Is it similar to that of the scan in positive potential? If a system A2+/A3+ has a redox potential of 0.2 V, then should the redox peak come at -0.2 V during the negetive potential scan. Please clarify.
There is a grea significance to the location and shape(or area) of the peaks. For example in a revesible system the area of the cathodic peak should be identical to the one of the anodic peak. If you change the scan rate you can get kinetic information on your system from the peaks. if the distence between the anodic peak and the cathodic peak is 57 mv then your system is reversible if not it can be irreversible or quasi (change the scan rate and see). From the average of the cathodic and anodic peaks you can measure the E0 of your system (or compare it to one). This is all basic CV knowladge I suggest you read some more background information
here is something very short:
http://www.ceb.cam.ac.uk/research/groups/rg-eme/teaching-notes/linear-sweep-and-cyclic-voltametry-the-principles
Such a difference are possible in case of zeolite - graphite paste modified electrode. Due to the high resistance during oxidation/reduction and change in co-ordination, it may be possible. Reversible, irreverisble and quasi reversible principles has to be little modified in such a case.
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