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Journal of the Electrochemical Society, Vol.155, No.10, B1053-B1057, 2008
Amorphous ceramic material as sulfur-tolerant anode for SOFC
The amorphous LaMoO material was investigated as a sulfur-tolerant anode for solid oxide fuel cells (SOFCs), which was obtained by reducing the ionic conductor La2Mo2O9 in the SOFC anodic atmosphere. The performance of the amorphous anode was assessed using the electrolyte-supported cells with a 300 mu m thick La0.8Sr0.2Ga0.83Mg0.17O3-delta disk as the electrolyte and SrCo0.8Fe0.2O3-delta as the cathode. A single cell with the LaMoO anode achieved a maximum power density of 1.49 and 0.86 W/cm(2) in dry H-2 at 900 and 800 degrees C, respectively. Essentially, no decay in cell performance was observed over 100 h in both pure H-2 and H-2 containing 20 ppm H2S, indicating that the amorphous material is a potential sulfur-tolerant anode. The degradation of the LaMoO anode in a higher concentration of H2S was likely due to its chemical reaction with H2S. (C) 2008 The Electrochemical Society.