Role of Oxygen Vacancies in Water Vapor Chemisorption and CO Oxidation on Titania

A Study of Oxygen Vacancy Formation and Annihilation in Submonolayer Coverages of TiO2 Dispersed on MCM-48

“…Studies of oxygen vacancy formation in bulk TiO 2 suggest that surface vacancies are more stable than bulk vacancies and that vacancies can migrate from the bulk to the surface of the oxide. , However, only limited attempts have been made to quantify the surface concentration of O-atom defects. STM studies show that upon heating rutile in vacuum to 700−1100 K, the (110) surface of rutile can contain 2−10% O vacancies. ,− Vacancies are also formed in bulk TiO 2 powders by heating in vacuum or an inert atmosphere , or in a reducing gas. , …”

Influence of Lanthanum Doping on Structural and Electrical/Electrochemical Properties of Double Perovskite Sr2CoMoO6 as Anode Materials for Intermediate-Temperature Solid Oxide Fuel Cells

“…The O 1s core level spectra are fitted corresponding to three types of oxygen peaks, lattice oxygen, chemisorbed oxygen, and physisorbed oxygen. − From Figure (c), it was observed that the intensity signal of chemisorbed oxygen is stronger than that of lattice oxygen. The presence of chemisorbed oxygen at the surface could be attributed to defect correlation with dopant concentration and lattice oxygen associated to the formation of oxygen vacancies. , Zhao et al reported that oxygen vacancy formation and migration in double perovskite can be useful as an anode for SOFCs. The calculated percentage factors of lattice oxygen and chemisorbed oxygen given in Table indicate that the amount of chemisorbed oxygen is increased with a decrease in lattice oxygen.…”

“…The presence of chemisorbed oxygen at the surface could be attributed to defect correlation with dopant concentration and lattice oxygen associated to the formation of oxygen vacancies. 44,45 Zhao et al 46 reported that oxygen vacancy formation and migration in double perovskite can be useful as an anode for SOFCs. The calculated percentage factors of lattice oxygen and chemisorbed oxygen given in Table 2 indicate that the amount of chemisorbed oxygen is increased with a decrease in lattice oxygen.…”

Facile synthesis and visible photocatalytic activity of single-crystal TiO2/PbTiO3 heterostructured nanofiber composites

“…On the other hand, Kim et al 38 believed that the p-n diode formation in the CaFe 2 O 4 /PbBi 2 Nb 1.9 W 0.1 O 9 composite was the reason that led to the high visible-light catalytic performance. Considering that PbTiO 3 is a p-type semiconductor [39][40][41] and TiO 2 is n-type, 42,43 the possible formation of p-n junctions between the PTO and the TiO 2 phase could result in the formation of a space charge region and efficient separation of electron-hole pairs. The exact mechanism is not clear, and it will be explored in future work.…”