Cyclic voltammogram of material with 3 electrode system (Ag/AgCl reference, Pt working electrode and Pt wire as the counter electrode) in 0.1 M Tetra -n butylammonium tetrafluoroborate in acetonitrile as the electrolyte is given below. The oxidation peak is found to be at 0.99 V. Can the crossover point at -0.5 V be considered as the reduction peak? Please share any references to interpret this data.
Dear Rosemary Davis
"Can the crossover point at -0.5 V be considered as the reduction peak?"--I don't think it is a reduction peak of your salt in the electrolyte. It is Hydrogen evolution on Pt surface.
You can get a better idea of HOMO and LUMO values of the following links:
https://www.researchgate.net/post/How_can_I_calculate_the_HOMO_LUMO_energy_from_Cyclic_Voltammetry_data
https://www.researchgate.net/post/Does_anyone_know_how_to_measure_LUMO-HOMO_from_CV
Best Regards,
Bapi
Thank you Bapi Bera , as there is no reduction peaks are seen in the present voltammogram, which will be the reduction potential? Should I consider only the oxidation peak and with the help of band gap calculated from absorption spectroscopy, find the LUMO value?
Use UV spectroscopy to calculate the energy gap (Tauc plot). From CV you can find HOMO only (onset of oxidation potential). Which concentration of organic material do you use?I think you MeCN has a impurities.What is the size of your working electrode?
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