Are the concept of valence band and conduction band applies for the dye based photocatalyst like semiconductor based material if it is then how?
It is defined as a substance which is activated by absorbing a photon and is capable of accelerating a reaction without being consumed.
Regarding the difference, the work of photocatalyst for hydrogen evolution reaction and oxygen evolution reaction depends on the band edges of the material which are dependent on the absolute electronegativity/work function and bandgap.
So if the material crosses this potential then whether it is a semiconductor or organic dye-based it will help in the photocatalytic activity.
Brajesh Rajesh Bhagat
Your answer: " It is defined as a substance which is activated by absorbing a photon and is capable of accelerating a reaction without being consumed"
is the direct plagiarism.
Compare: " A photocatalyst is defined as a substance which is activated by adsorbing a photon and is capable of accelerating a reaction without being consumed"
Fox M., Photocatalytic Oxidation of Organic Substances. In: Kluwer (ed.) Photocatalysis and Environment: Trends and Applications. New York Academic Publishers:
1988. p. 445–467
This is the IUPAC definition.
photocatalyst
https://doi.org/10.1351/goldbook.PT07446 Catalyst able to produce, upon absorption of light, chemical transformations of the reaction partners. The excited state of the photocatalyst repeatedly interacts with the reaction partners forming reaction intermediates and regenerates itself after each cycle of such interactions.Source: PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 384 [Terms] [Paper]
A photocatalytic water splitting system includes a photosensitizer, a charge separation unit (works in dark), and two dark catalytic systems evolving O2 and H2
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