Electrochemical study of the Nd_1.95NiO_4 + δ/oxide electrolyte interface

Fabrice Mauvy (1) , Cécile Lalanne (1) , Jean-Marc. Bassat (1) , Jean-Claude Grenier (1) , Annabelle Brisse (2) , Anne-Laure Sauvet (3) , Christelle Barthet (3) , Jacques Fouletier (4)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 EIFER - European Institute For Energy Research
3 CEA Le Ripault - CEA Le Ripault
4 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces

Nickelate-based oxides are potential cathodes in Solid Oxide Fuel Cells operating at intermediate temperatures. The chemical compatibility between apatite electrolyte, i.e., La₉Sr₁Si₆O_26.5, and Nd-deficient nickelate, i.e., Nd_1.95NiO_4 + δ, has been characterized. The equilibrium between the nickelate material and the gas phase has been studied as functions of temperature and oxygen partial pressure, using potentiometric measurements with microelectrodes, i.e., metallic or ceramic point electrodes. Two solid electrolytes were used, i.e., apatite and yttria-stabilized zirconia. The response of the nickelate is discussed in terms of oxygen stoichiometry.

Mots clés: SOFC; Nickelate; Apatite; Potentiometric measurements; Microelectrodes; Zirconia

Domaines: Matériaux

Fabrice Mauvy, Cécile Lalanne, Jean-Marc. Bassat, Jean-Claude Grenier, Annabelle Brisse, et al.. Electrochemical study of the Nd_1.95NiO_4 + δ/oxide electrolyte interface. Solid State Ionics, 2009, 180 (20-22), pp.1183-1189. ⟨10.1016/j.ssi.2009.06.011⟩. ⟨hal-00432652⟩