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Titanates de structures pérovskite et dérivées : Influence des éléments constitutifs et de la dimensionnalité sur les propriétés d'anode SOFC

Abstract : SOFC anode materials working under methane have to display excellent catalytic properties for fuel oxidation without coke formation. The influence of the structure dimensionnality on catalytic and electrochemical properties was studied. After synthesis of the materials by a Pechini-type method and structural characterization by means of X-ray, neutron and electronic diffraction, the catalytic activation of samples toward methane steam reforming was pursued in slightly humidified methane (CH4:H2O=10:1). Electrical conductivity measurements were carried out in temperature and at low oxygen partial pressure. Then, the electrochemical response of these materials was evaluated by impedance spectroscopy using symmetrical and complete cell under humidified H2, under or without a current bias. Among all tested compounds, the best candidate is the x=0.80-member of the LaxSr1-xTiO3+δ family, which displays a lamellar structure exhibiting long range ordered over-stoichiometric oxygen. Low electrical performance when compared to 3D compounds (about 10-2 S.cm-1 at 1073K in Ar/H2(2%)), is compensated by very high catalytic and electrochemical activity.
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Submitted on : Tuesday, February 23, 2010 - 12:28:17 PM
Last modification on : Friday, November 6, 2020 - 3:35:06 AM
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Cédric Périllat-Merceroz. Titanates de structures pérovskite et dérivées : Influence des éléments constitutifs et de la dimensionnalité sur les propriétés d'anode SOFC. Matériaux. Université des Sciences et Technologie de Lille - Lille I, 2009. Français. ⟨tel-00459141⟩

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