Perovskite and A₂MO₄-type oxides as new cathode materials for protonic solid oxide fuel cells

Julian Dailly (1) , Sébastien Fourcade (1) , Alain Largeteau (1) , Fabrice Mauvy (1) , Jean-Claude Grenier (1) , Mathieu Marrony (2)

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

Solid state ionic devices based on high-temperature proton conductors can be used for various applications, especially in a new class of fuel cells, the Protonic Ceramic Fuel Cell (SOFC-H⁺). These systems are currently operating at intermediate temperatures (500–600 °C) and one of the major problems is the overpotential at the cathode side. In this context, various perovskite oxides AMO_3 − δ (A = La, Ba, Sr; M = Mn; Fe, Co, Ni) and A₂MO₄-type compounds (A = La, Nd, Pr or Sr; M = Ni) have been investigated. Their properties under moist cathodic atmosphere have been studied. Actually, they are stable and exhibit high electrical conductivity (σ > 100 S cm⁻¹) as well as good electrocatalytic properties towards oxygen reduction. The electrochemical properties of these oxides deposited on the protonic electrolyte BaCe_0.9Y_0.1O_3 − δ have been studied and the Area Specific Resistances have been measured under air/H₂O (3%) atmosphere. The obtained values at 600 °C, especially for Ba_0.5Sr_0.5Fe_0.8Co_0.2O_3 − δ and Pr₂NiO_4 + δ show to be promising cathode materials for Protonic Ceramic Fuel Cell applications.

Mots clés: SOFC-H+; Cathode material; Electrical conductivity; Impedance spectroscopy

Domaines: Matériaux

Julian Dailly, Sébastien Fourcade, Alain Largeteau, Fabrice Mauvy, Jean-Claude Grenier, et al.. Perovskite and A₂MO₄-type oxides as new cathode materials for protonic solid oxide fuel cells. Electrochimica Acta, 2010, 55 (20), pp.5847-5853. ⟨10.1016/j.electacta.2010.05.034⟩. ⟨hal-00505788⟩