Could anyone help to solve my problem? I have recently investigated mesopourous layers of TiO2 on FTO in water electrolytes (just simple, known measuremensts) and I always observed an inductive loop, no matter what kind of solution and TiO2 paste I used (HCl, KCl, phosphate buffer). I couldn't find the answer in the literature. I have Ag/AgCl 1M referecnce electrode and a Platinum Wire as a counter electrode, H-type holder for PEC measurements is used. This is most probably the artifact, I don't observed these loops when I do measurements in solar cells configuration. This is a problem, cause I cannot estimate the Rsc of the semiconductor in this case.
The inductive loop observed below is for about 40 kHz.
The behaviour of such interfaces at high frequencies is not well described by conventional circuit elements. There are constant phase elements and Warburg elements in the responses at AC. I don't think you need worry about the loop in your plot IF you aren't concerned about the high frequency response (which you shouldn't be in a dye cell - their response is measured in seconds, not even milliseconds). If you want to investigate the loop, however, then that might be a project by itself. Read up on electrochemistry and the behaviour of such unconventional circuit elements to gain a greater understanding of what is happening. Best wishes with your research!
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