Preparation Of Tunable CdTe-graphene Composites And Their Applications In Bionic Photocatalytic H₂ Production Systems

Hydrogen（H₂）is a kind of ideal clean energy.To establish an efficient and stable photocatalytic H₂production system has been one of the effective approaches for us to resolve the energy crisis and realize sustainable development.In view of the excellent properties of the composites combining semiconductor quantum dots（QDs）with graphene,in this thesis,we applied such kind of composites into the systems of photocatalytic H₂production and carried out the following work:（1）With the reduced graphene oxide（RGO）and CdTe QDs as the raw materials,a series of composites CdTe-（RGO）_n（n=0.5,1,2,4,7）were synthesized by a one-pot method.Then the composites were used to establish the effective photocatalytic H₂production systems.Comparative experiments were also carried out to study the effects of the ratio of RGO to CdTe QDs in the composite on the performance of photocatalytic H₂production.（2）A series of effective bionic photocatalytic H₂production systems were successfully established in aqueous solution using CdTe-RGO composites as the photosensitizers and a novel water-soluble hydrogenase model[Ni（bme-dach）Ni（dppe）Cl]（Cl）（1）as the catalyst,which exhibited good activity under weakly acidic condition.The efficiencies of the H₂generation in the photocatalytic systems corresponded to and were affected by the tunable sizes of the QDs in CdTe-RGO composites.（3）A series of bionic photocatalytic H₂production systems were established in acetonitrile aqueous solution using shape controlled CdTe-RGO composites as the photosensitizers and a novel hydrogenase model[（μ-SCH₂CH₂S-μ）Fe₂（CO）₅]₂Ni（bme-dach*）（2）as the catalyst.Under the same condition,the results of comparison experiments indicated that the H₂producing activities of the photocatalytic system driven by CdTe NRs（nanorods）were better than that driven by spherical CdTe QDs.