When I measured the cyclic voltammogram of palladium in the pbs solution, two reduction peaks appeared. This did not match the literature I saw. Why?
And how can I find the possible reaction mechanism of these two reduction peaks?
Multiple peaks sometimes denotes cascade of redox activities of same or different species present in the solution matrix at the electrode surface. it could means different oxidation states of the species. It could also be a function of the scan rate used. So ensure the solution is void of impurities and try series of scan rates. Sometimes it could be as a result of the complexation of the metal ion with a ligand or radical. hope this help.
Which experimental conditions, which palladium, and which literature are to be defined well to get high quality answers from experts.
Your question is general, you should give more information about your system and which application you use to get this curve. example: MOR, EOR or EGOR etc.
generally when the surface active size of Pd is covered by poisoning intermediate species that will definitely appears in the CVs curve in addition to agglomeration of Pd.
Please check these papers:
1- Article Carbon supported PdSn nanocatalysts with enhanced performanc...
2- Article Highly active Pd containing EMT zeolite catalyst for indirec...
3- Article Preparation of Bifunctional Au-Pd/TiO 2 catalysts and resear...
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