If the Nyquist and Bode plots do not show the expected behavior of the system, it is difficult for the user to pinpoint the cause of the problem (e.g. noise in the system, lack of sensitivity etc.).
With more precisions we could give you an righter answer.
Dear Priya,
We need more details.
How did you measure your sample? Were it only Pt electrodes painted on a pellet and then you performed IS? If so, then you have measured the resistance of the sample and the straight line is just the inductance of the measurement setup in my opinion.
In principle DC measurements are also fine for this, and should yield the same results as IS.
Best regards,
Sebastian
wow, Thank your Sir,
yahhhh, yes sir then its the inductance of the measurement.. and the resistance is determined from its Rp value where it becomes 0 ohms at the y axis then??
can we take its Rp value for conductivity calculations???????
A Nyquist plot showing high frequency inductive behavior.
The effects of inductances are often seen at the highest frequencies. The impedance of an inductor increases with frequency, while that of a capacitor decreases. High frequency inductive behavior has several possible causes. The easiest to visualize is the actual physical inductance of the wires and, possibly, of the electrode itself. I was surprised to find out the inductance of a straight piece of wire! Since the working electrode assembly often has a long wire or rod between the actual electrode surface and the potentiostat connections, this can be important if the electrode impedance is low.
Some batteries, formed by rolling a thin anode-electrolyte-cathode "sandwich" into a compact cylinder, may show these effects. These "stray" inductances are generally only a few microHenry (µH). However, since battery impedances are often low, these strays can be important.
Perhaps this answer will help you. You can also use this article where we have the relation beetwen impedance and Rp.
Best Regards
Dear Priya,
Were you succesful with your measurements? Are your results comparable to literature data?
Best regards,
Sebastian
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