화학공학소재연구정보센터
Journal of the Electrochemical Society, Vol.158, No.3, J71-J75, 2011
Performances of Fuel-Cell-Type CO Sensors Using Each of Polybenzimidazole and Nafion Membranes
This study describes a new CO sensor based on a proton exchange membrane for combustion applications over 100 degrees C. One of the promising high-temperature polymers is based on the phosphoric acid doped polybenzimidazole (PBI) polymer. Output at less than 300 ppm CO was clearly detected using the PBI at around 200 degrees 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. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3530838] All rights reserved.