Electronic transport properties of the perovskite-type oxides La1−xSrxCoO3±δ

Kozuka, H.; Yamada, Hideto; Hishida, Tomoko; Yamagiwa, Katsuya; Ohbayashi, Kazushige; Koumoto, Kunihito

doi:10.1039/c2jm34613c

Cited by 39 publications

(68 citation statements)

References 45 publications

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“…2) confirm La 1−x Sr x CoO 3 perovskite pure phase formation over the whole composition range of the solid solution (0 ≤ x ≤ 1). According to Kozuka et al [37], beside perovskite phase, for x = 0.9 in air, a secondary brownmillerite phase (Sr 2 Co 2 O 5 ) is obtained and for x = 1, a single brownmillerite phase is synthesized. However, plot of the c/a ratio is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, Kozuka et al [37] have shown that the perovskite structure is not stable for such high substitution rates, but Hancock and Slater [41] have shown that the cubic perovskite structure can be stabilized by substituting 3% cobalt by silicon.…”

Section: Methodsmentioning

confidence: 99%

“…Polycrystalline La 0.95 Sr 0.05 CoO 3 was first reported to have a high ZT value of 0.18 and S = 710 μV/K at room temperature [20], whereas more recent studies have found significantly lower thermopower values for this composition at the same temperature. For instance, Zhang et al [36], Kozuka et al [37], and Papageorgiou et al [38] have reported that S is about 250 μV/K. However, high ZT value of 0.19 has still been reported with S = 213 μV/K for La 0.9 Sr 0.1 CoO 3 nanowires [22].…”

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confidence: 96%

“…Moreover, the thermoelectric properties of ceramics with a cubic perovskite structure and x > 0.8 have never been investigated [37] whereas according to Koshibae et al [40], they should present high n-type thermoelectric properties.…”

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confidence: 99%

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Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSr x CoO3±δ (0 ≤ x ≤ 1)

et al. 2018

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Abstract:In this work, we synthesized cubic perovskite ceramics of the whole La 1-x Sr x CoO 3 (0 ≤ x ≤ 1) solid solution for the first time. Synthesis was carried out by solid state reaction and conventional sintering to reach dense ceramics. For x > 0.8, it was necessary to substitute 3% cobalt by silicon to stabilize the cubic perovskite structure. Electrical conductivity increased with Sr content to reach 3×10 5 S·m -1 at 330 K for x = 0.3. However, the optimum electrical properties have been found for x = 0.05 at 330 K with PF max = 3.11×10 -4 W·m -1 ·K -2 . Indeed, the Seebeck coefficient was decreasing when x increased to reach values close to 0 for x ≥ 0.3. Thermal conductivity was low at low temperature (≈ 2.5 Wm -1 ·K -1 ) and increased up to 6.5 W·m -1 ·K -1 when temperature increased. As the highest power factor was reached at low temperature as well as the lowest thermal conductivity, La 1-x Sr x CoO 3 compounds with low x values appeared as very promising thermoelectric materials around room temperature, on the contrary to layered cobalt oxides. For high x values, Seebeck coefficient values close to zero made these materials unsuitable for thermoelectric applications.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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confidence: 96%

mentioning

confidence: 99%

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Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSr x CoO3±δ (0 ≤ x ≤ 1)

et al. 2018

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“…These have found application in a wide range of electrical products, and though platinum or platinum group metals have traditionally been used as an internal electrode material, there is an increasing use of nickel (Ni) in this role. [1][2][3] The use of a ne Ni paste allows it to be sintered at the same time as the dielectric BaTiO 3 substrate. 4) However, the high speci c surface area of the Ni particles makes them chemically reactive and dif cult to handle.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sulfur on the Sintering of Nickel Particles

et al. 2016

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Sintering behavior of ne nickel powder with various surface sulfur content have been systematically investigated. The nickel powder with 150 ppm sulfur demonstrated the greatest density of the sinters, while the nickel powder with 300 ppm sulfur showed the lower density than the others. It was found that the appropriate content of surface sulfur enhanced the densi cation of ne nickel powder, which is mainly attributed the existence of solid solution sulfur in the nickel crystal structure. However, the excess sulfur beyond the solubility limit in nickel posed the formation of nickel sul des, and resulted in the lower density of nickel sinters.

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Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

Chen

Zhou

Ding

et al. 2015

Advanced Energy Materials

243

155

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Solid oxide fuel cells (SOFCs) represent one of the cleanest and most efficient options for the direct conversion of a wide variety of fuels to electricity. For example, SOFCs powered by natural gas are ideally suited for distributed power generation. However, the commercialization of SOFC technologies hinges on breakthroughs in materials development to dramatically reduce the cost while enhancing performance and durability. One of the critical obstacles to achieving high‐performance SOFC systems is the cathodes for oxygen reduction reaction (ORR), which perform poorly at low temperatures and degrade over time under operating conditions. Here a comprehensive review of the latest advances in the development of SOFC cathodes is presented: complex oxides without alkaline earth metal elements (because these elements could be vulnerable to phase segregation and contaminant poisoning). Various strategies are discussed for enhancing ORR activity while minimizing the effect of contaminant on electrode durability. Furthermore, some of the critical challenges are briefly highlighted and the prospects for future‐generation SOFC cathodes are discussed. A good understanding of the latest advances and remaining challenges in searching for highly active SOFC cathodes with robust tolerance to contaminants may provide useful guidance for the rational design of new materials and structures for commercially viable SOFC technologies.

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Electronic transport properties of the perovskite-type oxides La1−xSrxCoO3±δ

Cited by 39 publications

References 45 publications

Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSr x CoO3±δ (0 ≤ x ≤ 1)

Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSr x CoO3±δ (0 ≤ x ≤ 1)

Effect of Sulfur on the Sintering of Nickel Particles

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

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