AU Nanoparticles Modified In2o3/H1.5cn Z-Scheme Heterojunction for Photoreduction of Co2

The construction of Z-scheme heterojunction is of great significance for the photocatalytic reduction of CO2. Here, we prepared two-dimensional (2D) ultra-thin g-C3N4 by acidifying the carbon nitride precursor, and used In2O3 to construct a Z-scheme heterojunction with 2D g-C3N4, and finally In2O3/H1.5CN was modified with Au nanoparticles. The physicochemical properties of the prepared materials were studied by SEM/TEM, XPS, DRS, PL and photochemical test. At the same time, the Z-scheme charge transfer mechanism was proved by ESR. As a result, on the one hand, the localized surface plasmon resonance phenomenon caused by Au nanoparticles enhanced the visible light absorption capacity of the composite material. On the other hand, Au as the electron transfer bridge of the Z-scheme heterojunction accelerated the transfer of electrons on the CB of In2O3 to the VB of g-C3N4, avoided the recombination of electron-hole pairs, and retained the electrons with high reduction ability of g-C3N4. At the same time, 2D thin layer of g-C3N4 played a carrier effect to disperse In2O3 cube. Therefore, 2Au/In2O3/H1.5CN had stable CO2 reduction products, and the yields of CO and CH4 reached 141.24 and 77.05 μmol/g