The effects of various fuel and air impurities on the performance of tubular solid oxide fuel cells have been examined. Two-cell SOFC tests were conducted using simulated coal gas contaminated with 1 ppm H 2 S, 1 ppm HCl, and 5000 ppm NH 3 . Of these only H 2 S was found to have a significant effect. Another two-cell test was conducted in which the effect of SiO 2 carryover into fuel electrode was examined. Testing was also conducted to investigate the effects of copper on nickel containing

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... components. Three different air impurities were examined. Single cell testing was performed using air contaminated with sulfur dioxide, with extremely high levels of water vapor, with water vapor and sulfur dioxide, and with sea water mist. vii CONTENTS