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CO 2 photocatalytic reduction is an excellent strategy for promoting solar-to-chemical energy conversion and alleviating the severe environmental crisis. In this study, 2D indium oxide (IO) is decorated on 2D bismuth oxybromide (BOB) nanosheets to gain BOB/IO (B x I y ) heterojunction. The optimal B 3 I 1 composite affords a CO production rate of 54.2 μmol⋅g -1 , about 2.2 times and 11.3 times higher than those of the pristine BOB and IO, respectively. The introduction of IO significantly enhances the internal electric field (IEF), leading to accelerated charge transfer and prolonged lifetime of the photogenerated carriers. In the B x I y composite, the BOB and IO serve as the electron acceptor and donor, respectively, facilitating the reduction of CO 2 and oxidation of H 2 O. In-situ DRIFTs spectra are used to confirm the catalytic active sites and provide insights into the mechanism of CO 2 photoreduction. The results suggest *COOH and *CO 2 - species played a crucial role in the formation of CO. This work presents a valuable perspective on understanding the charge transfer route and developing highly efficient photocatalysts for CO 2 photoreduction., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Inc. All rights reserved.)