Correlation between electrical and mechanical properties in La1−xSrxGa1−yMgyO3−δ ceramics used as electrolytes for solid oxide fuel cells

Morales, M.; Roa, J.J.; Pérez-Falcón, José Manuel; Moure, A.; Tartaj, J.; Espiell, F.; Segarra, M.

doi:10.1016/j.jpowsour.2013.08.028

Cited by 22 publications

(10 citation statements)

References 38 publications

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“…Generally, the densification of LSGM to a gas impermeable level requires a very high sintering temperature (around 1400°C-1500°C). 21,[27][28][29] The advantage of the LSGM electrolyte is its compatibility with the Mn-and Co-based perovskite-type cathode materials. [30][31][32][33][34][35][36] It has been reported that a small amount of Co doping in the LSGM structure is not detrimental to its oxide ion-conduction properties and thus enables a lower temperature operation.…”

Section: Ishii Et Almentioning

confidence: 99%

“…However, one of the problems is the high chemical reactivity of LSGM at the temperatures required for cell manufacturing, which makes the preparation of the LSGM‐based IT‐SOFCs difficult. Generally, the densification of LSGM to a gas impermeable level requires a very high sintering temperature (around 1400°C‐1500°C) . The advantage of the LSGM electrolyte is its compatibility with the Mn‐ and Co‐based perovskite‐type cathode materials .…”

Section: Introductionmentioning

confidence: 99%

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Effect of A‐site ion nonstoichiometry on the chemical stability and electric conductivity of strontium and magnesium‐doped lanthanum gallate

et al. 2019

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A series of Sr‐ion deficient perovskites La0.8Sr0.2−xGa0.8Mg0.2O2.8−δ (LSGM8282, x = 0.00, 0.05, 0.10, 0.15, 0.20), was synthesized by a conventional solid‐state reaction method and their electric conductivity and chemical reactivity with Gd‐doped ceria were investigated. Reactivity tests between the LSGMs and Ce0.9Gd0.1O2−δ (GDC) were carried out by X‐ray diffraction, SEM‐EDS, and electric conductivity measurements. The Sr‐ion deficient LSGMs have a lower reactivity against the formation of high‐resistivity phases than the stoichiometric (x = 0.00) LSGM. The reaction layer formed at the interface of LSGM and GDC during the sintering process due to the mutual diffusion of the cations was classified into five layers depending on the composition. The introduction of the Sr‐ion deficient LSGM suppressed the formation of the highly resistive Sr‐rich (La1+xSr1−x)Ga3O7−δ phase. It was suggested that the Sr‐ion deficient LSGM (La0.8Sr0.2−xGa0.8Mg0.2O2.8−δ) of x = 0.15 was the best composition for suppressing the reaction with the GDC interlayer while retaining a relatively good electric conductivity.

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Section: Ishii Et Almentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of A‐site ion nonstoichiometry on the chemical stability and electric conductivity of strontium and magnesium‐doped lanthanum gallate

et al. 2019

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“…In addition, the high diffusivity of the grain boundaries results in high conductivities and low activation energies that make possible to reduce the working temperature of these devices [40][41][42][43][44][45][46]. Thus, this original approach constitutes a good alternative for processing materials as electrolytes in SOFC applications which can successfully operate at intermediate temperatures (600 ºC-800 ºC).…”

Section: Proton Conductivity In Oxides (Based On Work From the Solidmentioning

confidence: 99%

Recent advances in perovskites: Processing and properties

Moure

Peña

2015

Progress in Solid State Chemistry

161

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The perovskite structure is one of the most wonderful to exist in nature. It obeys to a quite simple chemical formula, ABX 3 , in which A and B are metallic cations and X, an anion, usually oxygen. The anion packing is rather compact and leaves interstices for large A and small B cations. The A cation can be mono, di or trivalent, whereas B can be a di, tri, tetra, penta or hexavalent cation. This gives an extraordinary possibility of different combinations and partial or total substitutions, resulting in an incredible large number of compounds. Their physical and chemical properties strongly depend on the nature and oxidation states of cations, on the anionic and cationic stoichiometry, on the crystalline structure and elaboration techniques, etc.In this work, we review the different and most usual crystalline representations of perovskites, from high (cubic) to low (triclinic) symmetries, some well-known preparation methods, insisting for instance, in quite novel and original techniques such as the mechanosynthesis processing. Physical properties are reviewed, emphasizing the electrical (proton, ionic or mixed conductors) and catalytic properties of Mn-and Co-based perovskites ; a thorough view on the ferroelectric properties is presented, including piezoelectricity, thermistors or pyroelectric characteristics, just to mention some of them ; relaxors, microwave and optical features are also discussed, to end up with magnetism, superconductivity and multiferroïsme.Some materials discussed herein have already accomplished their way but others have promising horizons in both fundamental and applied research.To our knowledge, no much work exists to relate the crystalline nature of the different perovskite-type compounds with their properties and synthesis procedures, in particular with the most recent and newest processes such as the mechanosynthesis approach. Although this is not intended to be a full review of all existing perovskite materials, this report offers a good compilation of the main compounds, their structure and microstructure, processing and relationships between these features.

