Effect of B-site substitution on the crystal structure, electrical conductivity and oxygen transport properties of La0.5Sr0.5M0.2Fe0.8O3-δ (M = Co, Al, and Zn) perovskite

Sowjanya, Ch.; Mandal, Rupesh; Abhinay, S.; Mohanta, Amiya; Das, Subhadip; Pratihar, Swadesh K.

doi:10.1016/j.jssc.2020.121237

Cited by 9 publications

(4 citation statements)

References 75 publications

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“…However, loss of Co from the lattice due to high temperature could trigger Co reduction [19]. To tackle physical and chemical stability issues, these perovskites have been incorporated with other metals either at A-site [20,21], B-site [22][23][24], and O-site (Table 1).…”

Section: Dopingmentioning

confidence: 99%

“…The effect of introduced stresses in the grains on the lattice dimensions of perovskites by doping has shown its effect on the electrical conductivity due to altering porosity of the cathode material [32]. However it has been observed that , with the similar grain size of perovskites with entirely different dopants the perovskite cathode material with more charge carrier concentration always showed higher conductivity, i.e., having more mixed valence cation concentration [24].…”

Section: Effect On Conductivitymentioning

confidence: 99%

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Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cells

Nisar,

Kaur,

Giddey

et al. 2024

Preprint

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Intermediate temperature solid oxide fuel cell (SOFC) operation provides numerous advantages such as high combined heat and power (CHP) efficiency, potentially long-term materials stability, and the use of low-cost materials. However, due to the sluggish kinetics of the oxygen reduction reaction at intermediate temperature, the cathode of SOFC requires an efficient and stable catalyst. Significant progress in the development of cathode materials has been made over recent years. In this article, multiple strategies for improving the performance of cathode materials have been extensively reviewed such as A and B site doping of perovskites, infiltration of catalytic active materials, the use of core-shell composites, etc. Emphasis has been given to intrinsic properties such as thermal expansion compatibility, chemical and thermal stability, and oxygen transport number. Furthermore, to avoid any insulating phase formation at the cathode/electrolyte interface, strategies for interfacial layer modifications have also been extensively reviewed and summarized. Based on major technical challenges, future research directions have been proposed for efficient and stable intermediate temperature solid oxide fuel cell (SOFC) operation.

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Section: Dopingmentioning

confidence: 99%

Section: Effect On Conductivitymentioning

confidence: 99%

Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cells

Nisar,

Kaur,

Giddey

et al. 2024

Preprint

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“…(1) the high oxygen vacancy concentration of the cathode enhances the bulk and surface exchange properties for ORRs; 33,34 (2) the good connectivity between the electrode particles facilitates the conduction of ions and electrons; and (3) the large surface area facilitates the diffusion and adsorption of oxygen.…”

Section: Electrochemical Performance Analysismentioning

confidence: 99%

A new strategy for improving the electrochemical performance of perovskite cathodes: pre-calcining the perovskite oxide precursor in a nitrogen atmosphere

Chen

Zhao

et al. 2021

Nanoscale Adv.

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“…The Fe 2p presented well separated spin-orbit components and a satellite. The two samples present the classical figure of iron from LSCF, where each spin-orbit component can be fitted by two contributions, the one at low binding energy corresponding to iron +III oxidation state while the one at higher binding energy belongs to iron +IV oxidation state [50,73,74].…”

Section: Structural and Surface Chemistry Analysismentioning

confidence: 99%

Chemical Degradation of the La0.6Sr0.4Co0.2Fe0.8O3−δ/Ce0.8Sm0.2O2−δ Interface during Sintering and Cell Operation

et al. 2021

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A complete cell consisting of NiO-Ce0.8Sm0.2O3−δ//Ce0.8Sm0.2O3−δ//(La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ elaborated by a co-tape casting and co-sintering process and tested in operating fuel cell conditions exhibited a strong degradation in performance over time. Study of the cathode–electrolyte interface after cell testing showed, on one hand, the diffusion of lanthanum from (La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ into Sm-doped ceria leading to a La- and Sm-doped ceria phase. On the other hand, Ce and Sm diffused into the perovskite phase of the cathode. The grain boundaries appear to be the preferred pathways of the cation diffusion. Furthermore, a strontium enrichment was clearly observed both in the (La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ layer and at the interface with electrolyte. X-ray photoelectron spectroscopy (XPS) indicates that this Sr-rich phase corresponded to SrCO3. These different phenomena led to a chemical degradation of materials and interfaces, explaining the decrease in electrochemical performance.

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Effect of B-site substitution on the crystal structure, electrical conductivity and oxygen transport properties of La0.5Sr0.5M0.2Fe0.8O3-δ (M = Co, Al, and Zn) perovskite

Cited by 9 publications

References 75 publications

Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cells

Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cells

A new strategy for improving the electrochemical performance of perovskite cathodes: pre-calcining the perovskite oxide precursor in a nitrogen atmosphere

Chemical Degradation of the La0.6Sr0.4Co0.2Fe0.8O3−δ/Ce0.8Sm0.2O2−δ Interface during Sintering and Cell Operation

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