I have measured the electrochemical impedance by using three electrodes: a platinum foil as counter electrode, Hg/Hg2Cl2/(KCl) as reference electrode and Mo4O11/ITO as working electrode in a 1M LiClO4-PC solution, at the frequency range: 100 kHz - 100 mHz. But, my Nyquist plot didn't touch the x-axis (real part), even if I have tried to check at the higher frequencies (110 KHz to 1 MHz) and lower frequencies (< 100 KHz). So, does anyone know how to explain in this case? Everyone can see the image file of the Nyquist plot at the attached file.
Thank you so much!
From below paper, maybe can help to explain your question.
Int. J. Electrochem. Sci., 2 (2007) 444 - 461
Impedance Measurements of H2Mo2O3(O-O)4(H2O) 2
Impedance measurements in aqueous peroxo-molybdate solutions of pH below 2 suggest spatiotemporal oscillations.
Touch the axis depend on software you use to make graph. I can see the figure. You should set the unit in software
Most important is to measure the semicircle area
See the attached figure
At highest frequencies, where resistance of the solution is observed, it is difficult that impedance values get value of 0, it is neccesary to make an extrapolation. It is possible tthat impedance values cross 0 at lower frequencies, but it is related to other process.
- Badges
- Science topic
- Similar topics
- Engineering
- Electrical Engineering
- Electrodes