Electrochemical properties of perovskite and A₂MO₄ -type oxides used as cathodes in protonic ceramic half cells

Julian Dailly (1) , Fabrice Mauvy (1) , Mathieu Marrony (2) , Michel Pouchard (1) , Jean-Claude Grenier (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 EDF - EDF

Three selected materials have been prepared and shaped as cathode of half cells using the proton-conducting electrolyte BaCe_0.9Y_0.1O_{3 − δ} (BCY10): two perovskite compounds, Ba_0.5Sr_0.5Co_0.8Fe_0.2O_{3 − δ} (BSCF) and La_0.6Sr_0.4Fe_0.8Co_0.2O_{3 − δ} (LSFC), and the praseodymium nickelate Pr₂NiO_{4 + δ} (PRN) having the K₂NiF₄-type structure. The electrochemical properties of these compounds have been studied under zero current conditions (two-electrode cell) and under polarization (three-electrode cell). Their measured area-specific resistances were about 1-2 Ω cm² at 600 °C. Under direct current polarization, it appears that the three compounds show almost similar values of current densities at 625 °C; however, at lower temperatures, BSCF appears to be the most efficient cathode material.

Keywords: SOFC-H⁺; Perovskite; K₂NiF₄-type oxides; Cathode material; Impedance spectroscopy

Domains: Material chemistry

Julian Dailly, Fabrice Mauvy, Mathieu Marrony, Michel Pouchard, Jean-Claude Grenier. Electrochemical properties of perovskite and A₂MO₄ -type oxides used as cathodes in protonic ceramic half cells. Journal of Solid State Electrochemistry, 2011, 15 (2), pp.245-251. ⟨10.1007/s10008-010-1188-4⟩. ⟨hal-00580073⟩