Tóm tắt

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