In my experience doing cyclic voltammetry glassy carbon (GC) can be used up to 1.8-2.0 V vs. Ag/AgCl in MeCN water mixtures, without visible degradation of the electrodes. For graphite electrodes I have observed much larger currents and visible degradation at much lower potentials (1.2-1.4 V). My question is if this lower stability is due to many oxidisable groups in the graphite, and thus the performance could be improved by curing it for long times at a relatively high temperature? Or is it some kind of electrochemical exfoliation of graphene or something similar. In the latter case is it a matter of density of the material? Can the performance be improved by making a hard graphite-epoxy composite? Or some other type of composite? I'm looking to obtain graphite based electrodes with the largest possible oxidation electrochemical window. Any insights are greatly welcome?
Thank you for your answer. As far as I know GC is not fully graphitized, at least the one used in commercial electrodes. But beyond that I don't know the exact structure. I also know that there are many different densities of graphite, but I haven't been able to try many different ones.
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