Bi2O2CO3 co-catalyst modification BiOBr driving efficient photoreduction CO2

Abstract

BiOBr (BOB) exhibits low photocatalytic CO 2 reduction performance due to its limited range of visible light response and insufficient separation efficiency of photogenerated carriers. In this work, the usage of Bi 2 O 2 CO 3 (BOC) as a co-catalyst and the formation of a heterojunction with BOB has significantly improved the separation efficiency of photogenerated carriers. From the transient photocurrent (TPR) and photoluminescence (PL) results, it is shown that when the mass fraction of BOC is 5 %, Bi 2 O 2 CO 3 /BiOBr (BOC/BOB) exhibits the fastest photogenerated carrier separation rate, approximately 5.75 times higher than that of pure BOB. The CO 2 reduction test results show that 5 % BOB/BOC exhibited the best photocatalytic CO 2 reduction performance of 14.6785 μmol·g −1 ·h −1 , which is 6.26 and 25.71 times higher than pure BOB and pure BOC, respectively. This work provides a new approach for the design and preparation of BOB-based composites.