Construction of multi-dimensional Cu2Se@amorphous carbon@graphene nanobelt/g-C3N4 Z-scheme heterojunctions for photocatalytic hydrogen production

Herein, the Cu2Se@Amorphous Carbon@Graphene Nanobelt/g-C3N4 (Cu2Se@C@GN/g-CN) nanocomposite is successfully synthesized by constructing a spatial graphene cross network with the strategy of "Winding + Adsorption" to form an effective orientated directed transmission band of electrons channel between the three-dimentional Cu2Se and two-dimensional g-CN. Such unique structure of Cu2Se@C@GN/g-CN can realize the effective grasp of the two-dimensional g-CN sheet and the three-dimensional Cu2Se@C through multi-path connection to guarantee the photogenerated electron in 2D g-CN can directly transport to the 3D Cu2Se along the inter-connected spatial cross 1D graphene nanobelt network to make sure the immediately reduction of H+ to hydrogen. The Z-Scheme charge transfer mechanism contributes to the spatial separation of charges and maintains the strongest redox potential. Notably, the photocatalytic hydrogen evolution rate of Cu2Se@C@GN/g-CN can reach up to 127.3 μmol g−1 h−1, which is higher than Pt(2%)/g-CN (111.6 μmol g−1 h−1) and is even approximately 106 times higher than the g-CN (1.2 μmol g−1 h−1).