FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W811421625> ?p ?o ?g. }

• W811421625 endingPage "19" @default.
• W811421625 startingPage "3" @default.
• W811421625 abstract "Ceria-based materials are utilized as automotive exhaust catalysts for the removal of noxious compounds, as catalysts for reforming ethanol and methane to produce hydrogen in fuel cells, as materials for solar-energy-to-fuel conversion, and as cathode, anode, and electrolyte materials in solid oxide fuel cells (SOFCs). The present paper is a critical review on the atomic-scale characterization of oxide-ion diffusion pathway, the existing phases, the phase transformations, “metastable” and stable phase diagrams, and oxygen storage capacity (OSC) of ceria-based materials. “Metastable,” compositionally (x) homogeneous t′- and t″-ceria–zirconia CexZr1–xO2 solid solutions (0.2 < x < 0.9) are key materials to obtain a high OSC, leading to high catalytic activity. Here, the t′- and t″-forms are unstable compared to the two-phase mixture of stable ZrO2-rich tetragonal and CeO2-rich cubic (or t″) phases, but are stable in the partitionless, compositionally homogeneous phases. The axial ratio, c/aF where the subscript F represents the pseudo-fluorite lattice, of the t′-form is larger than unity, while the c/aF ratio of the t″-form equals unity. Formation of the t′- and t″-CexZr1–xO2 is depicted in the “metastable” phase diagram consisting of allotropic phase boundaries in the CeO2–ZrO2 system and is explained using the schematic Gibbs energy–composition (G–x) diagram. The composition (CeO2 content x)-induced t′–t″ transition in CexZr1–xO2 is discrete and of first order. The c–t″ phase transition of CexZr1–xO2 is induced by the oxygen displacement from the regular fluorite position 1/4,1/4,1/4 along the c-axis. The c–t″ transition is continuous and might be of higher order. The c–t″ phase boundary at room temperature is located at around x = 0.85–0.9 in both bulk and nanocrystalline CexZr1–xO2. The tetragonal symmetry of compositionally homogeneous nano-sized Ce0.5Zr0.5O2 in air is retained up to 1176 K. The c/aF ratio, and the oxygen displacement are smaller in the nanocrystalline Ce0.5Zr0.5O2 than in bulk Ce0.5Zr0.5O2. Bulk oxide-ion diffusion is an important step of oxygen storage and release in ceria-based catalysts, and the oxide-ion diffusivity is essential for high OSC and efficiency of the SOFCs and the solar-energy-to-fuel conversion. The present paper reviews the atomic-scale characterization of ion diffusion in ceria-based catalysts and fluorite-type ionic conductors and discusses the correlation between their bulk ion diffusivity and structural properties. The spatial distributions of neutron scattering length density, bond valence sum (BVS), and bond-valence-based energy (BVE) in the unit cell of tetragonal ceria–zirconia compounds, cubic fluorite-type ceria-based materials, and other fluorite-structured compounds such as Ce0.5Zr0.5O2, CeO2, ceria–yttria Ce0.97Y0.07O1.96, bismuth oxide solid solution δ-Bi1.4Yb0.6O3, and copper iodide α-CuI indicate the three-dimensional network of curved 〈1 0 0〉F ion diffusion pathways and anisotropic 〈1 1 1〉F thermal vibration of mobile ions, which are responsible for the bulk ion diffusion and conduction. Here, the subscript F denotes the pseudo-fluorite lattice. The BVE distributions of Ce0.5Zr0.5O2 and CeO2 indicate lower activation energy and higher mobility of oxide ions in Ce0.5Zr0.5O2 compared with CeO2." @default.
• W811421625 created "2016-06-24" @default.
• W811421625 creator A5036081265 @default.
• W811421625 date "2015-09-01" @default.
• W811421625 modified "2023-10-14" @default.
• W811421625 title "Invited Review: Some recent developments in the atomic-scale characterization of structural and transport properties of ceria-based catalysts and ionic conductors" @default.
• W811421625 cites W1010959989 @default.
• W811421625 cites W113927861 @default.
