Characterization of LSGM films obtained by electrophoretic deposition (EPD)

• Published in: Solid state ionics 2006-10, Vol.177 (19), p.1985-1989
• Main Authors: Sora, Isabella Natali, Pelosato, Renato, Simone, Antonia, Montanaro, Laura, Maglia, Filippo, Chiodelli, Gaetano
• Format: Article
• Language: English
• Subjects: Electrical properties; Electrophoretic deposition; Ionic conductivity; Lanthanum gallate; LSGM film
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2006.03.022

The application of the electrophoretic deposition (EPD) technique to the preparation of high quality electrolyte films for intermediate temperature solid oxide fuel cells (IT-SOFCs) was investigated. Films of La 0.83Sr 0.17Ga 0.83Mg 0.17O 2.83 (LSGM) were deposited on Pt and La 0.8Sr 0.2MnO 3 (LSM) substrates from suspensions in acetone/ethanol (3:1 by volume) mixture solvent and sintered at 1300 °C. Pt supported LSGM films, 10–20 μm thick, exhibited good adhesion to the Pt substrate, well-distributed microporosity and some surface roughness. LSM supported films exhibited cracking after sintering at 1300 °C for 3 h. Up to 900 °C the bulk conductivity of the Pt supported LSGM film showed the same behaviour of LSGM pellet ( E a = 0.93 eV and 0.99 eV, respectively). The LSGM film exhibited lower bulk electrical conductivity than the latter (4.1 × 10 − 3 and 4.4 × 10 − 2 Ω − 1 cm − 1, respectively, at 700 °C). This difference should be ascribed to the slight Ga depletion in the LSGM film. An important issue remains the selection of adequate electrode for LSGM electrolyte films.