FIELD: catalysts. SUBSTANCE: invention describes the novel ZnS-photocatalyst for producing hydrogen of the following formula: Pt(x)/Zn[M(y)]S where x means Pt content in this photocatalyst as mass percent in the range 0.05-2.50; M means a promoter that is an element taken among the group including V, Cr, Mo, Mn, Re, Ru, OS, Rh, Ir, Cu, Al and Ga; y means M/(M + Zn) as mole percent in the range 0.01-20.00. Invention describes also method of catalyst preparing and method of producing hydrogen using its. Catalyst exhibits optical activity at radiation in visible spectrum range. EFFECT: new photocatalyst indicated above, effective production of large amount of hydrogen. 11 cl, 1 tbl
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