An efficient Z-type CeO2/BiOBr heterostructure with enhanced photo-oxidation degradation of o-DCB and CO2 reduction ability

The Z-type CeO2/BiOBr heterostructures were skilfully designed by assembling CeO2 nanoparticles onto the surface of BiOBr microflowers. This composite photocatalyst demonstrates efficient photo-oxidation degradation ability for o-DCB and CO2 reduction ability. Through analyses of its morphology, microstructure, XPS spectra, low-temperature ESR, SPV, and charge transfer dynamics (TPV and TR-PL), the paper elucidates the superior performance of the CeO2/BiOBr composite and discusses its photocatalytic mechanism. The enhanced photo-oxidation degradation ability and CO2 reduction performance of the heterostructure, compared to the individual CeO2 and BiOBr components, indicate that this Z-scheme microstructure effectively promotes the recombination of photogenerated holes the valence band (VB) of the BiOBr with the electrons in the conduction band (CB) of the CeO2, leading to the abundant carriers surviving in the corresponding energy bands. This study provides valuable insights into the rational design of Z-type heterostructures for advanced photocatalytic applications.