Oxidation–reduction behavior of La0.8Sr0.2Sc Mn1−O3± (y= 0.2, 0.3, 0.4): Defect structure, thermodynamic and electrical properties

Sengodan, Sivaprakash; Ahn, Sung-Hoo; Shin, Jeeyoung; Kim, Guntae

doi:10.1016/j.ssi.2012.09.004

Cited by 16 publications

(10 citation statements)

References 24 publications

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“…[12,13] Thec ation vacancies would cause the disintegration of LSM and the formation of cation oxides or LSM nanoparticles.I tr esults in degradation and delamination due to severe microstructural damage near the air electrode/electrolyte interface. [14,15] Recently,one group found that reversible cycling between electrolysis and fuel-cell modes can eliminate severe electrolysis-induced degradation. Reversible cycling with time periods of 1hour in electrolysis mode and 5hours in fuel-cell mode reduce the internal oxygen pressure at the air electrode/ electrolyte interface during electrolysis operation, which would reduce delamination and microstructural damage.…”

Section: Inrecentyearstherehavebeenincreasingdemandsforcleanmentioning

confidence: 99%

“…From an eutron diffraction study,T ofield and Scott reported the existence of cation vacancies at both La and Mn sites. [15,30] Thus,i tis assumed that metal vacancies on both La and Mn are the predominant defects in the higher p(O 2 )region. In the oxygen excess region, the formation of cation vacancies in LSM may be expressed as:…”

Section: Inrecentyearstherehavebeenincreasingdemandsforcleanmentioning

confidence: 99%

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Achieving High Efficiency and Eliminating Degradation in Solid Oxide Electrochemical Cells Using High Oxygen‐Capacity Perovskite

et al. 2016

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Recently, there have been efforts to use clean and renewable energy because of finite fossil fuels and environmental problems. Owing to the site-specific and weather-dependent characteristics of the renewable energy supply, solid oxide electrolysis cells (SOECs) have received considerable attention to store energy as hydrogen. Conventional SOECs use Ni-YSZ (yttria-stabilized zirconia) and LSM (strontium-doped lanthanum manganites)-YSZ as electrodes. These electrodes, however, suffer from redox-instability and coarsening of the Ni electrode along with delamination of the LSM electrode during steam electrolysis. In this study, we successfully design and fabricate highly efficient SOECs using layered perovskites, PrBaMn2 O5+δ (PBM) and PrBa0.5 Sr0.5 Co1.5 Fe0.5 O5+δ (PBSCF50), as both electrodes for the first time. The SOEC with layered perovskites as both-side electrodes shows outstanding performance, reversible cycling, and remarkable stability over 600 hours.

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Section: Inrecentyearstherehavebeenincreasingdemandsforcleanmentioning

confidence: 99%

Section: Inrecentyearstherehavebeenincreasingdemandsforcleanmentioning

confidence: 99%

Achieving High Efficiency and Eliminating Degradation in Solid Oxide Electrochemical Cells Using High Oxygen‐Capacity Perovskite

et al. 2016

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“…All the samples show sufficient electrical conductivity values of 589, 503, and 344 S cm −1 for PBCO, PBCSc, and SP-PBCSc, respectively at 500 • C, which are higher than the requirement for efficient SOFC operation (>10 S cm −1 ). PBCSc shows smaller electrical conductivity than PBCO due to disturbance of the electron conduction, which originated from the substitution of constant valance state Sc 3+ ion for multivalent Co ion [24,40,41]. Substitution of the Sc 3+ reduces the overlapping between multivalent Co ion with the oxygen 2p orbitals and decreases the electron transport between the multivalent cobalt cations, which is known as Zener double exchange.…”

Section: Resultsmentioning

confidence: 99%

Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

et al. 2018

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Layered perovskite oxides are considered as promising cathode materials for the solid oxide fuel cell (SOFC) due to their high electronic/ionic conductivity and fast oxygen kinetics at low temperature. Many researchers have focused on further improving the electrochemical performance of the layered perovskite material by doping various metal ions into the B-site. Herein, we report that Sc3+ doping into the layered perovskite material, PrBaCo2O5+δ (PBCO), shows a positive effect of increasing electrochemical performances. We confirmed that Sc3+ doping could provide a favorable crystalline structure of layered perovskite for oxygen ion transfer in the lattice with improved Goldschmidt tolerance factor and specific free volume. Consequently, the Sc3+ doped PBCO exhibits a maximum power density of 0.73 W cm−2 at 500 °C, 1.3 times higher than that of PBCO. These results indicate that Sc3+ doping could effectively improve the electrochemical properties of the layered perovskite material, PBCO.

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“…The cation vacancies would cause the disintegration of LSM and the formation of cation oxides or LSM nanoparticles. It results in degradation and delamination due to severe microstructural damage near the air electrode/electrolyte interface …”

Section: Figurementioning

confidence: 99%

“…Excess oxygen in LSM can form cation vacancies because oxygen ions do not participate in the interstitial position of the close‐packed ABO 3 type perovskite structure owing to their larger ionic radii. From a neutron diffraction study, Tofield and Scott reported the existence of cation vacancies at both La and Mn sites . Thus, it is assumed that metal vacancies on both La and Mn are the predominant defects in the higher p (O 2 ) region.…”

Section: Figurementioning

confidence: 99%

Achieving High Efficiency and Eliminating Degradation in Solid Oxide Electrochemical Cells Using High Oxygen‐Capacity Perovskite

et al. 2016

Self Cite

View full text Add to dashboard Cite

Recently,t here have been efforts to use clean and renewable energy because of finite fossil fuels and environmental problems.O wing to the site-specific and weatherdependent characteristics of the renewable energy supply,solid oxide electrolysis cells (SOECs) have received considerable attention to store energy as hydrogen. Conventional SOECs use Ni-YSZ (yttria-stabilized zirconia) and LSM (strontiumdoped lanthanum manganites)-YSZ as electrodes.T hese electrodes,however,suffer from redox-instability and coarsening of the Ni electrode along with delamination of the LSM electrode during steam electrolysis.I nt his study,w es uccessfully design and fabricate highly efficient SOECs using layered perovskites,P rBaMn 2 O 5+d (PBM) and PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+d (PBSCF50), as both electrodes for the first time.The SOEC with layered perovskites as both-side electrodes shows outstanding performance,r eversible cycling, and remarkable stability over 600 hours.Supportinginformation for this article can be found under: http://dx.

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Oxidation–reduction behavior of La0.8Sr0.2Sc Mn1−O3± (y= 0.2, 0.3, 0.4): Defect structure, thermodynamic and electrical properties

Cited by 16 publications

References 24 publications

Achieving High Efficiency and Eliminating Degradation in Solid Oxide Electrochemical Cells Using High Oxygen‐Capacity Perovskite

Achieving High Efficiency and Eliminating Degradation in Solid Oxide Electrochemical Cells Using High Oxygen‐Capacity Perovskite

Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

Achieving High Efficiency and Eliminating Degradation in Solid Oxide Electrochemical Cells Using High Oxygen‐Capacity Perovskite

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