Illumination source has mainly to create excitons in the catalyst, hence mainly depends on the region of its band gap energy (hv>= Eg). I want to confirm whether if the absorption regions of the dye and catalyst are in different regions (UV and Visible respectively) of solar spectrum, does it effects the catalytic activity if we use visible alone and UV-visible together?
Does selection of illumination source in that case affects the catalytic activity?
The optical band gap of the catalyst matters. So based on its band gap, the respective light source can be selected. Generally, the photo-generated electron-holes play an important in dye degradation. If the band gap of catalyst lies in the range of 3-3.5 eV, UV light source must be used and if the band gap is in the range of 1-1.6 eV, Visible light source can be used.
Thanks Dr. Lokhande. If however we use UV-Visible where we need only visible light source, would it affects the results?
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