摘要
Surface modification by metal ion has been considered a promising strategy to enhance the photocatalytic activity by extending optical response and improving charge separation and transportation.Here,univalent copper species were modified on ZnIn_(2)S_(4)photocatalyst via an in-situ photodeposition method,exhibiting a much higher H2evolution rate of 41.10±3.43 mmol g^(-1)h^(-1)and an impressive apparent quantum efficiency(AQE)of 20.81%at 420±15 nm.Our characterizations indicate that the surface modification by copper species can broaden light utilization as well as promote charge separation and transportation.Besides,the density functional theory(DFT)results further exhibit that the energy levels(LUMO and HOMO)for copper-surface modified ZnIn_(2)S_(4)present spatial separation,locating on the Zn-S and In-S layers,respectively,which can suppress the recombination of electron and hole and thus achieves higher photocatalytic H2evolution efficiency.
基金
financially supported by the National Natural Science Funds for Distinguished Young Scholars(51725201)
the International(Regional)Cooperation and Exchange Projects of the National Natural Science Foundation of China(51920105003)
the Innovation Program of Shanghai Municipal Education Commission(E00014)
the Science and Technology Commission of Shanghai Municipality(21DZ1207101)
the National Natural Science Foundation of China(21902048)
the Shanghai Engineering Research Center of Hierarchical Nanomaterials(18DZ2252400)
Additional support was provided by the Feringa Nobel Prize Scientist Joint Research Center。
