The CO poisoning effect on carbon-supported platinum catalysts in polymer electrolyte membrane fuel cells has been investigated in a temperature range from 125 to 200°C with the phosphoric acid-doped polybenzimidazole membranes as electrolyte. The effect is very temperature-dependent and can be sufficiently suppressed at elevated temperature. By defining a poisoning factor as less than 2% of power loss due to the poisoning effect, it is evaluated that 3% CO in hydrogen can be tolerated at current densities up to 0.7 A/cm2 at 200oC, while at 125oC 0.1% CO in hydrogen can be tolerated at current densities lower than 0.25 A/cm2. For comparison, the tolerance is only 0.0025 % CO (25 ppm) at 80°C at current densities up to 0.15 A/cm². The effect of CO2 in hydrogen was also studied. At 175°C, 25% CO2 in the fuel stream showed only the dilution effect.
|Title of host publication||Proceedings of the 2nd European PEFC Forum|
|Number of pages||848|
|Place of Publication||Switzerland|
|Publisher||Eueopean Fuel Cell Forum|
|Publication status||Published - 2003|
|Event||2nd European PEFC Forum - Lucerne, Switzerland|
Duration: 30 Jun 2003 → 4 Jul 2003
|Conference||2nd European PEFC Forum|
|Period||30/06/2003 → 04/07/2003|
Li, Q., He, R., Gao, J-A., Jensen, J. O., & Bjerrum, N. (2003). CO tolerance by the PEMFC operational at temperatures up to 200°C. In Proceedings of the 2nd European PEFC Forum (1 ed., Vol. Volume 1, pp. 253-262). Eueopean Fuel Cell Forum.