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In my experiment a dual chambered MFC:

1. Open circuit Potential noted was0.71 volts. When measured for CCVand current at 10 K ohm, it showed 2-1 andfinally O.8 mAmps with large fluctuations along 0.68~0.63Volts of CCV with continuous downfall and somewhatstability.

Possible Reasons:May be due to the stored potential (0.71Volts asOCP--> Infinite resistance between two terminals cathode and anode, there remains no current flow), the cell acted fastidiously as faras current generation was concerned. But why there is continuousdownfall in the recorded CCV potential when there is load connectedin the circuit?. It seems as if the load is given permanently, theCCV will reach to its minimal point(could be 0 even). But if ithappens, then cell won't produce sustained energy for long time.

2.OCV was 0.70volts. Current recorded was in accordance with the firstreading.At 1 Kohm, CCV was around 0.46~0.42V with continuous rapid downfall with increasedfluctuated 3-2-1 and final0.7mAmps current. Final droppped OCVafter recordings were 0.32V.

Question:Can you justify the reasons of this endless downfall in CCV andcurrent?. And why its too hard to recover the same previous OCVquickly. It takes around 30 mins or above to reach the same previousOCV.