Synergistic enhancement of photocatalytic hydrogen peroxide production activity in CN/rBOB composite through double field effect

Abstract

Herein, a novel rod-like bismuth bromide oxide (rBOB) was prepared by using a Bi delayed-release strategy and H capping competition effect. And rBOB was combined with graphite carbon nitride (CN) to construct S-scheme heterojunction material (CN/rBOB). This work focused on the regulation mechanism of the rod-like morphology of rBOB and the photocatalytic HO production (PHP) performance of CN/rBOB under the action of an external magnetic field. The results showed that the magnetic field can significantly increase the photocurrent response and intrinsic carrier concentration of the catalyst. And the magnetic field action improved the PHP of CN/rBOB from 1.81 to 3.31 mmol·g·h. This "internal electric field-external magnetic field" synergistic tuning obviously improves the efficiency of photogenerated carrier separation and transport to the surface active sites, which is a simple and useful strategy to construct high-quality photocatalytic systems.