Efficient interfacial charge transfer of CeO2/Bi19Br3S27 S-scheme heterojunction for boosted photocatalytic CO2 reduction

Improving the separation efficiency of photogenerated charge carriers to significantly enhance the redox capability of photocatalysts remains a major challenge in the field of photocatalysis. To address this issue, this study successfully synthesized a CeO 2 /Bi 19 Br 3 S 27 S-scheme heterojunction catalyst using a hydrothermal method, aiming to enhance the photocatalytic performance of the catalyst. The synthesis of the CeO 2 /Bi 19 Br 3 S 27 composite not only improved the separation efficiency of photogenerated charge carriers but also endowed the catalyst with stronger redox capabilities and greater driving force, significantly boosting its photocatalytic performance. Experimental results showed that the CO production rate of the CeO 2 /Bi 19 Br 3 S 27 composite catalyst reached 13.5 ​μmol ​g −1 ​h −1 , which is 5.19 times higher than that of the pure Bi 19 Br 3 S 27 catalyst and 2.81 times higher than that of the pure CeO 2 catalyst. This significant enhancement indicates that the CeO 2 /Bi 19 Br 3 S 27 composite catalyst exhibited stronger catalytic performance in CO generation reactions. Furthermore, CeO 2 /Bi 19 Br 3 S 27 catalyst achieved a CH 4 production rate of 4.3 ​μmol ​g −1 ​h −1 , which is 3.1 times higher than that of the CeO 2 catalyst and 2.7 times higher than that of the Bi19Br3S27 catalyst, further confirming its superior performance in CH 4 generation reactions. These results demonstrate that the CeO 2 /Bi 19 Br 3 S 27 composite catalyst not only shows significant improvements in CO and CH 4 production rates but also exhibits excellent photocatalytic performance, highlighting its potential application in the field of photocatalysis. This study provides new insights into improving the separation efficiency of photogenerated charges and offers valuable references for the future development of highly efficient photocatalytic materials. By constructing the S-scheme heterojunction structure, the recombination of photogenerated charge carriers can be effectively suppressed, thereby enhancing the efficiency of photocatalytic reactions and providing a new solution for sustainable energy utilization. Design of an S-scheme Heterojunction Composed of CeO 2 and Bi 19 Br 3 S 27 . The optimized CeO 2 /Bi 19 Br 3 S 27 composites achieved high photocatalytic performance.