Preparation and electrochemical characterization of Sr- and Mn-doped LaGaO₃ as anode materials for LSGM-based SOFCs

Author： Fu Q. Xu X. Peng D. Liu X. Meng G.

ISSN： 0022-2461

Source： Journal of Materials Science, Vol.38, Iss.13, 2003-07, pp. : 2901-2906

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Abstract

Sr- and Mn-doped lanthanum gallate powders (LSGMn, La_0.9Sr_0.1Ga_{1 - x}Mn_xO_{3 - δ}, x = 0.20, 0.35, 0.43) were prepared by glycine-nitrate combustion synthesis. X-ray diffraction patterns indicate the perovskite structure was formed without any second phase after calcining the powders at 1000°C for 4 h. Compacts of powders synthesized under stoichiometric combustion were sintered to densities over 95% of theoretical values. The electrical conductivity of this material in both air and H₂ were characterized using AC impedance spectroscopy. It showed that the conductivity in H₂ atmosphere is lower than that in air due to p-type electrical conduction in this material, and the electrical conductivity increases remarkably with increasing manganese content. Good chemical stability of La_0.9Sr_0.1Ga_{1 - x}Mn_xO_{3 - δ} in H₂ atmosphere as well as the relatively high conductivity makes it an appropriate anode material for Sr- and Mg-doped lanthanum gallate (LSGM)-based IT-SOFCs. Preliminary fuel cell performance measurements were performed, showing promising electrochemical properties of such anode materials.