Electrical Property, Crystal Structure and Oxygen Nonstoichiometry of La&lt;sub&gt;1-&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Sr&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Co&lt;sub&gt;0.2&lt;/sub&gt;Fe&lt;sub&gt;0.8&lt;/sub&gt;O&lt;sub&gt;3-&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;δ&lt;/sub&gt;&lt;/i&gt;

Mineshige, Atsushi; Izutsu, Junko; Nakamura, Maiko; Nigaki, Kengo; Kobune, Masafumi; Fujii, Satoshi; Inaba, Masaaki; Ogumi, Zempachi; Yao, Takeshi

doi:10.5796/electrochemistry.68.515

Cited by 13 publications

(5 citation statements)

References 11 publications

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“…La 1Ϫx Sr x Co y Fe 1Ϫy O 3Ϫ␦ ͑LSCF͒ doped perovskites based on LaCoO 3 have attracted considerable attention over the last twenty years [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] as an alternative material for intermediate-temperature solid oxide fuel cell ͑IT-SOFC͒ electrodes, and other solid-state electrochemical devices. However, La 1Ϫx Sr x Co 1Ϫy Fe y O 3Ϫ␦ cathodes cannot be used in conventional SOFCs because of the formation of strontium zirconate when applied on YSZ electrolytes.…”

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confidence: 99%

“…This decrease in conductivity is attributed to the increase in oxygen nonstoichiometry arising from a decrease in the concentration of p-type charge carriers at high temperatures and low p O 2 . 6,10,25 At room temperature La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3Ϫ␦ is stoichiometric ͑i.e., ␦ Ϸ 0) 7,11 and becomes nonstoichiometric only at T Ͼ 600°C and p O 2 Ͻ 1.3 ϫ 10 Ϫ3 atm. 11 At 800°C, 3Ϫ␦ is equal to 2.98 7 in air and 2.93 for p O 2 ϭ 1.4 ϫ 10 Ϫ3 atm.…”

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confidence: 99%

“…However, at 800°C, the nonstoichiometry of LSCF͑6428͒ shows a high p O 2 dependence in the range 3.5 ϫ 10 Ϫ3 Ͻ p O 2 Ͻ 1 atm. 10 Strontium doping increases the oxygen vacancy concentration while cobalt doping increases the electronic conductivity, 26 though increased conductivity is coupled with increased thermal coefficient expansion and stability problems at high temperatures. 26,27 However, there remains a lack of understanding of the behavior of LSCF cathodes, particularly at temperatures at or below 600°C, as well as a lack of unity in the published data.…”

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confidence: 99%

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Electrochemical Characterization of La[sub 0.6]Sr[sub 0.4]Co[sub 0.2]Fe[sub 0.8]O[sub 3] Cathodes for Intermediate-Temperature SOFCs

Esquirol

Brandon

Kilner

et al. 2004

J. Electrochem. Soc.

444

250

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The electrochemical properties of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 ͑LSCF͒ have been assessed for its application as a cathode in intermediate-temperature solid oxide fuel cells. van der Pauw dc conductivity, two-electrode impedance, and three-electrode measurements were carried out to investigate the kinetics of the oxygen reduction reaction at various temperatures, oxygen partial pressures, and polarization values. A change in cathode behavior at temperatures around 600°C was observed. This is interpreted in terms of LSCF behaving as a mixed ionic electronic conductor at temperatures above around 600°C, oxygen reduction being stimulated by the formation of oxygen vacancies with increasing cathode overpotential. However, at temperatures below 600°C the contribution of mixed conductivity is low, and cathode behavior can then be interpreted in terms of the classical triple-phaseboundary model.

