In situ irradiated XPS proved efficient charge transfer on graphdiyne (CnH2n-2) based tandem NiFe PBA/CuI/GD S-scheme heterostructure for photocatalytic hydrogen production

Due to its abundant carbon chemical bonds, large conjugated system and natural pore structure, graphdiyne (GD, CnH2n-2) shows great advantages in growth, assembly and performance regulation, and is a key material to promote innovative development in catalysis, energy and other fields. In this study, NiFe PBA cube was prepared by coprecipitate method, and then NiFe PBA/CuI/GD ternary composite photocatalyst was formed by tightly coating NiFe PBA and CuI with graphitylene material. In situ irradiated X-ray photoelectron spectroscopy characterizes the change in electron cloud density of a catalyst under illumination, so as to determine the series-type transfer path of photogenerated electrons between three single photocatalysts, thus revealing the formation of double S-scheme heterojunction. Photocurrent and fluorescence tests have confirmed that the photogenerated carriers in NiFe PBA/CuI/GD can be transferred rapidly and utilized efficiently to participate in the photo-catalytic reaction under the action of strong interfacial electric field. In addition, the three-dimensional structure of NiFe PBA and CuI and the surface carbon layer synergistic effect to expand the utilization rate of visible light catalyst. This work provides a new idea for the construction of S-scheme heterojunction and the application of new carbon materials in the field of photocatalysis.

Automated summary

Due to its abundant carbon chemical bonds, large conjugated system and natural pore structure, graphdiyne (GD, CnH2n-2) shows great advantages in growth, assembly and performance regulation, and is a key material to promote innovative development in catalysis, energy and other fields.