What should be the effect of pH on the each component of the Randles equivalent circuit while studying the faradaic system using Fe(CN)6 -3/-4 as a redox couple?
Maybe the expected answer is "no significant effect"; reason: [H+] is not involved in the redox equilibrium. But you can read this paper:
http://www.fte.edu.iq/upload/upfile/ar/118122.pdf
to see that at extreme pH, something is happening, possible because the stability constants of the complexes involved in the redox reaction are affected by pH.
In my opinion it could change in almost all cases. Rs may change due to the conductivity (but in practice, if we have enough supporting electrolite, the changes because of the pH Will be not apreciable enough). Warburg Will change because it depends on the diffussion coefficient of the redox pair, which it probably Will change. About Rct and Cdl I'm not sure at all.
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