I am doing photocatalytic H2 evolution. This is the first time I am facing this problem, the monochromatic light 365 and 420 nm wavelengths give me lower photocatalytic efficiency than the 450 and 475 nm wavelengths.
I think the following paper might be helpful.
Effect of wavelengths on photocatalytic oxidation mechanism of sulfadiazine and sulfamethoxazole in the presence of TiO2.
It is published in 2021 - Journal of Environmental Chemical Engineering
Dear Muhammad,
I hope you are successful in doing your research.
As you know, several factors are essential in photocatalytic systems, and light wavelength is one of the parameters that can affect the H2 evolution rate. I don't know the details of your work; however, if your results are repeatable and you can rationalize the results, it would be a great finding.
You might utilize Pt (or any other element) as a cocatalyst in your experiments which is a detrimental factor. The chemical environment of Pt atoms can significantly affect the performance of the system and the oxidation state of Pt atoms can also affect the photocatalytic efficiency. When you use different light energies, it might change the oxidation state of Pt atoms. Further, if you use a hole scavenger, it also might be affected by the light energy. So, you should make sure of the stability of the scavenger in UV-light irradiation.
I am not sure if I could be of any assistance; however, I am sure you can find a logical reason behind this finding.
Good luck.
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