have been published [12,[23][24][25][26][27][28] to understand and summarize the progress in this field. In the present review, the properties of TiO 2 that make it suitable to act as a photocatalyst and various methods including dye sensitization, doping, coupling and capping that are used to improve its efficiency are discussed.…”

Section: Historical Backgroundmentioning

confidence: 99%

“…The TiO 6 octahedron is slightly distorted [25][26][27]. The rutile phase is stable at most temperatures and pressures up to 60 kbar, where TiO 2 (II) becomes the thermodynamically favorable phase [34].…”

Section: Chemical Structure Of Tiomentioning

confidence: 99%

“…Its unit cell is composed of 8 formula units of TiO 2 and is formed by edge-sharing TiO 6 octahedra ( Figure 2). It is more complicated, has a larger cell volume and is also the least dense of the 3 forms and is not often used for experimental investigations [26].…”

Section: Chemical Structure Of Tiomentioning

confidence: 99%

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A review of TiO2 nanoparticles

2011

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Climate change and the consumption of non-renewable resources are considered as the greatest problems facing humankind. Because of this, photocatalysis research has been rapidly expanding. TiO 2 nanoparticles have been extensively investigated for photocatalytic applications including the decomposition of organic compounds and production of H 2 as a fuel using solar energy. This article reviews the structure and electronic properties of TiO 2 , compares TiO 2 with other common semiconductors used for photocatalytic applications and clarifies the advantages of using TiO 2 nanoparticles. TiO 2 is considered close to an ideal semiconductor for photocatalysis but possesses certain limitations such as poor absorption of visible radiation and rapid recombination of photogenerated electron/hole pairs. In this review article, various methods used to enhance the photocatalytic characteristics of TiO 2 including dye sensitization, doping, coupling and capping are discussed. Environmental and energy applications of TiO 2 , including photocatalytic treatment of wastewater, pesticide degradation and water splitting to produce hydrogen have been summarized. Historical backgroundThe growth of industry worldwide has tremendously increased the generation and accumulation of waste byproducts. In general, the production of useful products has been focused on and the generation of waste byproducts has been largely ignored. This has caused severe environmental problems that have become a major concern. Researchers all over the world have been working on various approaches to address this issue. Photoinduced processes have been studied and various applications have been developed. One important technique for removing industrial waste is the use of light energy (electromagnetic radiation) and particles sensitive to this energy to mineralize waste which aids in its removal from solution. Titanium dioxide (TiO 2 ) is considered very close to an ideal semiconductor for photocatalysis because of its high stability, low cost and safety toward both humans and the environment.*Corresponding author (email: shipra.mital@gmail.com)In 1964, Kato et al.[1] published their work on the photocatalytic oxidation of tetralin (1,2,3,4-tetrahydronaphthalene) by a TiO 2 suspension, which was followed by McLintock et al. [2] investigating the photocatalytic oxidation of ethylene and propylene in the presence of oxygen adsorbed on TiO 2 . However, the most important discovery that extensively promoted the field of photocatalysis was the "Honda-Fujishima Effect" first described by Fujishima and Honda in 1972 [3]. This well-known chemical phenomenon involves electrolysis of water, which is related to photocatalysis. Photoirradiation of a TiO 2 (rutile) single crystal electrode immersed in an aqueous electrolyte solution induced the evolution of oxygen from the TiO 2 electrode and the evolution of hydrogen from a platinum counterelectrode when an anodic bias was applied to the TiO 2 working electrode. In 1977, Frank and Bard [4] examined the reduction of ...

