The phase diagram and crystal chemistry of strontium-doped rare earth cobaltates: Ln2−xSrxCoO4+δ (Ln=La–Dy)

James, M. R.; Tedesco, A.; Cassidy, David J.; Colella, Michael; Smythe, Peter

doi:10.1016/j.jallcom.2005.08.080

Cited by 31 publications

(14 citation statements)

References 30 publications

(46 reference statements)

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“…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.…”

Section: Introductionsupporting

confidence: 66%

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

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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 ...

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Section: Introductionsupporting

confidence: 66%

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

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“…These peaks give rise to c tetragonal = 12.5 Å for LSC 214 , which is comparable to previously reported values. 19,20 Off-normal phi-scan analysis shows that LSC60-40 113 {101} pc , GDC{202} cubic and YSZ{202} cubic have strong peaks with 4-fold cubic symmetry ( Figure S1a), 21 which reveals the in-plane crystallographic relationships between GDC and YSZ (a cube-on-cube alignment), and LSC60-40 113 and GDC (a in-plane 45 • rotation), having [100] pc LSC60-40 113 //[110] cubic GDC//[110] cubic YSZ ( Figure S1b). 21 These results are in agreement with our previously published findings for LSC80-20 113 thin films.…”

Section: Resultsmentioning

confidence: 99%

Oxygen Electrocatalysis on Epitaxial La_0.6Sr_0.4CoO_3-_δPerovskite Thin Films for Solid Oxide Fuel Cells

Crumlin

Ahn

Lee

et al. 2012

J. Electrochem. Soc.

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Hetero-structured interfaces of oxides, which can exhibit reactivity characteristics remarkably different from bulk oxides, are interesting systems to explore in search of highly active fuel cell catalysts for oxygen electrocatalysis. (001)-oriented La 0.6 Sr 0.4 CoO 3-δ (LSC60-40 113 ) thin films having thicknesses from tens to hundreds of nanometers were grown epitaxially on (001)-oriented yttriastabilized zirconia (YSZ). Atomic force microscopy showed that all the film surfaces were of high quality with average surface roughness approximately one nanometer. The surface oxygen exchange kinetics of these films were determined by electrochemical impedance spectroscopy. While (001)-oriented LSC60-40 113 thin films were found to have similar surface oxygen exchange coefficients to LSC60-40 113 bulk, surface coverage of ( 001)-oriented (La 0.5 Sr 0.5 ) 2 CoO 4±δ (LSC 214 ) on the LSC60-40 113 thin films led to significant enhancement in the surface oxygen kinetics up to ∼3 orders of magnitude. Interestingly, LSC 214 -decorated LSC60-40 113 films have comparable surface exchange kinetics (∼1 • 10 −5 cm • s −1 at 550 • C) to similarly prepared LSC 214 -decorated La 0.8 Sr 0.2 CoO 3-δ films. Such high surface oxygen kinetics are among the most active SOFC cathode materials reported to date.

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“…Usually, solid state synthesis is used for NdCaCoO 4 production [5,6]; however, even the application of wet chemical synthesis methods does not allow reducing the synthesis temperature below 1100 8C [7,8]. LaSrCoO 4 can be obtained by freeze drying synthesis methods at 800 8C [9] while the formation of single phase NdCaCoO 4 at this temperature has not been observed yet [10].…”

Section: Introductionmentioning

confidence: 99%

Cryogel synthesis and solid state reactivity of NdCaCoO4

Shlyakhtin

Мазо

Malyshev

et al. 2013

Materials Research Bulletin

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The phase diagram and crystal chemistry of strontium-doped rare earth cobaltates: Ln2−xSrxCoO4+δ (Ln=La–Dy)

Cited by 31 publications

References 30 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

Oxygen Electrocatalysis on Epitaxial La_0.6Sr_0.4CoO_3-_δPerovskite Thin Films for Solid Oxide Fuel Cells

Cryogel synthesis and solid state reactivity of NdCaCoO4

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The phase diagram and crystal chemistry of strontium-doped rare earth cobaltates: Ln2−xSrxCoO4+δ (Ln=La–Dy)

Cited by 31 publications

References 30 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

Oxygen Electrocatalysis on Epitaxial La0.6Sr0.4CoO3-δPerovskite Thin Films for Solid Oxide Fuel Cells

Cryogel synthesis and solid state reactivity of NdCaCoO4

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Oxygen Electrocatalysis on Epitaxial La_0.6Sr_0.4CoO_3-_δPerovskite Thin Films for Solid Oxide Fuel Cells