Cross skeleton Prussian blue analogues and graphdiyne modified CdS to construct double S-scheme heterojunction for efficient photocatalytic hydrogen evolution

Abstract

The effective combination of organic and inorganic semiconductors and the construction of heterosomes to form new electron transfer channels can effectively enhance photocatalytic activity. The Co-Mn PBA with a unique cross-skeleton structure and the two-dimensional covalent organic material graphdiyne modified CdS, and successfully prepared double S-scheme heterojunction. The composites demonstrate reduced charge transfer resistance, improved electrochemically active area, and enhanced kinetics. CCM/G-2(858.54 μmol) has excellent photocatalytic hydrogen evolution performance, which is 5.7, 178.9 and 499.1 times that of CdS, CoMn PBA and GDY, respectively. The successful construction of a double S-scheme heterojunction provides a novel pathway for the migration of photogenerated carriers, facilitates the spatial separation of electrons and holes, modifies the barrier difference between semiconductors, enhances electron flow, and thereby achieves efficient hydrogen evolution. The composite catalyst exhibited exceptional photocatalytic performance and stability, offering valuable insights for the efficient conversion of solar energy into chemical energy.