Tuning the electronic structure of Ag3PO4-based composites through a graphene oxide mediator for enhanced photocatalytic activity†
Silver phosphate is a promising visible-light responsive photocatalyst. However, the serious photocorrosion limits its application in photocatalysis. Herein, a novel ternary graphene oxide (GO)-supported silver phosphate (APO)/cobalt ferrite (CFO) heterojunction composite was successfully synthesized via a simple ion-exchange deposition method for photocatalytic RhB degradation coupled with hydrogen generation from water-splitting under visible light irradiation. The results show that the photocatalytic degradation efficiency of the ternary APO-based composite is 2.37 times that of pure APO. Meanwhile, the photocatalytic H2 evolution reaction (HER) of the ternary APO-based catalyst was realized for the first time. This enhanced performance could be attributed to the fact that the charge recombination can be effectively suppressed and the photocorrosion effect of APO can be inhibited as the photogenerated electrons on the conduction band of APO can be injected into CFO through the GO mediator. Furthermore, the possible photocatalytic mechanism of the ternary APO-based catalyst was proposed to illustrate its excellent photocatalytic activity and stability. The present work sheds light on the design of multifunctional photocatalysts to simultaneously solve the problems of energy crisis and environmental pollution.