Introduction of A-site deficiency into La0.6Sr0.4Co0.2Fe0.8O3–δ and its effect on structure and conductivity

Mineshige, Atsushi; Izutsu, Junko; Nakamura, Maiko; Nigaki, Kengo; Abe, Jiro; Kobune, Masafumi; Fujii, Satoshi; Yazawa, Tetsuo

doi:10.1016/j.ssi.2004.11.021

Cited by 155 publications

(101 citation statements)

References 11 publications

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“…To solve this problem, the application of materials having low polarisation resistance values at intermediate temperatures is crucial. Among the other cathode materials, lanthanum strontium cobaltite ferrite (LSCF) was found to be a promising material and many of its successful applications were widely reported elsewhere [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The Rheology of Stabilised Lanthanum Strontium Cobaltite Ferrite Nanopowders in Organic Medium Applicable as Screen Printed SOFC Cathode Layers

Burnat¹,

Ried²,

Holtappels³

et al. 2010

Fuel Cells

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The production and optimisation of screen printing (SP) pastes containing La0.58Sr0.42Co0.21Fe0.79O3 – δ and La0.61Sr0.41Co0.19Fe0.79O3 – δ (LSCF) were investigated. The application of these nanopowders is supposed to improve the cathode's microstructure and increase its mechanical strength. Thirty seven pastes containing LSCF were carried out with variation in binders, dispersants and different particle size distribution. The rheological behaviour of these pastes was investigated. It was found that commercially available dispersant Solsperse 3000 resulted in the best suspension stability, achieving almost 55 times lower viscosity value for pastes containing 20 vol.‐%, than pastes without any dispersants. The shear thinning behaviour was found to be favourable for the LSCF cathode deposition. A cathode made from the mixture of nano and submicron powder exhibits a polarisation resistance as low as 0.76 Ω cm2 at 592 °C.

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Section: Introductionmentioning

confidence: 99%

The Rheology of Stabilised Lanthanum Strontium Cobaltite Ferrite Nanopowders in Organic Medium Applicable as Screen Printed SOFC Cathode Layers

Burnat¹,

Ried²,

Holtappels³

et al. 2010

Fuel Cells

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“…In the LSF crystal structure, cation substitutions are expected to be widely accommodated on the lanthanum site (A-site) [10] as well as on the iron site (B-site), leading to modifications in the crystallographic structure as well as the catalytic-and electronic properties. Previous investigations [11] showed that the total conductivity of LSF depends on the composition and stoichiometry.…”

mentioning

confidence: 99%

Influence of A‐Site Variation and B‐Site Substitution on the Physical Properties of (La,Sr)FeO₃Based Perovskites

et al. 2009

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Perovskite‐type materials have been synthesised and investigated with regards to their physical properties including specific surface area (BET), phase purity, sinter behaviour, coefficient of thermal expansion (CTE) and electrical conductivity. We investigated the effect of Sr variation on La1–xSrxFeO3–δ the influence of A‐site stoichiometry on (La0.8Sr0.2)yFeO3–δ and the impact of substitution of iron by nickel or copper up to 20 mol%. The over‐stoichiometric compositions indicate secondary phases independent of the calcination temperature. Stoichiometric and understoichiometric compositions become single phase perovskites after calcination at 1,200 °C. The substitution of Fe by Ni or Cu on the B‐site, (La0.2Sr0.8)0.95Ni/CuxFe1–xO3, is viable, but limited to 20 mol%. Cu substitution and under‐stoichiometry lower the melting point and thus consequently influence the sintering temperature.The diverse LSF composition as well as Ni/Cu substitutions affects the CTE. The CTE matches quite well with YSZ, by a 15% A‐site deficiency, as well as with Ni substitution on the B‐site. Compatibility tests at 1,000 °C prove that Ni increases the reactivity of LSF with YSZ. In case of the CGO, no indication of reactions or interdiffusion could be observed. The substitution of iron by 20 mol% nickel or copper significantly enhances the electrical conductivity of the basic composition (La0.8Sr0.2)0.95FeO3–δ.

