Direct Z-Scheme WO3/Graphitic Carbon Nitride Nanocomposites for the Photoreduction of CO2

In this paper, we successfully prepared the WO3/g-C3N4 (WO/CN) heterojunction photocatalyst with high photocatalytic CO2 reduction performance by the simple impregnation-calcination process. Transmission Electron Microscope (TEM) analysis displays that the WO3 nano-particles (WO3 NPs) are successfully attached on the g-C3N4 nanosheets (CN). UV-Vis reflectance spectrum (UV-Vis DRS), Photoluminescence spectrum (PL) and Photoelectrochemical (PEC) results confirm that the building of WO/CN heterojunction is beneficial to the transfer and separate processes of the photogenerated carriers in the photocatalysts. The photoreduction performances of the obtained samples are texted by the photocatalytic CO2 reduction process under the UV and visible light irradiation. These experiments prove that the 10-WO/CN photocatalyst has the best photoreduction performance compared with other obtained photocatalysts. The yields of CO and CH4 in the presence of 10-WO/CN photocatalyst are 8.9 and 47.7 times larger than those of ...