Nowadays I am working on Polymer electrolyte fuelcell (PEFC). I am a chemical engineer so I don't have enough electrical/electrochemical engineering background. I have been reading 3 months about some points I need to understand but it seems like something is missing so I need to reach a certain point of knowledge from where I can explore more. I hope someone can help me with it.
I have two main questions:
1) I don't understand how the electrochemical measurement system (potentiostat / galvanostat) is controlling current or voltage measured from the cell. Does it apply a certain load from the system according to the requested current/potential from the cell, and hence it controls the load it applies?. As I imagine, in the open circuit, the system applies a very high load tends to infinity to prevent the flow of electrons, but in the case of cell "limiting current", the load tend to zero. Is that correct?. please explain if not.
2) The measurement system can change the current frequency to measure impedance, capacitance and inductance. If so, how the measurement system can separate between its own applied load and the resistance inside the cell itself caused by membrane, kinetics, diffusion, etc in the measured data?. and how the software translates the signal from the measurement system to plot real z versus imaginary z?.
I am sorry for the long questions.
Dear Madam
Glad to communicate with you!
Am from Biological Science back ground! I am attaching one presentation about electrochemistry.try to see some information.
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