Hi all,
Am working on a biocathode MEC(microbial electrolysis cell). To close my circuit, i have connected my cathode in series to a 10Ohm resistance and to the negative pole of a power supply and then from the positive pole of the power supply to the anode. Voltage in different points and current of the system are monitoring and recording by a multichannel multimeter in my whole system. to be able to record anodic and cathodic voltage, i have inserted two commercial Ag/AgCl reference electrode, RE-5B, Basi, in each of the chambers and connect one channel of my multimeter to anode and its refence electode, and another channel of multimeter to cathode and its reference electrode as well. the problem is the data which is recorded now, for me, i thought that difference between anode and cathode voltage(the latter which is recorded against reference electrode) should be equal to MEC voltage(applied voltage of power supply), but data is not logic. Would you kindly give me your hints if am wrong in any part.
Thanks
If there is any current flowing, your 10 ohm resistor will have a a voltage drop across it which you'll have to subtract from the power supply applied voltage to see what's left between the electrodes.
Another potential problem is whether your reference electrodes read 0V in relation to each other - if not, and you're measuring electrode potentials to two respective reference electrodes, you may not sum to zero.
Let me know if I don't understand your setup correctly.
Thanks dear Rob for ur attention, actually I havent checked if their voltage against each other is 0V or not before inserting in chambers. Now they are in different chambers of anode and cathode, dont know is Ok if i check their potential against each other if they are into different solutions. by the way, the drop across resistor is fine, i dont have any issue about it. my problem is that: I have applied 0.7 V to the MEC and now i believe that difference between V of cathode and Voltage of anode should be around applied voltage, but its not at all. i wanna see the way that I am measuring voltage of electrode against reference electrode is in the right way?
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