A Fuel-Cell-Type Sensor for Detection of Carbon Monoxide in Reformed Gases

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Abstract
A solid oxide fuel cell using a samaria-doped ceria electrolyte with a Pd anode was fabricated for detecting carbon monoxide (CO) in reformed gases at 300°C. The CO concentration in a flowing mixture of 0-4000 ppm CO, 50% hydrogen, 10% carbon dioxide, and 6% water vapor was related to a decrease in both the electromotive force generated from the cell and the short-circuit current through the cell due to a reversible change in the anodic reaction resistance with the CO concentration. In both signals, the minimum detectable concentration was 50 ppm, and the 90% response and 90% recovery times were as short as 20 s. © 2001 The Electrochemical Society. All rights reserved.