Hi,
I am working on Fuel Cells, especially SOFC. I am using a tool to model the SOFC. While providing data for Polarization Curves, the tool request for Limiting and Exchange Current Density for Hydrogen, Oxygen and Carbon Monoxide individually. I thought that these two parameters are specific to the Fuel Cell chosen. Literature & books I have verified so far has listed these two parameters concerning Fuel Cell of choice.
Is there something I am missing over here? I would be glad to learn and understand the theory & methods to estimate the limiting and exchange current density for the 3 elements H2, O2, & CO. I wanted to understand why did the tool choose limiting and exchange current density for 3 chemical elements H2, CO, O2 separately.
Thank you
Regards
Raghu
Dear Mr. Raghu Vamsi Kodaboina
Actually, I suggest you be more precise with your question.
Perhaps my answer however can help you I guess.
In the actual SOFC systems, fuels containing CO and various hydrocarbons associated with internal reforming can be used on the anode side. Internal reforming reaction and shift reaction should be then taken into account. i.e., CO(g)+H2O(g)⇌CO2(g)+H2O(g)
In addition, if CO(g) is involved in the electrochemical reactions, the corresponding reactions with CO should be taken into account.
In addition, I'd like you to learn formulating the exchange current density of SOFC electrodes as a function of equilibrium constants of adsorption and dissociation reactions, rate constants of electrochemical reactions, and gas partial pressures.
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