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Dear prof. Geletii. Thank you for you answer. Maybe my question is not clear. I yet studied the photocatalytic water splitting. The sacrifical agent (eg. Methanol) and a a co-catalyst as Pt was used together with a photocatyst (typically TiO2 or Pt/TiO2) to avoid the electron-hole recombination and  increasing the rate of h2 production. I would understand or check if there are some examples in literature, if it possible with Gc or volumetric method measure the small amount of hydrogen produced without sacrifcal agent using only the photocatalyst and water 

Water splitting means the formation of both H2 and O2. In this case water can be formally considered as a sacrificial agent. Therefore to produce H2 you must oxidize water to O2. In other words for water splitting you need  a photosensitizer, a charge separation system, water reduction and water oxidation catalysts. All these subunits must work together. How to achieve water splitting is discussed in numerous papers. Google will help you. 

Thank you very much Anil, you have understand perfectly my question.

Kindly find the attached article for the same.

https://www.sciencedirect.com/science/article/pii/S0016236118302308