I want to calculate theoretical voltage of a Solid Oxide Fuel Cell fed by hydrogen (50 % in mol) at anode side and air at the cathode.
How can i do it?
Thanks a lot for the help
Best Regards
Simple
Use Nernst Equation. Standard Electrode Equilibrium Potential (E^0) is 1.229V for a H2-O2 fuel cell. Just be sure to use 0.21 for oxygen activity in air. Also if you have specific partial pressures at which you supplied the reactant gases, use their activity as well. Although, since the pressure terms appear in natural logarithm, so their effect on the reversible voltage calculation will be minimal.
Good luck
Consider SOFC as a black box with Air and H2 (+ something else) - input ; depleted air and the rest of H2, H2O, +something else (if any) - output. An ideal condition means that the temperature is constant and delta G = We (free Gibbs energy = electric power). Then, V=deltaG/(n(O2)*Ne* F), where n(O2) - moles of O2 that penetrate through membrane; Ne = 4 (electrons per mol of O2), F - Faraday constant. Please, see details in
Granovskii M., I. Dincer and M.A. Rosen. Exergy analysis of gas turbine cycle with steam generation for methane conversion within solid oxide fuel cells. Journal of Fuel Cell Science and Technology. 5, 031005(2008)
The SOFC stack output voltage can be described by the Nernst equation (eq. (13)) in the following paper.
Conference Paper Modeling and analysis of grid connected fuel cells (FCs) as ...
Note: there was a typo in the paper file, but it is corrected in the presentation file (Data FC Corrected Presentation
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