Structural aspects of the ionic conductivity of La1âxSrxCoO3âÎ´

Doorn, R.H.E. van; Burggraaf, A.J.

doi:10.1016/s0167-2738(99)00282-9

Cited by 151 publications

(78 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As shown in Table S1 †, both in-plane and out-of-plane strains of LSCF 113 films were not strongly influenced by the surface decoration, which is supported by the fact that the lattice constant of LSC 214 (a tetra. ≈ 3.819 Å for LSC 214 bulk [26] ) is very close to that of LSCF 113 (a pc ≈ 3.885 Å for the LSCF 113 bulk [27] ) and LSC 113 (a pc ≈ 3.854 Å for the LSC 113 bulk [28] ). This observation is further supported by our recent work, [14] where the LSC 214 decoration has no influence on the in-plane and out-of-plane strains of the epitaxial LSC 113 films at elevated temperatures.…”

supporting

confidence: 67%

Enhancement of oxygen surface exchange on epitaxial La0.6Sr0.4Co0.2Fe0.8O3-δ thin films using advanced heterostructured oxide interface engineering

Lee

Wang

et al. 2016

MRS Communications

View full text Add to dashboard Cite

Engineering of a novel heterostructured oxide interface was used to enhance the oxygen surface exchange kinetics of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF 113 ) thin films. A single-layer decoration of mixed (LaSr) 2 CoO 4±δ (LSC 214 ) and La 1−x Sr x CoO 3−δ (LSC 113 ) and a double-layer decoration of stacked LSC 214 and LSC 113 grown on the LSCF 113 markedly enhanced the surface exchange coefficients of the LSCF 113 by up to ∼1.5 orders of magnitude relative to the undecorated LSCF 113 . It is hypothesized that two different types of surface decorations can enable Sr segregation at the interface and surfaces of LSC 113 and LSC 214 , leading to enhancement of the oxygen surface exchange kinetics of decorated LSCF 113 .The development of highly active cathode materials is essential to lower the operating temperature of solid oxide fuel cells (SOFCs), where the slow kinetics of the oxygen surface exchange on the cathode surface limits the efficiency of SOFCs at intermediate temperatures (500-750°C). [1,2] Current cathode materials such as La 1−x Sr x MnO 3−δ (LSM 113 ) [3][4][5] with high electronic conductivity but low ionic conductivity [6] are inadequate for the usage in the intermediate temperature range due to insufficient surface activity.La 1−x Sr x Fe 1−y Co y O 3−δ (LSCF 113 ), which has beneficial materials properties such as high ionic and electronic conductivity, [7] and fast oxygen surface exchange, [8] therefore, has been developed as one of the most promising commercial cathode materials for intermediate temperature SOFCs. In particular, a solution infiltration process, in which a phase transition occurs from a liquid into a solid has been widely used to further enhance the surface activity of LSCF 113 . [9][10][11][12] Utilizing infiltrated LSM 113 coatings, it has been shown the enhanced electrocatalytic activity of LSCF 113 cathodes. [11,12] Infiltrated La 0.4875 Ca 0.0125 Ce 0.5 O 2−δ (LCC) [9] and Sm 0.5 Sr 0.5 CoO 3−δ (SSC) [10] coatings have also been used for better stability and activity of LSCF 113 electrodes. Although many studies have shown the enhanced cathodic performance of LSCF 113 by surface modification through a solution-based infiltration process, the origin responsible for the enhanced stability and activity of decorated LSCF 113 cathode is poorly understood.Ruddlesden-Popper (RP) phases (A 2 BO 4 ) have been utilized as a material for the La 1−x Sr x CoO 3−δ (LSC 113 ) surface modification, which results in the enhanced surface activity of LSC 113 significantly due to the formation of heterostructured oxide interfaces. [13][14][15][16][17][18] Using well-defined epitaxial thin film systems, remarkably enhanced oxygen surface exchange kinetics (up to ∼2 orders of magnitude) of LSC 113 has been reported by decorating (La 0.5 Sr 0.5 ) 2 CoO 4±δ (LSC 214 ) phase on the LSC 113 surface. [13,19] Coherent Bragg rod analysis (COBRA) and density functional theory (DFT) have suggested that the enhanced oxygen surface exchange kinetics may be attributed to the Sr segregation ...

show abstract

supporting

confidence: 67%

Enhancement of oxygen surface exchange on epitaxial La0.6Sr0.4Co0.2Fe0.8O3-δ thin films using advanced heterostructured oxide interface engineering

