In SOFC, feeding a mixture of CO/H2 to the anode can lead to different possibilities like;
Electrochemical oxidation of H2 produces H2O at/around triple phase boundary (TPB), which can in turn stimulate water gas shift reaction and suppress direct oxidation of CO. So the total current produced can be consequence of reaction (1) and/or (2). Although, the rate of electrochemical oxidation of CO is 2-3 times slower than that of H2 at Ni based anodes, yet it can contribute significantly at higher current density.
Measuring CO2 composition at the anode outlet can be result of reaction (2) and/or (3). Also, apparently it is very difficult to quantify how much current is produced through reaction (1) and how much through reaction (2).
Is there any in situ characterization technique or any experimental way to figure out the extent of water gas shift reaction and extent of CO direct oxidation?
From the equations, H2 is only generated through the WGS reaction so it seems if you know the amount of H2, then would be able to calculate the amount of CO consumed through WGS by using reaction stoichiometric factors. (one mole of CO is consumed through the WGS to produce one mole of H2)
Somehow, I could not explain the question properly. Now I rephrased it, considering a mixture of CO/H2 fed to the anode.
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