Abstract
This work presents first experimental evidence on the effects of dynamic load cycle on PEM fuel cell system CO tolerance, a topic which to date has not been comprehensively investigated. The experiments were performed with a 1 kW fuel cell system employing components, design, and operation conditions corresponding to automotive applications. To distinguish between the load cycle and other factors affecting the CO tolerance, the experiments were repeated with static and dynamic load cycles, as well as with pure and CO contaminated fuel. The measurement data showed that dynamic load cycle improves the CO tolerance in comparison to static load with the same average current density. Moreover, the cell voltage deviation data indicated that the difference could be explained by higher electrochemical CO oxidation rate under the dynamic load cycle. These results allow us to estimate the effect of the load cycle on CO tolerance and understand its origins, thus giving valuable input for fuel quality standardization and fuel cell system development work.
Highlights
To cite this article: Pauli Koski et al 2022 J
Mechanism of Dynamic load cycle (DLC) induced Carbon monoxide (CO) tolerance.—As shown in the results, when CO tolerance is evaluated based on the mean cell voltage at 0.4 A cm−2 current density, the DLC used in this work improved the stack performance when compared to the static load cycle (SLC) operation
We see that the most feasible explanation for the increased CO tolerance is related to promotion of electrochemical oxidation of CO under the dynamic load cycle
Summary
To cite this article: Pauli Koski et al 2022 J. We do not think that there would be a significant difference in the amount of O2 diffusion or accumulation over a full load cycle, because the operation conditions, including cathode air flow rates and pressures, were on average very similar between the SLC and DLC cases.
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