• W811421625 cites W1544656587 @default.
• W811421625 cites W1612118758 @default.
• W811421625 cites W1619315203 @default.
• W811421625 cites W1637003851 @default.
• W811421625 cites W1638712113 @default.
• W811421625 cites W1847592551 @default.
• W811421625 cites W1964912153 @default.
• W811421625 cites W1966445019 @default.
• W811421625 cites W1970518959 @default.
• W811421625 cites W1971200136 @default.
• W811421625 cites W1971273014 @default.
• W811421625 cites W1972303682 @default.
• W811421625 cites W1976296761 @default.
• W811421625 cites W1977228332 @default.
• W811421625 cites W1978399858 @default.
• W811421625 cites W1981439940 @default.
• W811421625 cites W1982578201 @default.
• W811421625 cites W1984020769 @default.
• W811421625 cites W1985032599 @default.
• W811421625 cites W1992333362 @default.
• W811421625 cites W1992438756 @default.
• W811421625 cites W2000346195 @default.
• W811421625 cites W2001538233 @default.
• W811421625 cites W2011146136 @default.
• W811421625 cites W2012589437 @default.
• W811421625 cites W2015318144 @default.
• W811421625 cites W2020055216 @default.
• W811421625 cites W2025335768 @default.
• W811421625 cites W2028056984 @default.
• W811421625 cites W2029684519 @default.
• W811421625 cites W2034699912 @default.
• W811421625 cites W2035317120 @default.
• W811421625 cites W2037387381 @default.
• W811421625 cites W2037856151 @default.
• W811421625 cites W2038824481 @default.
• W811421625 cites W2040817647 @default.
• W811421625 cites W2045923474 @default.
• W811421625 cites W2046860043 @default.
• W811421625 cites W2048433095 @default.
• W811421625 cites W2049117402 @default.
• W811421625 cites W2055288543 @default.
• W811421625 cites W2055628911 @default.
• W811421625 cites W2056545651 @default.
• W811421625 cites W2057647471 @default.
• W811421625 cites W2063752296 @default.
• W811421625 cites W2065335538 @default.
• W811421625 cites W2067247540 @default.
• W811421625 cites W2068105935 @default.
• W811421625 cites W2071566978 @default.
• W811421625 cites W2074266812 @default.
• W811421625 cites W2075946504 @default.
• W811421625 cites W2076410283 @default.
• W811421625 cites W2078189290 @default.
• W811421625 cites W2079095846 @default.
• W811421625 cites W2079607738 @default.
• W811421625 cites W2083012158 @default.
• W811421625 cites W2083209440 @default.
• W811421625 cites W2084733383 @default.
• W811421625 cites W2085616868 @default.
• W811421625 cites W2085769100 @default.
• W811421625 cites W2085815533 @default.
• W811421625 cites W2090360347 @default.
• W811421625 cites W2090391232 @default.
• W811421625 cites W2090551774 @default.
• W811421625 cites W2091106642 @default.
• W811421625 cites W2093971207 @default.
• W811421625 cites W2102376932 @default.
• W811421625 cites W2106488885 @default.
• W811421625 cites W2116958075 @default.
• W811421625 cites W2124668526 @default.
• W811421625 cites W2126513713 @default.
• W811421625 cites W2131802000 @default.
• W811421625 cites W2132221912 @default.
• W811421625 cites W2137015596 @default.
• W811421625 cites W2137318752 @default.
• W811421625 cites W2140786466 @default.
• W811421625 cites W2148525942 @default.
• W811421625 cites W2150639153 @default.
• W811421625 cites W2152902542 @default.
• W811421625 cites W2153036513 @default.
• W811421625 cites W2167590372 @default.
• W811421625 cites W2315380829 @default.
• W811421625 cites W2316931446 @default.
• W811421625 cites W2318339659 @default.
• W811421625 cites W2319724736 @default.
• W811421625 cites W2320505366 @default.
• W811421625 cites W2330896618 @default.
• W811421625 cites W2331231970 @default.
• W811421625 cites W2738780677 @default.
• W811421625 cites W2950986576 @default.

• next