Mn0.2Cd0.8S modified with 3D flower-shaped Co3(PO4)2 for efficient photocatalytic hydrogen production

PO43- ions have good conductivity and can provide open channels for rapid ion migration. In contrast, the solid solution Mn0.2Cd0.8S catalyst has been limited for a long time due to its low charge separation efficiency and its tendency to lead to rapid electrons and holes binding. Therefore, on the basis of in-depth study catalysts of Co-3(PO4)(2) and Mn0.2Cd0.8S, we successfully synthesized flake-shaped stacked nano-flower shaped Co-3(PO4)(2) and rod-shaped Mn0.2Cd0.8S. In addition, combined with traditional physical heating and stirring method, Mn0.2Cd0.8S was inserted into the petals of Co-3(PO4)(2), forming a heterojunction between their contact surfaces to promote photocatalytic hydrogen production. The study found that when the amount of Co-3(PO4)(2) was 10%, the hydrogen reduction efficiency of the composite catalyst reached was the best, reaching 0.57 mmol (11.4 mmol/h/g) within 5 hours, which was three times that of the single catalyst Mn0.2Cd0.8S. The results show that the formation of heterojunction provides an open channel for rapid charge transfer and reduces the consumption of photo generate carriers. Moreover, the flake-like accumulation of Co-3(PO4)(2) provided a 3D reaction space for Mn0.2Cd0.8S, and increased the reaction active sites omaf, the composite catalyst. Therefore, more effective photo-generated carriers migrate to the surface of Co-3(PO4)(2) and then participate in the photocatalytic evolution reaction of hydrogen. This study provides a new idea for improving the photocatalytic hydrogen production performance of Mn0.2Cd0.8S catalyst.

Automated summary

The study successfully synthesized flake-shaped stacked nano-flower shaped Co-3(PO4)(2) and rod-shaped Mn0.2Cd0.8S, forming a heterojunction between them to improve the photocatalytic hydrogen production efficiency.