4.6 Article

Ru exsolution in substituted La0.75Sr0.25Cr0.5Mn0.5O3-delta compound as anode material for an IT-SOFCs

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MATERIALS CHEMISTRY AND PHYSICS
卷 268, 期 -, 页码 -

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2021.124724

关键词

SOFC anode; Exsolution; MIEC; LSCM; Symmetrical cells

资金

  1. Direction Generale de l'Armement (DGA)
  2. region Pays de la Loire

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This study presents the synthesis of the LSC0.4MRu0.1 compound and compares its conductivity with LSCM and LSCM0.3Ni0.2. Results show that Ru substitution leads to increased total conductivity, while Ni substitution decreases conductivity. The reduced Ru-substituted compound shows potential for use as an anode material in SOFCs, but the high temperature decomposition and reduction processes should be carefully considered.
In this study, the synthesis of La0.75Sr0.25Cr0.4Mn0.5Ru0.1O3-delta a (LSC0.4MRu0.1) compound is presented and its total conductivity is measured and compared with that of La0.75Sr0.25Cr0.5Mn0.5O3-delta (LSCM) and the Ni-substituted compound La0.75Sr0.25Cr0.5Mn0.3Ni0.2O3-delta (LSCM0.3Ni0.2). While the substitution of Ni decreased LSCM conductivity under a reducing atmosphere, an increase of the total conductivity of Ru substituted phase is evidenced. The reduction of Ni and Ru-substituted LSCM under Ar/H-2 5% up to 800 degrees C or 1000 degrees C respectively leads to the exsolution of nanoparticles, but also to a slight decomposition for the Ru-substituted compound. However, the use of these reduced materials as anode for solid oxide fuel cell (SOFC) in symmetrical cells based on Ce0.9Gd0.1O1.95 (CGO) electrolyte implies not reducing the total system at a temperature higher than 600 degrees C to avoid ceria reduction. The solution consists of pre-reducing the electrode materials at their exsolution temperature before casting them on CGO thin disk. Under reductive atmospheres, Electrochemical impedance spectroscopy study of symmetrical cells suggests that the exsolution approach improves the adsorption of gaseous species compared to LSCM. LSC0.4MRu0.1 symmetrical cell exhibits the lowest polarization resistance, 0.087 Omega cm(2) under Ar/H-2 (5%) and 0.044 Omega cm(2) under methane at 600 degrees C.

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