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“…In addition to the Sr movement, Hardy et al observed large Co-rich deposits in the Ce 1-x Sm x O 2-δ (SDC) layer for the LSCF|SDC half-cell. The rate of Sr and/or Co loss from the LSCF cathode lattice has been discussed also by Tai et al, 31 Mineshige et al 32 and Hashimoto et al 33 The rate of segregation calculated varies for Sr and Co 31,32 and depends on the examined system. Wang et al reported that Co and Fe, which diffused from the LSCF cathode into the grain boundaries of the GDC barrier layer prepared by pulsed laser deposition method, have a strong influence on the diffusion of Sr and Zr.…”

Section: Commercial Application Of Solid Oxide Fuel Cells (Sofc)mentioning

confidence: 92%

“…Wang et al reported that Co and Fe, which diffused from the LSCF cathode into the grain boundaries of the GDC barrier layer prepared by pulsed laser deposition method, have a strong influence on the diffusion of Sr and Zr. 34 Thus, the diffusion of Sr through the GDC barrier layer has been intensively studied [22][23][24][25][26][27][28][29][30][31][32][33][34] and it can be concluded that the reaction kinetics and mass transfer parameters depend significantly on the method used for the preparation of GDC film, pretreatment of materials as well as on sintering conditions, including the duration and temperature of sintering, thickness of the GDC barrier layer etc.…”

Section: Commercial Application Of Solid Oxide Fuel Cells (Sofc)mentioning

confidence: 99%

Mobility of Sr in Gadolinia Doped Ceria Barrier Layers Prepared Using Spray Pyrolysis, Pulsed Laser Deposition and Magnetron Sputtering Methods

Nurk

Vestli

Möller

et al. 2015

J. Electrochem. Soc.

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Gadolinia doped ceria Ce 0.9 Gd 0.1 O 2-δ (GDC) barrier layer was deposited onto YSZ electrolyte and Ni-YSZ|YSZ electrolyte half-cell using pulsed laser deposition (PLD), magnetron sputtering (MS) or spray pyrolysis (SP) methods. The first set of GDC barrier layers was studied without additional sintering and the second set was additionally sintered for 3 h at 1300 • C. Sr mobility initiated by thermal treatment of La 0.6 Sr 0.4 CoO 3-δ cathode at 950 • C and 1100 • C was systematically studied with the GDC layers prepared using PLD, MS and SP methods. Concentration profiles of Zr ion in GDC, Ce in YSZ, Sr in GDC and Sr in YSZ were recorded using TOF-SIMS analysis method. XRD and SEM methods were applied for the analysis of Sr mobility in the GDC layer and results were correlated with impedance, cyclic voltammetry and other electrochemical data. The influence of synthesis method and thermal treatment of the GDC layer on the Sr mobility was established. Changes in the microstructure of cathode|chemical barrier layer|electrolyte interfaces caused by the thermal treatment of the cathode as well as the GDC layer during the preparation (including sintering) steps have been demonstrated and discussed.

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Introduction of A-site deficiency into La0.6Sr0.4Co0.2Fe0.8O3–δ and its effect on structure and conductivity

Cited by 155 publications

References 11 publications

The Rheology of Stabilised Lanthanum Strontium Cobaltite Ferrite Nanopowders in Organic Medium Applicable as Screen Printed SOFC Cathode Layers

The Rheology of Stabilised Lanthanum Strontium Cobaltite Ferrite Nanopowders in Organic Medium Applicable as Screen Printed SOFC Cathode Layers

Influence of A‐Site Variation and B‐Site Substitution on the Physical Properties of (La,Sr)FeO₃Based Perovskites

Mobility of Sr in Gadolinia Doped Ceria Barrier Layers Prepared Using Spray Pyrolysis, Pulsed Laser Deposition and Magnetron Sputtering Methods

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Introduction of A-site deficiency into La0.6Sr0.4Co0.2Fe0.8O3–δ and its effect on structure and conductivity

Cited by 155 publications

References 11 publications

The Rheology of Stabilised Lanthanum Strontium Cobaltite Ferrite Nanopowders in Organic Medium Applicable as Screen Printed SOFC Cathode Layers

The Rheology of Stabilised Lanthanum Strontium Cobaltite Ferrite Nanopowders in Organic Medium Applicable as Screen Printed SOFC Cathode Layers

Influence of A‐Site Variation and B‐Site Substitution on the Physical Properties of (La,Sr)FeO3Based Perovskites

Mobility of Sr in Gadolinia Doped Ceria Barrier Layers Prepared Using Spray Pyrolysis, Pulsed Laser Deposition and Magnetron Sputtering Methods

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Influence of A‐Site Variation and B‐Site Substitution on the Physical Properties of (La,Sr)FeO₃Based Perovskites