Carbon Monoxide Experiment

Abstract

The changes which are the result of presence of Carbon monoxide in HT-PEMFCs has been studied and was expressed I terms of numbers. Carbon monoxide interferes with the anodic reaction in fuel cells as it adsorbs on the surface of platinum electrode. Also the main focus is to determine the order of reaction of the hydrogen adsorption and desorption on the surface of the platinum electrode and this reaction is influenced by the amount of CARBON MONOXIDE in the electrode

Summary

The effect of carbon monoxide poisoning in fuel cells depends on the operational temperature of the cell. To preserve carbon monoxide poisoning in cells the concentration of carbon monoxide must be kept at lower ppm levels. Increasing the cell operational temperature,

experiments estimated CO poisoning losses in a half-cell. The voltage loss due to this poising was equal in size to the ratio of CO to hydrogen concentrations, however it increased at a lower temperature, higher current density and higher CO fraction In their conclusion they gathered that these deviations were due to stronger adsorption of CO. Iwase and Kwatsu proved the impact of hydroxide on CO poisoning formed from training species on the anode side. They discovered that the adsorption of hydroxide on the PF surface is favorable at higher temperature Because of this CO enhances to CO2 and results to CO poisoning Baschuk and Li provided a fully informed overview of experiments and theoretical modeling of phenomena in fuel cells- emphasizing the lack of key CO poisoning processes in the models; in this case CO oxidation and the resultant species transport were often

The models that are mentioned do not account for the temperature dependence of the CO poisoning effects on fuel cells; this may be due to particularly to the absence of adequate experimental data for the effects of the temperature and concentration of CO. Because of the strong temperature dependence of CO poisoning, an accurate prediction of CO poisoning of different operation temperatures is very crucial .In the study, 3D CO poisoning model for HT-PEMFCs is represented. Special emphasis is put on model validation detailed CO poisoning analysis on the temperature range of interest in HT-PEMFC operations Jiao et al gave the temperature dependence correlations for the adsorption and desorption kinetics of hydrogen and CO and they are newly combined with the CO fractional coverage correlation provided by Springe et al.

It is suggested in this study that kinetics of hydrogen adsorption/desorption processes are taken into account unlike the previous study

Moreover, experiment by Dal et al. show severer CO poisoning at higher current densities even at fixed operating temperature and CO content. To obtain experimental trends, improved CO poisoning model is used.The study helps in explaining more clearly the characteristics of CO and H2 adsorption/desorption and the sequent electro-oxidation on the anode catalyst and also helps to identify the