Oxygen non-stoichiometry and mixed conductivity of La0.5Sr0.5Fe1–x Mn x O3–δ

Markov, A.A.; Chesnokov, K. Yu.; Патракеев, М.В.; Леонидов, И. А.; Чукин, А. В.; Леонидова, О. Н.; Кожевников, В. Л.

doi:10.1007/s10008-015-3027-0

Cited by 18 publications

(3 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thermal expansion behavior of LSFN is studied as shown in Figure b. The average TEC of LSFN between room temperature and 1000 °C is 11.9 × 10 –6 K –1 , similar to the results reported for cobalt-free perovskites in ref , and apparently it is lower than those for cobalt-based perovskite as La 0.4 Sr 0.6 Co 0.2 Fe 0.8 O 3−δ (19.95 × 10 –6 K –1 at 100–800 °C), PrBa 0.5 Sr 0.5 Co 2 O 5+δ (20.46 × 10 –6 K –1 at 30–850 °C), and SrCo 0.9 Nb 0.1 O 3−δ (24.2 × 10 –6 K –1 at 30–1000 °C) . And the TEC value of LSFN matches perfectly with the GDC electrolyte (12 × 10 –6 K –1 ) .…”

Section: Resultssupporting

confidence: 79%

Cobalt-Free Perovskite Oxide La_0.6Sr_0.4Fe_0.8Ni_0.2O_3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Tian

Wang

Liu

et al. 2019

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Reversible solid oxide cells have received increasing attention due to high efficiency. Cobalt-free perovskite electrode has compatible thermal expansion coefficient matching with the electrolyte and the reversible operation to inhibit the segregation of Sr. Herein a novel cobalt-free La 0.6 Sr 0.4 Fe 0.8 Ni 0.2 O 3−δ perovskite is developed and investigated as oxygen electrode for reversible solid oxide cells. The electrochemical performance of La 0.6 Sr 0.4 Fe 0.8 Ni 0.2 O 3−δ oxygen electrode in fuel cell mode and electrolysis mode is investigated in detail. The maximum power density of 961 mW cm −2 and polarization resistance of 0.142 Ω cm 2 at 800 °C can be achieved in fuel cell mode. While the cell is operated in electrolysis mode, the current density ranges from 0.53 A cm −2 at 750 °C to 1.09 A cm −2 at 850 °C with 50 vol % absolute humidity at 1.3 V, and the hydrogen generation rate can reach up to 1348.5 mL (cm 2 h) −1 with 90 vol % absolute humidity at 800 °C. The reversible solid oxide cells show excellent reversibility and stability during 144 h medium-term reversible operation. The results indicate that La 0.6 Sr 0.4 Fe 0.8 Ni 0.2 O 3−δ has a bright prospect as the oxygen electrode material for reversible solid oxide cells.

show abstract

Section: Resultssupporting

confidence: 79%

Cobalt-Free Perovskite Oxide La_0.6Sr_0.4Fe_0.8Ni_0.2O_3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Tian

Wang

Liu

et al. 2019

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…The linear sweep voltammograms (LSVs) of a 100% carbon electrode, 100% LSFM-HS, and their mixture are reported in Figure S11. As illustrated in the figure, the carbon is necessary to improve the utilization of the LSFM catalysts for ORR due to the low electrical conductivity of the oxides, , but its contribution to the ORR current in the potential interval [−0.3 to −0.1 V versus Hg/HgO] is negligible. Figure a compares the LSVs recorded at 1600 rpm for the four catalysts.…”

Section: Results and Discussionmentioning

confidence: 99%

Perovskite-Type Catalysts Prepared by Nanocasting: Effect of Metal Silicates on the Electrocatalytic Activity toward Oxygen Evolution and Reduction Reactions

