Investigations on stoichiometric and substoichiometric La1-x-γSrxMnO3-δ used as cathode material in the sold oxide fuel cellused as cathode material in the sold oxide fuel cell

Schachtner, R.; Ivers-Tiffée, Ellen; Weppner, W.; Männer, Ruth; Wersing, W.

doi:10.1007/bf02426010

Cited by 2 publications

(1 citation statement)

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“…The minimum polarization resistance of manganite cathodes at 1070-1270 K, observed in the range x ¼ 0.3-0.7, also tends to shift towards lower dopant concentrations when the temperature increases, and is close enough to the conductivity maximum. The introduction of an A-site cation deficiency increases the electrode performance due to a suppressed reactivity with zirconia electrolytes, a higher oxygen-vacancy content and, often, a faster ionic conduction [139,151,152,155,156].…”

Section: Perovskite-related Mixed Conductors: a Short Overviewmentioning

confidence: 99%

Oxygen Ion‐Conducting Materials

Хартон

Marques

Kilner

et al. 2009

Solid State Electrochemistry I

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Oxygen ionic and mixed ionic-electronic conductors find important applications in solid-state electrochemical devices, including sensors, solid oxide fuel cells, hightemperature electrolyzers, and oxygen separation membranes. This chapter presents a brief overview of oxide phases with high diffusivity of O 2À anions, providing an introduction to this fascinating topic. Particular emphasis is centered on the comparative analysis of ionic and electronic conductivity variations in the major groups of solid oxide electrolytes and mixed conductors, such as perovskite-and fluorite-related compounds, apatite-type silicates, and derivatives of g-Bi 4 V 2 O 11 and b-La 2 Mo 2 O 9 . The defect chemistry mechanisms relevant to the oxygen ion migration processes are briefly discussed. IntroductionTechnologies based on the use of high-temperature electrochemical cells with oxygen anion-or mixed-conducting ceramics provide important advantages with respect to the conventional industrial processes [1][2][3][4][5][6][7][8]. In particular, solid oxide fuel cells (SOFCs) are considered as alternative electric power generation systems due to high energy-conversion efficiency, fuel flexibility, and environmental safety [1][2][3]. Dense ceramic membranes with mixed oxygen-ionic and electronic conductivity have an infinite theoretical separation factor with respect to oxygen, and can be used for gas separation and the partial oxidation of light hydrocarbons [4,5,7,8] (these and other applications are reviewed in Chapters 12 and 13). For all types of electrochemical cells, the key properties which determine the use of a material are the partial ionic and electronic conductivities. As an example, solid electrolytes for SOFCs, oxygen pumps and electrochemical sensors should exhibit a maximum oxygen ionic conductivity, while the electronic transport should be minimal. In contrast, for SOFC electrodes Solid State Electrochemistry I: Fundamentals, Materials and their Applications. Edited by Vladislav V. Kharton

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Section: Perovskite-related Mixed Conductors: a Short Overviewmentioning

confidence: 99%