for an electrolytic cell you should use the thermo-neutral potential (ETN) as the "E0" for defining the over potential i.e. overpotential = Eapplied - ETN. For galvanic cells, the DeltaG0/-nF = E0 is used to define the overpotential i.e. overpotential = Eapplied - E0.
A dilemma or conundrum exists here in regard to the drop in battery voltage upon discharging. It can easily be shown that as we raise the circuit resistance, we experience less polarization of the two electrodes towards each other (and this co-polarization of the electrodes is what causes this apparent battery voltage drop) under loading/discharge. In other words if we short circuit the external battery circuit and/or reduce the internal electrolyte resistance in the battery, there is more polarization of the terminals upon loading which reduces the overall voltage more. So now we have a situation where the less actual IR drop that actually occurs in the circuit causes more, not less, battery voltage drop upon discharge which you are calling "IR drop". So therefore the lower the resistance is, the higher what you call "IR drop" is. This does not make sense.
Hi there, I'm not sure if I understand what you mean. When there's less resistance, the electrode will experience less overpotential due to resistance.
You are not considering activation polarization (sometimes called kinetic polarization). When there is no resistance at all, the potentials of the anode and cathode come together to the same value (there is more activation polarization which is proportional to LogI for both the anode and the cathode). The amount of activation polarization is proportional to the log of current flow. IR drop is shown on Evans diagrams as the difference between the anode and cathode potentials after current flow creates polarization.
@@bobstevens7028I'm still trying to understand the context of your writeup. Activation polarization is indeed not considered in the IR drop. It's an additional contribution on top of IR drop, which was indicated in the figure.
for an electrolytic cell you should use the thermo-neutral potential (ETN) as the "E0" for defining the over potential i.e. overpotential = Eapplied - ETN.
For galvanic cells, the DeltaG0/-nF = E0 is used to define the overpotential i.e. overpotential = Eapplied - E0.
Correction: I mislabeled the axes of the CV on the slide that talks about "Ohmic Overpotential". Sorry for the confusion!
A dilemma or conundrum exists here in regard to the drop in battery voltage upon discharging. It can easily be shown that as we raise the circuit resistance, we experience less polarization of the two electrodes towards each other (and this co-polarization of the electrodes is what causes this apparent battery voltage drop) under loading/discharge. In other words if we short circuit the external battery circuit and/or reduce the internal electrolyte resistance in the battery, there is more polarization of the terminals upon loading which reduces the overall voltage more. So now we have a situation where the less actual IR drop that actually occurs in the circuit causes more, not less, battery voltage drop upon discharge which you are calling "IR drop". So therefore the lower the resistance is, the higher what you call "IR drop" is. This does not make sense.
Hi there, I'm not sure if I understand what you mean. When there's less resistance, the electrode will experience less overpotential due to resistance.
You are not considering activation polarization (sometimes called kinetic polarization). When there is no resistance at all, the potentials of the anode and cathode come together to the same value (there is more activation polarization which is proportional to LogI for both the anode and the cathode). The amount of activation polarization is proportional to the log of current flow. IR drop is shown on Evans diagrams as the difference between the anode and cathode potentials after current flow creates polarization.
@@bobstevens7028I'm still trying to understand the context of your writeup. Activation polarization is indeed not considered in the IR drop. It's an additional contribution on top of IR drop, which was indicated in the figure.
Thank you, very helpful :)
doing good man, good info
Can you please explain ORR?
can you make a video on tafel plots??
I can give it a shot. May I ask your field of study, please?
@@ruocun2615 about hydrogen evolution activity
Thank you, helped me a lot :)
Thank you!
can you help me in analyzing the CV ?
Book name or available this book in internate
Electrochemical Methods
I can deal with the pace, but will more appreciate if you talk clearly
Sure, I will try to improve. Thanks.
Can you explain more easily!
I suggest you go read "Electrochemical Methods" by Allen J. Bard.