The surface science of titanium dioxide

Surface Science Studies of the Photoactivation of TiO2New Photochemical Processes

Steam Reforming and Graphite Formation on Ni Catalysts

Reference LPI-ARTICLE-1999-017View record in Web of Science Record created on 2006-02-21, modified on 2017-05-12

/pdf/metal-oxide-surfaces-and-their-interactions-with-aqueous-22jt31pax0.pdf

Metal Oxide Surfaces and Their Interactions with Aqueous Solutions and Microbial Organisms.

The structure of RuO(2)(110) and the mechanism for catalytic carbon monoxide oxidation on this surface were studied by low-energy electron diffraction, scanning tunneling microscopy, and density-functional calculations. The RuO(2)(110) surface exposes bridging oxygen atoms and ruthenium atoms not capped by oxygen. The latter act as coordinatively unsaturated sites-a hypothesis introduced long ago to account for the catalytic activity of oxide surfaces-onto which carbon monoxide can chemisorb and from where it can react with neighboring lattice-oxygen to carbon dioxide. Under steady-state conditions, the consumed lattice-oxygen is continuously restored by oxygen uptake from the gas phase. The results provide atomic-scale verification of a general mechanism originally proposed by Mars and van Krevelen in 1954 and are likely to be of general relevance for the mechanism of catalytic reactions at oxide surfaces.

https://science.sciencemag.org/content/sci/287/5457/1474.full.pdf

Atomic-scale structure and catalytic reactivity of the RuO(2)(110) surface

Surface x-ray diffraction has been used to determine the structural relaxations of ${\mathrm{TiO}}_{2}(110)\ensuremath{-}(1\ifmmode\times\else\texttimes\fi{}1)$. The magnitudes range from 0 to 0.27 \AA{}, leading to rumpling of the titanium planes. The data are compared to the results of three independent calculations of the energy minimized structure. Excellent agreement is achieved with the positions of titanium atoms predicted by Ramamoorthy et al. [Phys. Rev. B 49, 16 721 (1994)].

Relaxation of TiO 2 ( 110 ) -( 1 × 1 ) Using Surface X-Ray Diffraction

STM and SPA-LEED studies of O-induced structures on Rh(100) surfaces

The valence-band photoemission of the Rh(100)-c(2\ifmmode\times\else\texttimes\fi{}2)-O, Rh(100)-(2\ifmmode\times\else\texttimes\fi{}2)p4g-O, and Rh(100)- c(2\ifmmode\times\else\texttimes\fi{}2)-S surfaces has been investigated using an incident photon energy of 38 eV, along both the \ensuremath{\Gamma}X\ensuremath{'} and \ensuremath{\Gamma}M\ensuremath{'} directions. Local density of states calculations have also been performed for the c(2\ifmmode\times\else\texttimes\fi{}2)-O and c(2\ifmmode\times\else\texttimes\fi{}2)-S phases using density-functional theory. For each surface overlayer the angle-resolved photoemission measurements show significant differences in the dispersion of features with binding energies between 3 and 6 eV. These peaks are assigned with reference to the density of states calculations, and the origins of the differences in dispersion are discussed in relation to the different geometric structures.

Angle-resolved photoemission study of half-monolayer O and S structures on the Rh(100) surface

Structural study of Rh(100)-c(2 × 2)-S using the normal-incidence standing X-ray wavefield method

Removal of the clock reconstruction of Ni(100)-(2×2) p4g-N by coadsorption of K: A spot-profile-analysis low-energy-electron-diffraction and angle-resolved ultraviolet-photoemission-spectroscopy study

J. Mercer

Papers

Relaxation of TiO 2 ( 110 ) -( 1 × 1 ) Using Surface X-Ray Diffraction

STM and SPA-LEED studies of O-induced structures on Rh(100) surfaces

Angle-resolved photoemission study of half-monolayer O and S structures on the Rh(100) surface

Structural study of Rh(100)-c(2 × 2)-S using the normal-incidence standing X-ray wavefield method

Removal of the clock reconstruction of Ni(100)-(2×2) p4g-N by coadsorption of K: A spot-profile-analysis low-energy-electron-diffraction and angle-resolved ultraviolet-photoemission-spectroscopy study