Instead of starting on the real axis the curve begins below the axis. Does this signify the impedance of the connecting cable in 2-electrode configuration?
If you mean the highest frequency by 'start', then there is an inductive contribution from everywhere that is not your cell; the wiring and the potentiostat circuitry. The most likely culprit is the potentiostat's limited bandwidth, especially if low current ranges are used.
What is the magnitude of the impedance values you get, and what is the frequency range? There is hardly any meaningful information above 20 kHz (for an electrochemist). You can try forcing the potentiostat to a higher current range for wider bandwidth and increasing the integration time for the frequency response analyser.
Yes i meant the highest frequency. I tested the entire frequecy range from 1mHz to 1MHz.. How do i change the current range of the potentiostat to widen the bandwidth (Solartron0? Thanks for the help! The conductivity of my sample is around 5mS/cm.
I am not an expert on Solartrons, so either we wait for a comment from someone who knows how to use the potentiostat, or you consult the manual. If I recall correctly, the Solartron manuals should have a 'map' of sorts on the measurable impedance as a function of cell resistance and frequency.
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