Portal de Periódicos da CAPES

Lanthanide Nickelates Ln 2 NiO 4+ δ (Ln = La, Pr or Nd): Promising Cathode Materials For Metal Supported Cells

2013; Institute of Physics; Volume: 57; Issue: 1 Linguagem: Inglês

10.1149/05701.1771ecst

2151-2051

Jean‐Claude Grenier, Aurélien Flura, Sophie Dru, Clément Nicollet, Vaibhav Vibhu, Sébastien Fourcade, Aline Rougier, Jean‐Marc Bassat, A. Brevet, Julie Mougin,

Perovskite Materials and Applications

The cell manufacturing of Metal Supported Cells (MSC) for IT-SOFC application (typically 600 °C) requires to operate under non oxidizing conditions at high temperature (typically > 950 °C). The most sensitive layer appears to be the cathode one, usually a mixed ionic and electronic oxide. The behavior (TGA, XRD analyses, TECs) of the lanthanide nickelates Ln 2 NiO 4+δ (Ln = La, Pr or Nd) is reported when sintered at high temperature, under low pO 2 , down to 10 -4 atm. Electrochemical Impedance Spectroscopy measurements on Ln 2 NiO 4+δ //GDC//YSZ half cells sintered either in air or under argon at various temperatures show polarization resistance values that meet the target requirements (< 0.20 W.cm² at 600 °C), especially for La 2 NiO 4+ δ and Pr 2 NiO 4+ δ . These results are discussed in terms of structural and microstructural features.