Organic-inorganic hybridization strategy for promoting BiOBr CO2 photoreduction via enhanced CO2 adsorption and photogenerated carrier migration

Abstract

The low electron-hole separation efficiency and poor CO2 adsorption of BiOBr limit its photoreduction CO2 performance. In this work, BiOBr was hybridized with Ni-MOF, it shows that the Eads of BiOBr decreases from −0.36 eV to −1.73 eV, and the Gibbs free energy of CO2 adsorption decreases from 0.12 eV to −1.25 eV. In addition, the PL and TPR results reveal that the hybridization strategy accelerates the electron-hole separation rates. The CO evolution of BiOBr/Ni-MOF is 121.8 μmol g−1 h−1 when the amount of Ni-MOF is 15%, which is 5 and 7.2 times higher than BiOBr and Ni-MOF, respectively. Briefly, the CO2 adsorption and photogenerated carrier separation of inorganic materials can be improved by organic–inorganic hybridization strategy, which inspires a new direction for the design of high-performance catalysts.