I was working on Microbial Fuel Cell (MFC) and was a little puzzled by the high power density for the Pt/C cathode. We saw that the Anode potentials were quite near -500 mV, which is more negative than that of the half cell potential for acetate oxidation at pH of 7 (assuming -200 mV versus a SHE). Any idea why it was so negative, and why the power density was so high relative to many other studies? I thought it could be a more saline (conductive) solution but I used 50 mM PBS, and hydrated forms of P, so that looks correct unless a non-hydrated phosphate salts were used, in which case it could be more like a 100 mM PBS.
Any body can help me about above matter?
Having different potentials of anode and cathode against a reference is the most common situation. You don't have to use these values in any calculations.
The current and power values are the same at anode and cathode (but the current/power densities depend on electrode areas.).
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