▎ 摘　　要

The present research work focused on developing highly efficient visible light responsive photocatalyst for enhancement of hydrogen generation rate from water splitting. Effective heterostructure compositions were synthesized by the combination of Nb2O5-MoS2 (NM) with CdS/graphene and CuS/graphene (NM-CdS/G, NMCuS/G) by using hydrothermal method. The crystallite sizes of the synthesized composites were inferred from Xray diffraction (XRD) and found in the range 17-36 nm. The outcomes of scanning electron microscope (SEM) were confirmed the formation nano-structure by estimating particles sizes in the range 35-66 nm. This distinctive configuration exhibit enhanced light absorption, effectively develop the separation and transportation of photon-excited charge carriers and significantly raise photocatalytic hydrogen production rate. The energy band gap was reduced to 2.53 eV for NM-CdS/graphene composite. The prepared composite NM-CdS/graphene exhibited 100% degradation of MO in 180 min and the hydrogen generation rate was resulted about 8.7 mmol/h. The photo-generated electrons could efficiently migrate to the surface due to intimate interfacial contacts and synergism operating between NM and MS-Graphene (M = Cd, Cu) and the resulting improved separation potency of photo-induced electrons and holes inhibits the charge recombination rate and enhances photoactivity.