I know that during oxidation & reduction Co oxidation state changes +2 to +3 to +4 vice versa. Explain why one peak in one case and why more peaks in other case even if material is same i.e Co3O4?
There are a few possible reasons:
1. Though the material has the same elemental composition, it contains several different crystalline phases, or differing amounts of different faces of the major crystalline phase (i.e. more edges). Different phases and faces, are known to have different reactivity and these are likely to manifest as different potentials and thus, new peaks.
2. Are you varying any other parameter? Solvent, scan rate, solvent purification method, presence or absence of water or oxygen, supporting electrolyte? Changing any of these can affect the ease of reactions (overpotentials again) which can lead to resolution of one peak into many (as with quinones), or can cause new reactions to occur, resulting in new peaks.
CV is very sensitive to small changes, make sure you do everything EXACTLY the same way each time and you will likely remove that variability.
Thank you Jason Mann I agree with first point, I checked with same experimental conditions only.
I have seen many papers no one described about this i also checked with many compounds with same composition (Co3O4). I did not observe same CV profile in all cases even eperimental conditions are same in all cases ,if you or anyone know(s) any reference please suggest me.
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