we have a double-chambered MFC that produced an OCV that reached 220 mV in 1 h, and was getting higher. after 24 hours the OCV dropped down, and I don't know why.

I want to measure the generated current first to plot the I-V curve, then the power density curve.

  • Is the OCV drop because we didn't use an external resistance? when should we start applying it to the MFC? can someone explain it in details please.
  • How to decide whether to use a fixed resistance over time, or to use a range of different resistances to carry out these measurements (I-V Curve, Power density Curve)?
  • I'm using a digital Multimeter for recording Voltage across either fixed or varied resistors.

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