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Section: Historical Backgroundmentioning

confidence: 99%

Section: Chemical Structure Of Tiomentioning

confidence: 99%

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A review of TiO2 nanoparticles

2011

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“…However, for the most of stable metal oxides semiconductor photoanodes such as TiO 2 and ZnO, only ultraviolet light irradiation can be absorbed. Although some semiconductor photoanodes such as Fe 2 O 3 were reported to be able to absorb visible lights, their photocarrier utilization for oxidizing water is relatively low and their quantum efficiencies are usually lower than 10% at 1.23 V versus reversible hydrogen electrode (RHE) 7,8 . The architecture of vertically aligned nanotube arrays has shown considerate improvements to the quantum efficiencies of TiO 2 and Fe 2 O 3 photoanodes [9][10][11][12][13][14] , but the total conversion efficiency of visible lights is still not satisfactory.…”

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Aligned Fe2TiO5-containing nanotube arrays with low onset potential for visible-light water oxidation

et al. 2014

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There remains a pressing challenge in the efficient utilization of visible light in the photoelectrochemical applications of water splitting. Here, we design and fabricate pseudobrookite Fe 2 TiO 5 ultrathin layers grown on vertically aligned TiO 2 nanotube arrays that can enhance the conduction and utilization of photogenerated charge carriers. Our photoanodes are characterized by low onset potentials of B0.2 V, high photon-to-current efficiencies of 40-50% under 400-600 nm irradiation and total energy conversion efficiencies of B2.7%. The high performance of Fe 2 TiO 5 nanotube arrays can be attributed to the anisotropic charge carrier transportation and elongated charge carrier diffusion length (compared with those of conventional TiO 2 or Fe 2 O 3 photoanodes) based on electrochemical impedance analysis and first-principles calculations. The Fe 2 TiO 5 nanotube arrays may open up more opportunities in the design of efficient and low-cost photoanodes working in visible light for photoelectrochemical applications.

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“…It has been reported that controlling particle shape, geometry, size, surface morphology, electronic structure, relative abundance of anatase/rutile surface domains and the nature of the surface functional groups (such as OH) are some of the key factors for designing efficient TiO 2 photocatalytic architectures [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Thermal evolution of structure and photocatalytic activity in polymer microsphere templated TiO2 microbowls

Erdogan

Polat

Garifullin

et al. 2014

Applied Surface Science

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a b s t r a c tPolystyrene cross-linked divinyl benzene (PS-co-DVB) microspheres were used as an organic template in order to synthesize photocatalytic TiO 2 microspheres and microbowls. Photocatalytic activity of the microbowl surfaces were demonstrated both in the gas phase via photocatalytic NO(g) oxidation by O 2 (g) as well as in the liquid phase via Rhodamine B degradation. Thermal degradation mechanism of the polymer template and its direct influence on the TiO 2 crystal structure, surface morphology, composition, specific surface area and the gas/liquid phase photocatalytic activity data were discussed in detail. With increasing calcination temperatures, spherical polymer template first undergoes a glass transition, covering the TiO 2 film, followed by the complete decomposition of the organic template to yield TiO 2 exposed microbowl structures. TiO 2 microbowl systems calcined at 600 • C yielded the highest per-site basis photocatalytic activity. Crystallographic and electronic properties of the TiO 2 microsphere surfaces as well as their surface area play a crucial role in their ultimate photocatalytic activity. It was demonstrated that the polymer microsphere templated TiO 2 photocatalysts presented in the current work offer a promising and a versatile synthetic platform for photocatalytic DeNO x applications for air purification technologies.

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Surface Science Studies of the Photoactivation of TiO₂ — New Photochemical Processes

Abstract: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Cited by 224 publications

References 1 publication

A review of TiO2 nanoparticles

A review of TiO2 nanoparticles

Aligned Fe2TiO5-containing nanotube arrays with low onset potential for visible-light water oxidation

Thermal evolution of structure and photocatalytic activity in polymer microsphere templated TiO2 microbowls

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Surface Science Studies of the Photoactivation of TiO2 — New Photochemical Processes

Abstract: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Cited by 224 publications

References 1 publication

A review of TiO2 nanoparticles

A review of TiO2 nanoparticles

Aligned Fe2TiO5-containing nanotube arrays with low onset potential for visible-light water oxidation

Thermal evolution of structure and photocatalytic activity in polymer microsphere templated TiO2 microbowls

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Product

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Surface Science Studies of the Photoactivation of TiO₂ — New Photochemical Processes