If current intensity is an additive property in voltammograms, then is the current intensity that is recorded at a potential greater than that of water oxidation a result of the oxidation of all species that oxidize at that potential? That is, if we have that water oxidation starts at 1.23 V and a species A is oxidized at 1.30 V, then the current measured at 1.30 V contains a contribution from water and species A?
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1.23 V is the standard potential for 4-electron water oxidation.
Dear Dr. Yurii V Geletii . I do not clearly understand your answer. But when I say that "current intensity is an additive property", I mean that the net current measured at a potential is the result of all the charge transfer processes that occur at that potential (see attached Figure). I will gladly learn all that is necessary, however the questions and answers on this site are for the exchange of knowledge. Best regards.
What voltammogram (CV, rde, etc) on your Figure? Water oxidation does not start at 1.23 V vers NHE
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Dear Dr. Yurii V Geletii, the 1.23 V value I wrote was to show some X value (whatever value it is, because it depends on the pH, reference electrode...) for solvent oxidation, my goal was to show that the process of interest is occurring in a zone where the water oxidation signal strongly masks the analyte signal. Actually the question was directed to a researcher who has worked on the oxidation or reduction of some species that the medium does not allow to study clearly, all this thinking about the possibility of deconvolution of signals as long as there is no coupled reaction, this for analytical purposes. Maybe I was not very clear in what I meant, but really my intention is to find someone who has experience in what I am explaining. Thank you very much for taking your time to participate in the discussion.
Fourier transformed alternating current voltammetry might be helpful. See an example
Lee CY, Guo SX, Murphy AF, McCormac T, Zhang J, Bond AM, Zhu G, Hill CL, Geletii YV. Detailed electrochemical studies of the tetraruthenium polyoxometalate water oxidation catalyst in acidic media: identification of an extended oxidation series using Fourier transformed alternating current voltammetry. Inorg Chem. 2012 Nov 5;51(21):11521-32. doi: 10.1021/ic301370y. Epub 2012 Oct 23. PMID: 23092201.
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