What valuable information can be extracted by performing EIS at different potential Vs OCP (let say performing around the redox peak region for an energy storage material). Also which is the preferred way to reach at that potential, by slow LSV to that potential or by directy giving input value of that potential. Link of any relevant paper regarding this is highly appreciable.
The primary data come from a combination of the two old (classic) techniques :
1. AC[1] complex Impedance Z(f) and
2. DC[2] (quasi-DC) i-E for electrodes (and Cells) measurements.
Thus we obtain certain E-parametric Z(f) spectra having more flexibility on enhanced 1)primary data plots as well as 2)models' parameter combinations. Also, we can measure in-situ Z(f) spectra of the E-modified (or other parameter) electrodes[2] . Some examples are Mott Schottky plot (as Artur Braun), enhanced 3D Tafel plots[2b] etc.[3]
Note : About the preferred way to reach at that potential: slow LSV (i.e. using small dEstep) is preferable. However the time constant of your target study will show how to find the best (-realistic) solution for E-range and dEstep.
1. http://www.gamry.com/application-notes/EIS/
2.a) http://www.gamry.com/application-notes/physechem/, b) http://www.gamry.com/application-notes/corrosion-coatings/corrosion-rate-efm-of-iron/
3. https://www.researchgate.net/publication/302961448_NEW_ELECTRICAL_METROLOGY_IN_INCANDESCENT_LAMPS%27_TUNGSTEN_WIRES
Conference Paper NEW ELECTRICAL METROLOGY IN INCANDESCENT LAMPS’ TUNGSTEN WIRES
Rct is due to resistance of electron transfer in between solution and electrode. Then when we are taking Rct at non faradic region (let say at 0 V in case of 0to 0.5V potential window) how it is giving the resistance corresponding to charge transfer. As any sort of charge transfer should give Faradic response. I found my doubt is relevant with this question. Please reply.
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