Solvated Electrons on Metal Oxide Surfaces

Zhao, Jin; Li, Bin; Onda, Ken; Feng, Min; Petek, Hrvoje

doi:10.1021/cr050173c

Cited by 136 publications

(151 citation statements)

References 264 publications

(966 reference statements)

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“…48 Methods for the preparation of TiO 2 (110) surfaces in ultrahigh vacuum (UHV) conditions are also well established 48,50,51 and this surface has become a prototype for metal oxides. 48,49,51,[52][53][54][55][56] Fig . 6 shows a model of the structure of the TiO 2 (110)-(1 Â 1) surface.…”

Section: Photocatalysis Of Methanol On Tio 2 (110)mentioning

confidence: 99%

“…Therefore, the physical and chemical properties of methanol on TiO 2 (110) have been examined in detail both experimentally 29,53,62,[73][74][75][76][77][78][79] and theoretically [80][81][82][83][84] to probe the active sites and relevant reactive structures. Despite this extraordinary effort, central questions remain unresolved, for example, how methanol enhances the photocatalysis of water or how it is eventually photodegraded on TiO 2 .…”

Section: Photocatalysis Of Methanol On Tio 2 (110)mentioning

confidence: 99%

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Surface photochemistry probed by two-photon photoemission spectroscopy

Zhou

Ren

et al. 2012

Energy Environ. Sci.

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Two-photon photoemission (2PPE) has been widely used in the study of electronic structure and dynamics of unoccupied electronic states on different types of surfaces and interfaces. Since 2PPE probes electronically excited states, it should be sensitive to surface excited electronic structure changes that accompany surface chemical reactions. Therefore, this method could potentially be used to study the kinetics and dynamics of surface chemical reactions as well as surface photocatalysis. In this article, we briefly review recent progress made in the study of surface photochemistry and photocatalysis using the time-dependent 2PPE (TD-2PPE) method. A few examples are given to demonstrate the application of this method in probing surface photochemistry and photocatalysis, particularly photocatalysis of methanol on TiO 2 surfaces. Since many problems associated with surface photochemistry and surface photocatalysis are related to energy and environmental issues, the 2PPE technique could have important applications in the study of the fundamental problems in energy and environmental sciences.

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Section: Photocatalysis Of Methanol On Tio 2 (110)mentioning

confidence: 99%

Section: Photocatalysis Of Methanol On Tio 2 (110)mentioning

confidence: 99%

Surface photochemistry probed by two-photon photoemission spectroscopy

Zhou

Ren

et al. 2012

Energy Environ. Sci.

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“…15,16 UHV studies of electron population dynamics, energy relaxation, band structure and localization phenomena are commonplace for a large variety of metal-dielectric interfaces using two-photon photoemission (2PPE). [17][18][19][20][21] 2PPE can access interfacial electronic states and track the dielectric response of adsorbed thin films. A sub-hundred femtosecond pulse and its second harmonic impinge upon an Ag substrate with a controllable time delay of femtoseconds to picoseconds between pulses.…”

Section: Introductionmentioning

confidence: 99%

The Ultrafast Dynamics of Image Potential State Electrons at the Dimethylsulfoxide/Ag(111) Interface

et al. 2008

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Angle-resolved two-photon photoemission was used to study the energy relaxation, population decay and localization dynamics of image potential state (IPS) electrons in ultrathin films of dimethylsulfoxide (DMSO) on an Ag(111) substrate. Dynamic energy shifts of 50 ± 10 meV and 220 ± 10 meV were observed for n=1 IPS electrons at one monolayer and two monolayer coverages of DMSO, respectively. The difference in energy shifts is attributed to rotational hindrance of the molecular dipole in the chemisorptive first monolayer. The finding confirms the proposed mechanism for the low differential capacitance of dimethylsulfoxide at noble metal interfaces in solution. A novel description of the IPS as a surface capacitance is presented to facilitate comparisons with electrochemical systems.

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“…Moreover, even for surfaces with similar structure, the acid / base character of the surface can have a strong effect on whether the molecules adsorb associatively or dissociatively. Thus, specific interactions between the adsorbate and substrate can have a strong influence on the interfacial electronic structure and charge-transfer dynamics on metal oxide surfaces [17]. …”

Section: Catalysts Characterizationmentioning

confidence: 99%

Selectivity in photocatalysis by particulate semiconductors

Karunakaran

Dhanalakshmi

2009

Open Chemistry

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o -n i t r o p h e n o l , p -n i t r o p h e n o l , o -a m i n o p h e n o l , m-aminophenol, p-aminophenol, catechol, resorcinol and quinol were set at 259 and 300, 267 and 302, 266 and 304, 266 and 311, 263 and 300, 264 and 300, 270 and 312, 268 and 300, 306 and 352, 274 and 357, 272 and 343, 275 and 357, 265 and 310, 263 and 304 and 279 and 328 nm, respectively. The photodegradation results were reproducible to ± 5%. The dissolved O 2 was measured using an Elico dissolved oxygen analyzer PE 135, the UV-visible spectral studies were made with a UV-1650 Shimadzu spectrophotometer, the fluorescence was measured with an Elico SL 174 spectrofluorimeter and an Avatar 330 FT-IR spectrometer was used to record the infrared spectra. The diffuse reflectance spectra of the semiconductors were recorded using a UV-VIS-NIR Varian-Cary 5E spectrometer.

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Solvated Electrons on Metal Oxide Surfaces

Cited by 136 publications

References 264 publications

Surface photochemistry probed by two-photon photoemission spectroscopy

Surface photochemistry probed by two-photon photoemission spectroscopy

The Ultrafast Dynamics of Image Potential State Electrons at the Dimethylsulfoxide/Ag(111) Interface

Selectivity in photocatalysis by particulate semiconductors

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