Hi, I'm working on cyclic voltammetry (CV) using a chemical.
The result was hard to explain as the CV showed a broad oxidation peak and a sharp reduction peak.
Additionally, those peaks were separated by more than 200 mV, so it seems the subjected redox reaction is not reversible.
When the scan rate was increased, the peak reduction potential was maintained, but the peak oxidation potential was shifted toward a positive direction.
What can be inferred from this CV?
I need the help of electrochemical experts.
Thank you:)
Seonjeong Cheon , My thoughts (Not expert, though):
Broad Oxidation peak: Oxidation reaction b/w the electrode&electrolyte is sluggish. (electrode cannot take electron efficiently)
Sharp Reduction peak: Electrode is efficient to reduce the chemical. (electrode can give the electrons to the electroylte efficiently.)
The 200mV separation is too much, but since you have both the peaks but one is very small and other is very large, the redox reaction is reversible ... but not efficient !
Maybe if you optimize the concentration of reduction and oxidation species in the electrolyte, the results may change !
Bests,
I am not an expert, so I apologize in advance if my answer seems trivial;
There may be some reactions that you are neglecting. Though you have not provided enough information regarding your analyte, electrolyte, anode, and cathode so I can't possibly know.
I find that these videos are quite informative.
https://www.youtube.com/watch?v=LiRqWcgJkb4
https://www.youtube.com/watch?v=8CudRJjsrhU&t=573s
- Badges
- Science topic
- Similar topics
- Physics
- Condensed Matter Physics
- Solid State Physics
- PEAKS