Co Poisoning Case Study

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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,…show more content…
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…show more content…
All the different reactions have different equations which are conveyed as a function of temperature. Desorption and absorption are the function of the amount of CO coverage and also temperature, other parameters are assumed to be constant. Surface coverage of Pt. anode by CO and hydrogen results in reduction occurring at the anode, therefore changes in current density should be made. In a HT-PEMFC there is a channel which contains isothermal boundaries and the walls of the cathode and anode that monitor the temperature for the calculations In order to be able to fully explain the experimental data by Dhat et al curves of voltage versus current density. Due to uncertainty on the order of reaction of hydrogen reactions at the anode both plots of first and second order were constructed. The plot for second order best represented the experimental data and for first order reaction the CO poisoning was measured to be less than the expected c\value when current density is around 0.2-0.3 A/cm2 By comparison of the curves it could be seen that the effect of CO poisoning is inversely proportional to temperature. It was also evident that hydrogen desorption decreases with increasing current

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