Aging of Single‐Crystal TiO2 Rutile Electrodes

Kiwiet, N.J.; Fox, Marye Anne

doi:10.1149/1.2086507

Cited by 9 publications

(3 citation statements)

References 28 publications

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“…This consists in the reorganization of the crystal lattice during operation resulting in the leaching of the dopant metal out of the crystal framework. [43][44][45] The problem of corrosion mainly affects the stability and durability of the photocatalyst.…”

Section: Doping Of Titaniamentioning

confidence: 99%

Photocatalytic CO2 reduction by TiO2 and related titanium containing solids

Dhakshinamoorthy

Navalón

Corma

et al. 2012

Energy Environ. Sci.

517

324

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The shortage of fossil fuels and the need to find alternative renewable and sustainable fuels for transportation are triggering an increasing interest in the photocatalytic reduction of CO 2 . In this review, we have focused on titanium containing photocatalysts that effect the reduction of CO 2 to fuels. The various products that are more generally formed are CH 4 , CH 3 OH, CO as well as HCOOH. This review has been organized primarily depending on the type of titanium material used as the photocatalyst. The list includes pure TiO 2 as well as metal-and non metal-doped titania, noble metals supported on titania and micro-/mesoporous titanosilicates or porous matrices containing titania clusters. In a general introduction we comment on the limitations of the current approaches and the various possibilities and conditions for performing the irradiation. In a final section, we also give our view on future developments and open issues to be addressed in this field.

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Section: Doping Of Titaniamentioning

confidence: 99%

Photocatalytic CO2 reduction by TiO2 and related titanium containing solids

Dhakshinamoorthy

Navalón

Corma

et al. 2012

Energy Environ. Sci.

517

324

View full text Add to dashboard Cite

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“…A number of studies have been made on the mechanism of the water-photooxidation reaction on single-crystal [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and powdered 18 TiO 2 systems, using various methods including in situ photoluminescence (PL) 5,7,[15][16][17] and electron spin resonance 18 measurements. However, reported mechanisms are still rather scattered and the detailed molecular mechanism has not been clarified yet.…”

Section: Introductionmentioning

confidence: 99%

Selective Formation of Nanoholes with (100)-Face Walls by Photoetching of n-TiO₂ (Rutile) Electrodes, Accompanied by Increases in Water-Oxidation Photocurrent

et al. 2000

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Nanometer-sized rectangular holes or grooves in the 〈001〉 direction were formed when single-crystal rutiletype n-TiO 2 (001), (110), and (100) electrodes were illuminated in 0.05 M H 2 SO 4 under anodic bias, accompanied by increases in water-oxidation photocurrents. Interestingly, only the (100) face was selectively exposed at the walls of the photoproduced holes and grooves, irrespective of crystal faces of electrode surfaces, though the (110) face for rutile TiO 2 is known to be the thermodynamically most stable, that is, to have the lowest surface Gibbs energy. On the other hand, no (100) face was exposed at the walls of rectangular holes produced by chemical etching with hot H 2 SO 4 and hydrogen reduction at elevated temperatures, indicating that the selective exposition of the (100) face is characteristic of photoetching in H 2 SO 4 . A possible explanation is given by assuming that the selective exposition of the (100) face is due to a kinetics-controlled mechanism. It is tentatively suggested that the photoetching, which makes the surface structure changeable, may be much slower than the water photooxidation at the (100) surface, though not so much slower at other surfaces such as ( 110) and ( 001).

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“…In this respect, the mechanism of photooxidation reaction of water on an n -TiO 2 electrode is interesting. A number of studies − have been made on the reaction, and it has been assumed in most cases that the reaction is initiated by the oxidation of surface Ti−OH group by photogenerated holes. On the other hand, we found previously that the n -TiO 2 (rutile) electrode showed a photoluminescence (PL) band peaked at 840 nm, which could be explained as arising from a surface reaction intermediate or a species closely related to it …”

Section: Introductionmentioning

confidence: 99%

Photoluminescence from a Bulk Defect near the Surface of an n-TiO₂ (Rutile) Electrode in Relation to an Intermediate of Photooxidation Reaction of Water

et al. 1997

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A photoluminescence (PL) band peaked at 840 nm is observed for an n-TiO2 (rutile) electrode in aqueous electrolyte solutions when illuminated under a slight anodic bias and was previously explained as arising from an intermediate of photooxidation reaction of water on the n-TiO2 electrode. The chemical structure and properties of the PL-emitting species have been investigated in the present work by measurements of photocurrent, photoluminescence, electroluminescence, and transient luminescence as well as inspection of the electrode surface by transmission electron microscopy. It is concluded that the PL band should be assigned to an electronic transition from the conduction band to the vacant level of HO• radicals present in a bulk defect (atomic gaps) near the n-TiO2 (rutile) surface and that the radicals act as an intermediate of the photooxidation reaction of water. The results give confirmative evidence to our previously proposed new mechanism that the surface Ti−OH group cannot be oxidized by photogenerated holes, and thus the reaction in acidic solutions is initiated by the oxidation of Ti−OH or OH- in the bulk defect near the surface.

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Aging of Single‐Crystal TiO2 Rutile Electrodes

Cited by 9 publications

References 28 publications

Photocatalytic CO2 reduction by TiO2 and related titanium containing solids

Photocatalytic CO2 reduction by TiO2 and related titanium containing solids

Selective Formation of Nanoholes with (100)-Face Walls by Photoetching of n-TiO₂ (Rutile) Electrodes, Accompanied by Increases in Water-Oxidation Photocurrent

Photoluminescence from a Bulk Defect near the Surface of an n-TiO₂ (Rutile) Electrode in Relation to an Intermediate of Photooxidation Reaction of Water

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Aging of Single‐Crystal TiO2 Rutile Electrodes

Cited by 9 publications

References 28 publications

Photocatalytic CO2 reduction by TiO2 and related titanium containing solids

Photocatalytic CO2 reduction by TiO2 and related titanium containing solids

Selective Formation of Nanoholes with (100)-Face Walls by Photoetching of n-TiO2 (Rutile) Electrodes, Accompanied by Increases in Water-Oxidation Photocurrent

Photoluminescence from a Bulk Defect near the Surface of an n-TiO2 (Rutile) Electrode in Relation to an Intermediate of Photooxidation Reaction of Water

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Product

Resources

About

Selective Formation of Nanoholes with (100)-Face Walls by Photoetching of n-TiO₂ (Rutile) Electrodes, Accompanied by Increases in Water-Oxidation Photocurrent

Photoluminescence from a Bulk Defect near the Surface of an n-TiO₂ (Rutile) Electrode in Relation to an Intermediate of Photooxidation Reaction of Water