Cu 2 O-CuX NPs rich in oxygen vacancies modulated by halogen ions and their application in photocatalytic degradation

O-CuX NPs exhibit higher content of OVs, narrower band gaps, and significantly improved photocurrent signal. These findings suggest that the introduction of halogen ions promotes the efficiency of light collection and charge carrier separation and thus improves the degradation of MB. This work may open up new avenues for the design of superior photocatalysts for dealing with organic contaminants through engineering of OVs.