0D/2D spatial structure CdxZn1-xS/Ni-MOF-74 for efficient photocatalytic hydrogen evolution
A novel zero-dimension/two-dimension CdxZn1-xS/Ni-MOF-74 (CZS/NMF) heterojunction was rationally constructed via simple hydrothermal and physical mixing method. The results shows that the composite of CZS/NMF-4 has best photocatalytic hydrogen evolution performance of 1712.3 μmol within 5 h, approximately 10 times higher compared with pure CZS. Such extraordinary enhanced photocatalytic hydrogen activity can be ascribe to the constitution of the direct Z-scheme heterojunction and the tiny size effect as well as the intimate contact between the 0D CdxZn1-xS nanoparticles and 2D Ni-MOF-74 sheets. The formation of direct Z-scheme heterojunction can effectively reduced the move resistance of light-generated carriers and dramatically promoted the separation rate of photo-induced electrons and holes. Meanwhile, the size effect shortened the electrons transfer distance which effectually decreased the recombination possibility of photo-induced electron-hole pairs. Furthermore, the 0D/2D space structure of CZS/NMF-4 extremely reduced the agglomeration of CZS nanoparticles, which provide more active sites for the process of hydrogen evolution. In general, this work provided a new inspiration for the application of the combine between progressive development new MOFs materials and tradition CdXZn1-XS photocatalyst according to the special spatial structure construction.