Oxygen incorporation into strontium titanate single crystals from CO2 dissociation

Abstract

Oxygen incorporation from CO(2) into Fe-doped SrTiO(3)(100) single crystals (0.013 at% Fe, 0.039 at% Fe and 0.13 at% Fe) was investigated. Oxygen incorporation processes using (13)C(18)O(2) as the gas source were studied by isotope exchange depth profiling (IEDP) and subsequent secondary-ion mass spectroscopy (SIMS). The interaction of CO(2) with SrTiO(3) (100) surfaces was further studied with different surface analytical techniques like metastable induced electron spectroscopy (MIES), ultraviolet photoelectron spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS). Results indicate that CO(2) interaction with SrTiO(3) (100) surfaces does not change the surface at all. It seems that CO(2) provides a very low sticking probability on the surface as it is not traced by valence band spectroscopy even at room temperature. Nonetheless, (13)C(18)O(2) acts as an incorporation source of (18)O into the Fe-doped SrTiO(3) single crystals. The diffusion coefficient exhibits a peculiar behaviour when Fe concentration increases. No carbon incorporation is observed at all.

Hydrogen‐assisted Carbon Dioxide Thermochemical Reduction on La0.9Ca0.1FeO3−δ Membranes: A Kinetics Study

“…Two possible pathways have been proposed, involving either an oxygen atom from CO 2 incorporated as lattice oxygen, or CO 2 forming carbonate species . The oxygen direct‐incorporation pathway was revealed from isotope experiments on an Fe‐doped SrTiO 3 single‐crystal surface at 850–1000 °C as: …”

“…Twop ossible pathways have been proposed, involving either an oxygen atom from CO 2 incorporated as lattice oxygen, or CO 2 forming carbonate species. [24] The oxygen direct-incorporation pathway was revealed from isotope experiments on an Fe-doped SrTiO 3 single-crystal surface at 850-1000 8Cas: [37] CO 2 ðgÞ$COðgÞþO À ads þ h ð1Þ Steps for CO 2 thermochemical reduction on ap erovskite oxygen permeable membrane(OPM)w ith solar-heatu tilization as an example. Partial oxidation of methanei susedasa ne xample to illustrate the potentialof energy storage and chemicalco-production.…”

Phosphine-stabilised Au9 clusters interacting with titania and silica surfaces: The first evidence for the density of states signature of the support-immobilised cluster

“…Scanning tunnelling microscopy can be used for such studies in the case of ultra-pure systems but requires a support that is ideally of flat geometry. [31][32][33] Another method that can be applied is metastable induced electron spectroscopy (MIES), which is exclusively sensitive to the outermost layer of a sample 34,35 and is used to determine the electronic structure of the outermost layer. 36,37 The aim of the present work is to deposit chemically synthesised, atomically precise gold clusters on oxide surfaces and to determine the composition and electronic structure of the outermost layer after heat treatment under vacuum.…”

The interaction of CO2 and CO with Fe‐doped SrTiO3(100) surfaces

“…One possibility is the substitution of O 2 by CO 2 . It has already been shown with Isotope Exchange Depth Profiling (IEDP) and Temperature Programmed Desorption (TPD), that this is possible, most likely via the following pathway:13 …”