i run CV with scan limit -0.2V to 1.5V in electrolyte solution containing 0.1M anilne and 1M h2so4 only for one cycle. Obtained voltammogram attached here. what should be possible interpretation?
There are many papers(e.g. Electrochimica acta, 2005, 51(5): 984-990,Journal of electroanalytical chemistry and interfacial electrochemistry, 1988, 239(1-2): 387-396. ) in previous reports on CV of anilne in electrolyte solution containing 0.1M anilne and 1M H2SO4, your CV is different with CV in previous reports.CV of anilne is very complicated in comparsion with thiophene and pyrrole,factor like potential, pH affected electrochemistry of anilne.
There are many papers(e.g. Electrochimica acta, 2005, 51(5): 984-990,Journal of electroanalytical chemistry and interfacial electrochemistry, 1988, 239(1-2): 387-396. ) in previous reports on CV of anilne in electrolyte solution containing 0.1M anilne and 1M H2SO4, your CV is different with CV in previous reports.CV of anilne is very complicated in comparsion with thiophene and pyrrole,factor like potential, pH affected electrochemistry of anilne.
Getting a conclusion on one CV curve with one speed and such high concentration of aniline is impossible in my point of view.
Appears to be the first cycle of the electrochemical polymerisation of aniline. The "nucleation loop" (higher currents in the high-potential region of the cathodic half-cycle than in the corresponding region of the anodic half-cycle) is a typical symptom of the deposition of a conductive film on the working electrode. That said, You might want to limit the applied potential quite a bit (unable to give You an exact value, since the reference electrode is unknown) - possibly by even 0.6V, in order to avoid over-oxidising the incipient polymer film.
For reference, You might want to use the following paper by Lapkowski et al., as well as some other works by the author (there is also a rather good review on polyaniline available).
https://doi.org/10.1016/0379-6779(90)90041-I
Still I am insisting that a single aniline CV with such speed , concentration ,missing reference electrode and other details is useless to give an interpretation.Moreover a rich literature exists on the oxidation of aniline with its several polymerization routes through various mechanisms I am interested to know the working and reference electrodes and to see repetitive CV curves with a concentration in the range of 10-4 and concentrations of H2SO4 less that 10-1 M to get a general idea .
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