Deganello

Oko

Testa

et al. 2018

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

La 0.6 Sr 0.4 Fe 0.6 Mn 0.4 O 3−δ (LSFM) perovskite-type catalysts were prepared by a nanocasting route based on solution combustion synthesis, called the soft−hard templating (SHT) approach. Three silica hard templates with different textural properties were used to increase the specific surface area of the perovskites, and hence to improve their electrochemical activity for both oxygen evolution and reduction reactions. Careful structural and physicochemical characterization revealed that the materials are composites formed by crystalline LSFM perovskite and amorphous metal silicates, even after the etching procedure. Both the composites' specific surface area and the fraction of silicates are proportional to the silicas pore volume. Interestingly, the LSFM perovskite obtained by SHT has lower cell volumes than the parent oxide prepared without a silica template. The electrochemical characterization revealed the contrasting effects of the metal silicates on the performances of the electrodes. The LSFM-SHT-based electrodes have higher double-layer capacitance and higher current for oxygen evolution than those prepared with the parent LSFM. Furthermore, the LSFM-SHT-based electrodes show a preferential 4-electron pathway during the oxygen reduction reaction, if the amount of amorphous silicates is low (Si wt % < 3.5 wt %). However, the silicates also shift the onset potential of both oxygen evolution and reduction reactions to more positive and negative potential values, respectively, thus delaying the two reactions.

show abstract

“…For instance, the perovskite‐like solid solution La 1− x Sr x FeO 3− δ is the main constituent of inexpensive and efficient ceramic membranes for oxygen separation and primary processing of natural gas . Numerous experimental studies give evidence to a considerable influence of cation and oxygen defects on the structure and properties of La 1− x Sr x FeO 3− δ . At low and moderate temperatures, where the concentration of oxygen vacancies is very small, orthorhombic and tetragonal distortions are characteristic for La 1− x Sr x FeO 3− δ at 0 ≤ x ≤ 0.2 and 0.4 ≤ x ≤ 0.7, respectively, and only further substitution of strontium for lanthanum results in stabilization of a cubic structure .…”

Section: Introductionmentioning

confidence: 99%

Evolution of Electronic Spectrum and Magnetic Properties of the High‐Temperature Cubic Phase La_1−xSr_xFeO_3−δ in Coherent Potential Approximation

Zaĭnullina

Korotin

Кожевников

2018

Physica Status Solidi (b)

View full text Add to dashboard Cite

The electron structure features in the high-temperature cubic perovskite-like ferrite La 1Àx Sr x FeO 3Àδ are studied depending on concentration of disordered cation and anion defects by use of the Coherent Potential Approximatiom (CPA) taking into account the strong electronic correlations (U) in Fe d-shell. The variations of electronic-energy and magnetic characteristics are described at 0 δ 0.25 and 0 x 0.50. The spin state of iron atoms in stoichiometric δ ¼ 0 compositions is shown to change near x ¼ 0.4, which gives an explanation to the observed experimental data.

show abstract

Oxygen non-stoichiometry and mixed conductivity of La0.5Sr0.5Fe1–x Mn x O3–δ

Cited by 18 publications

References 40 publications

Cobalt-Free Perovskite Oxide La_0.6Sr_0.4Fe_0.8Ni_0.2O_3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Cobalt-Free Perovskite Oxide La_0.6Sr_0.4Fe_0.8Ni_0.2O_3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Perovskite-Type Catalysts Prepared by Nanocasting: Effect of Metal Silicates on the Electrocatalytic Activity toward Oxygen Evolution and Reduction Reactions

Evolution of Electronic Spectrum and Magnetic Properties of the High‐Temperature Cubic Phase La_1−xSr_xFeO_3−δ in Coherent Potential Approximation

Contact Info

Product

Resources

About

Oxygen non-stoichiometry and mixed conductivity of La0.5Sr0.5Fe1–x Mn x O3–δ

Cited by 18 publications

References 40 publications

Cobalt-Free Perovskite Oxide La0.6Sr0.4Fe0.8Ni0.2O3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Cobalt-Free Perovskite Oxide La0.6Sr0.4Fe0.8Ni0.2O3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Perovskite-Type Catalysts Prepared by Nanocasting: Effect of Metal Silicates on the Electrocatalytic Activity toward Oxygen Evolution and Reduction Reactions

Evolution of Electronic Spectrum and Magnetic Properties of the High‐Temperature Cubic Phase La1−xSrxFeO3−δ in Coherent Potential Approximation

Contact Info

Product

Resources

About

Cobalt-Free Perovskite Oxide La_0.6Sr_0.4Fe_0.8Ni_0.2O_3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Cobalt-Free Perovskite Oxide La_0.6Sr_0.4Fe_0.8Ni_0.2O_3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Evolution of Electronic Spectrum and Magnetic Properties of the High‐Temperature Cubic Phase La_1−xSr_xFeO_3−δ in Coherent Potential Approximation