Currently, I am studying the electrocatalytic activity of transition metal oxides like NiCo2O4 for oxidation of methanol. The electrolyte used is 1M KOH and added 0.5M methanol to see the activity of NiCo2O4. I used GCE, Ag/AgCl, and Pt wire electrodes. But, most of the time when I repeat the CV experiment with the same condition the next day, I don't get the peaks or get very weak peaks. What is the possible reason for this type of inconsistency?
Thank you.
Electrochemistry is all about the properties of electrode surface. If you don't polish/clean the electrode, next day you are dealing with another electrode. Polishing/cleaning of any electrode is highly irreproducible procedure.The answer for question: each time when you start CV, you have different electrode surface
You must take the average of three replicate to ensure the reliability of your results using a new surface and fresh solution in each time.
it can be due to aging effect of binder. every-time prepare fresh binder and ink to use
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