Question

How to measure coulombic efficiency of electrolysis?

Answer 1

I would use the COD. The oxygen demand (in g/L or so) gives you the amount of oxygen that would be needed to fully oxidize the electrolysis compounds. Oxygen reduction requires two electrons ; you can thus calculate that into an electric charge required for an electrochemical oxidation of the electrolysis. You can now measure the actual charge from the MFC and put that into relation to the expeced charge from the delta COD.....