Abstract: The present invention relates to a novel CdS photocatalyst for producing hydrogen from water by photoreaction and preparation therefor, and method for producing hydrogen by using of the CdS photocatalyst. The CdS photocatalyst is characterized by the following general formula V: m(A)/Cd[M(B)]S  V wherein m represents a doped metal element as an electron acceptor, such as Pt, Ru, Ir, Co, Rh, Cu, Pd, Ni, or the oxidized compound of one of these metals; A represents a percentage by weight of m, ranging from 0.10 to 2.50; M is catalyst element, e.g. V, Cr, Al and P; and B represents a mole % of M(M+Cd), ranging from 0.05 to 20.00.

Abstract: The present invention relates to a novel photocatalyst, to preparing the photocatalyst and to a method for producing hydrogen in the presence of the photocatalyst. The novel photocatalyst of this present invention is characterized by the following formula IV: Pt(x)/Zn[M(y)]S  IV wherein “x” represents a percentage by weight of Pt in the photocatalyst ranging from 0.05 to 2.50; “M” is a promoter selected from the group consisting of V, Cr, Mo, Mn, Re, Ru, Os, Rh, Ir, Cu, Al and Ga; and “y” represents a mole % of M/(M+Zn) ranging from 0.01 to 20.00. The method for preparing the photocatalyst comprises the steps of dissolving Zn-containing and M-containing compounds in water in such a way that M/(M+Zn) ranges, in mole %, from 0.01 to 20.

Abstract: A photocatalyst, represented by Formula IIPt(a)/Zn[M(b)]S IIwherein character "a" represents a percentage by weight of Pt in the photocatalyst, ranging from 0.1 to 3.5; character "M" is an element selected from the group consisting of Co, Fe, Ni and P; character "b" represents a mole % of M/Zn, ranging from 0.05 to 30. It can be active in the range of the visible light, live a semi-permanent life and produce hydrogen at a high yield without using any oxygen-containing organic compound as a hydrogen-producing promotor.