Electrical connection between the wire and electrode in MFC/MEC
I do not know this MEC system, but depends on how high is the values to the first points of the real impedance. This can indicate how is the electrical resistance of your system/electrode. For resistive electrodes such glassy carbon the estimates values are around the 2000 ohm.centimeter square. I hope that I can help a little.
Check the resistance of the electrodes (between the wire with carbon paper, graphite plate or cathode). The connection resistance can be important.
Before you setup them into the MFC/MEC, you should have resistances with Ti wire and materials on the order of:
Carbon paper with Ti wire: 0.8-1.8 ohm
Graphite plate with Ti wire: 1-2 ohm
Air cathode with Ti strap: about 5 ohm
If you find the resistance is over these values, you probably need to check what’s wrong. The followings are some tips for making a good connection:Remove the oxide layer on the surface of the Ti where is connected with the electrode using sandpaper. Before and after gluing the connection point, measure the resistance to see if the resistance is still around the above values.
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