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This study describes a new CO sensor based on a proton exchange membrane for combustion applications over 100°C. One of the promising high-temperature polymers is based on the phosphoric acid doped polybenzimidazole ͑PBI͒ polymer. Output at less than 300 ppm CO was clearly detected using the PBI at around 200°C. Based on the polarization curves, the current density approximately linearly decreased with the decreasing voltage. It was found that the PBI had a high CO to H 2 selectivity in the combustor exhaust. The contributions of the anode and cathode electrodes to the output voltage are revealed using a normal hydrogen electrode. Sensor performance using the PBI was less influenced by the humidity than when using Nafion.

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