Lee

Wang

et al. 2016

MRS Communications

View full text Add to dashboard Cite

show abstract

“…The amount of charge carriers and thus the electrical conductivity and thermoelectric properties in this system can be tuned by suitable Cosite and La-site substitution [13][14][15][16][17][18][19][20][21][22]. There has been substantial recent interest in strontium-doped rare earth perovskites (Ln 1-x Sr x CoO 3-δ ) as cathode materials for solid oxide fuels cells [19,[23][24][25][26][27][28], as an ideal substrate for the deposition of lead zirconium titanate (PZT) films [29], and as high temperature ceramic membranes [30][31][32]. These phases also display novel magnetic behaviour, including glassiness and room temperature ferromagnetism [33][34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Sol-gel preparation and characterization of non-substituted and Sr-substituted lanthanum cobaltates

Cizauskaite

Kareiva

2008

Open Chemistry

View full text Add to dashboard Cite

This paper reports on the results concerning the sol-gel preparation and characterization of Sr-substituted perovskite lanthanum cobaltates La 1-x Sr x CoO 3-d (x = 0.0, 0.25, 0.5 and 0.75). The metal ions, generated by dissolving starting materials in diluted acetic acid were complexed by 1,2-ethanediol to obtain the precursors for the non-substituted and Sr-substituted LaCoO 3 . The influence of the synthesis temperature, heating time and the amount of substituent on the phase purity of La 1-x Sr x CoO 3-d were investigated. The phase transformations, composition and micro-structural features in the gels and polycrystalline samples were studied by thermal analysis (TG/DTA), infrared spectroscopy (IR), powder X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). © Versita Warsaw and Springer-Verlag Berlin Heidelberg.

show abstract

“…The structure and oxygen transport of the Sr 1−x Ln x CoO 3−␦ ͑Ln = rare-earth cations͒ complex cobalt oxides has been previously studied. [1][2][3][4][5][6][7][8] Cobalt oxides such as Sr 1−x Y x CoO 3−␦ are also potentially important as they can be used in dense membranes to separate oxygen from gas mixtures and because they exhibit a metal-insulator transition, a spin-state transition, and ferromagnetism. [9][10][11][12][13][14][15] A detailed knowledge of crystal structure and stoichiometry is essential in order to understand the mechanism of ionic diffusion.…”

mentioning

confidence: 99%

Oxygen diffusion inSr0.75Y0.25CoO2.625: A molecular dynamics study

et al. 2009

View full text Add to dashboard Cite

Oxygen diffusion in Sr 0.75 Y 0.25 CoO 2.625 is investigated using molecular dynamics simulations in conjunction with an established set of Born model potentials. We predict an activation energy of diffusion for 1.56 eV in the temperature range of 1000-1400 K. We observe extensive disordering of the oxygen ions over a subset of lattice sites. Furthermore, oxygen ion diffusion both in the a-b plane and along the c axis requires the same set of rate-limiting ion hops. It is predicted that oxygen transport in Sr 0.75 Y 0.25 CoO 2.625 is therefore isotropic.

show abstract

Structural aspects of the ionic conductivity of La1âxSrxCoO3âÎ´

Cited by 151 publications

References 39 publications

Enhancement of oxygen surface exchange on epitaxial La0.6Sr0.4Co0.2Fe0.8O3-δ thin films using advanced heterostructured oxide interface engineering

Enhancement of oxygen surface exchange on epitaxial La0.6Sr0.4Co0.2Fe0.8O3-δ thin films using advanced heterostructured oxide interface engineering

Sol-gel preparation and characterization of non-substituted and Sr-substituted lanthanum cobaltates

Oxygen diffusion inSr0.75Y0.25CoO2.625: A molecular dynamics study

Contact Info

Product

Resources

About

Structural aspects of the ionic conductivity of La1âxSrxCoO3âÎ´

Cited by 151 publications

References 39 publications

Enhancement of oxygen surface exchange on epitaxial La0.6Sr0.4Co0.2Fe0.8O3-δ thin films using advanced heterostructured oxide interface engineering

Enhancement of oxygen surface exchange on epitaxial La0.6Sr0.4Co0.2Fe0.8O3-δ thin films using advanced heterostructured oxide interface engineering

Sol-gel preparation and characterization of non-substituted and Sr-substituted lanthanum cobaltates

Oxygen diffusion inSr0.75Y0.25CoO2.625: A molecular dynamics study

Contact Info

Product

Resources

About

Structural aspects of the ionic conductivity of La1âxSrxCoO3âÎ´