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“…In literature, it has been reported that La 1‐ x Sr x Ga 1‐ y Mg y O 3‐δ is a promising electrolyte for intermediate temperature (600 ~ 800°C) SOFCs owing to its excellent properties of high ionic conductivities (reaching as high as 0.11 S cm −1 at 800°C for La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 ) and negligible electronic conductivities under a wide range of oxygen partial pressure (about 1 ≥ P O2 ≥10 −21 atm) . However, a poor chemical compatibility between La 1‐ x Sr x Ga 1‐ y Mg y O 3‐δ electrolytes and some electrodes (Ni‐based anode or Co‐contained cathode) has been also verified, which would thus lead to a considerable power loss for the resultant SOFCs.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and electrical conductivity of La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85‐Ce_0.8Gd_0.2O_1.9 composite electrolytes for SOFCs

Lin

et al. 2018

Int J Applied Ceramic Tech

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(100‐x) wt.% La0.9Sr0.1 Ga0.8Mg0.2O2.85 ‐ x wt.% Ce0.8Gd0.2O1.9 (x = 0, 5, 10, 20) electrolytes were prepared by solid‐state reaction. The composition, microstructure, and electrical conductivity of the samples were investigated. At 300 ~ 600°C, the pure La0.9Sr0.1 Ga0.8Mg0.2O2.85 electrolyte has a higher conductivity compared to the composite electrolytes, but at 650 ~ 800°C the 95 wt.% La0.9Sr0.1 Ga0.8Mg0.2O2.85 ‐ 5 wt.% Ce0.8Gd0.2O1.9 composite electrolyte presents the highest conductivity, reaching 0.035 S cm−1 at 800°C. The cell performances based on La0.9Sr0.1 Ga0.8Mg0.2O2.85‐Ce0.8Gd0.2O1.9 electrolytes were measured using Sr2CoMoO6‐La0.9Sr0.1 Ga0.8Mg0.2O2.85 as anode and Sr2Co0.9Mn0.1NbO6 ‐La0.9Sr0.1 Ga0.8Mg0.2O2.85 as cathode, respectively. At 800°C, the measured open‐circuit voltages are higher than 1.08 V, and the maximum power density and current density of the fuel cell prepared with 95 wt.% La0.9Sr0.1 Ga0.8Mg0.2O2.85 ‐ 5 wt.% Ce0.8Gd0.2O1.9 electrolyte reach 192 mW cm−2 and 720 mA cm−2, respectively.

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Correlation between electrical and mechanical properties in La1−xSrxGa1−yMgyO3−δ ceramics used as electrolytes for solid oxide fuel cells

Cited by 22 publications

References 38 publications

Effect of A‐site ion nonstoichiometry on the chemical stability and electric conductivity of strontium and magnesium‐doped lanthanum gallate

Effect of A‐site ion nonstoichiometry on the chemical stability and electric conductivity of strontium and magnesium‐doped lanthanum gallate

Recent advances in perovskites: Processing and properties

Microstructure and electrical conductivity of La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85‐Ce_0.8Gd_0.2O_1.9 composite electrolytes for SOFCs

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Correlation between electrical and mechanical properties in La1−xSrxGa1−yMgyO3−δ ceramics used as electrolytes for solid oxide fuel cells

Cited by 22 publications

References 38 publications

Effect of A‐site ion nonstoichiometry on the chemical stability and electric conductivity of strontium and magnesium‐doped lanthanum gallate

Effect of A‐site ion nonstoichiometry on the chemical stability and electric conductivity of strontium and magnesium‐doped lanthanum gallate

Recent advances in perovskites: Processing and properties

Microstructure and electrical conductivity of La0.9Sr0.1 Ga0.8Mg0.2O2.85‐Ce0.8Gd0.2O1.9 composite electrolytes for SOFCs

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Product

Resources

About

Microstructure and electrical conductivity of La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85‐Ce_0.8Gd_0.2O_1.9 composite electrolytes for SOFCs