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Electrochemical Characterization of La[sub 0.6]Sr[sub 0.4]Co[sub 0.2]Fe[sub 0.8]O[sub 3] Cathodes for Intermediate-Temperature SOFCs

Esquirol

Brandon

Kilner

et al. 2004

J. Electrochem. Soc.

444

250

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“…Recently Jiang summarized the literature data regarding the characterization of the oxide materials from the lanthanum strontium cobaltite ferrite (La,Sr)(Co,Fe)O 3 − δ series, and showed that the composition La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ (the acronym LSCF will be used from now on), as a representative of MIECs, is the most prominent cathode material used in IT-SOFCs [33]. LSCF, which has a perovskite structure with rhombohedral distortions [73,74], exhibits excellent electrical properties properties with ionic and electron partial conductivity values reaching approximately 1 × 10 −2 S cm −1 and 1 × 10 2 S cm −1 , respectively, at 800 • C [75]. It demonstrates a moderate CTE value equal to 17.5 × 10 −6 K −1 in the range of 30-1000 • C [76].…”

Section: Key Functional Properties Of Lsm and Lscf Electrode Material...mentioning

confidence: 99%

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

Филонова

Pikalova

2023

Materials

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The progressive research trends in the development of low-cost, commercially competitive solid oxide fuel cells with reduced operating temperatures are closely linked to the search for new functional materials as well as technologies to improve the properties of established materials traditionally used in high-temperature devices. Significant efforts are being made to improve air electrodes, which significantly contribute to the degradation of cell performance due to low oxygen reduction reaction kinetics at reduced temperatures. The present review summarizes the basic information on the methods to improve the electrochemical performance of conventional air electrodes with perovskite structure, such as lanthanum strontium manganite (LSM) and lanthanum strontium cobaltite ferrite (LSCF), to make them suitable for application in second generation electrochemical cells operating at medium and low temperatures. In addition, the information presented in this review may serve as a background for further implementation of developed electrode modification technologies involving novel, recently investigated electrode materials.

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“…Solid oxide fuel cell (SOFC) is expected as one of promising next-generation power sources because of its high efficiency. In the state-of-the-art cell, mixed ionic and electronic conductors (MIECs), such as (La, Sr)(Co, Fe)O 3-δ , are typically utilized for the cathode (1)(2)(3)(4). In an SOFC MIEC cathode, the electrochemical reaction is thought to proceed not only at the triple phase boundaries (TPBs: gas/electrode/electrolyte) but also on the electrode surface, i.e.…”

Section: Introductionmentioning

confidence: 99%

Contribution of Triple-Phase Boundary Reaction in Cathodic Reaction of Solid Oxide Fuel Cell

et al. 2017

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The cathodic reaction of a solid oxide fuel cell (SOFC) was investigated by 18 O/ 16 O isotope exchange with/without polarization and isotopic distribution analysis by second ion mass spectroscopy. In order to elucidate the contribution of triple phase boundary (TPB) reaction while eliminating the influence of the electrode microstructure, a patterned thin film electrode was used as a model cathode. La 0.6 Sr 0.4 CoO 3-δ was chosen as a model material exhibiting mixed ionic and electronic conduction. A slight increase in the 18 O ratio was observed within 20 µm from the electrode/electrolyte interface under a constant cathodic polarization of 220 mV at 973 K in 1 bar of P(O 2 ). Such an increase in the 18 O ratio was considered to be caused by the electrochemical oxygen incorporation. The contribution of the TPB reaction to the total cathode reaction was not clearly observed at least in applied experimental conditions.

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Electrical Property, Crystal Structure and Oxygen Nonstoichiometry of La<sub>1-</sub><i><sub>x</sub></i>Sr<i><sub>x</sub></i>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3-</sub><i><sub>δ</sub></i>

Cited by 13 publications

References 11 publications

Electrochemical Characterization of La[sub 0.6]Sr[sub 0.4]Co[sub 0.2]Fe[sub 0.8]O[sub 3] Cathodes for Intermediate-Temperature SOFCs

Electrochemical Characterization of La[sub 0.6]Sr[sub 0.4]Co[sub 0.2]Fe[sub 0.8]O[sub 3] Cathodes for Intermediate-Temperature SOFCs

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

Contribution of Triple-Phase Boundary Reaction in Cathodic Reaction of Solid Oxide Fuel Cell

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