I am trying to calculate energy level of HOMO and LUMO for synthesized material by Cyclic Voltammetry . But, the problem is that; the energy band gap calculated for HOMO and LUMO is higher than the band gap of same material calculated by UV/Vis spectroscopy using tauc plot. I have used three electrode system; WE glassy carbon, reference electrode Ag/AgCl , counter electrode Pt wire. I have performed the experiment for three time.
What reason can be behind this difference??
Is binder effecting the properties of material?? then how can be cyclic vlotammetry performed of a powder without binder??
Dear Muhammad,
Please see the attached published paper which explain well how to determine the HOMO and LUMO energy levels using different techniques including CV measurements. It also gives more details how to correct the errors between different techniques.
Hope it helps.
Best wishes
Xuhua
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