Solar-driven conversion CO2 and H2O into valuable C2H4 and H2O2 chemicals holds immense potential for mitigating CO2 levels and maximize the economic feasibility. Nevertheless, based on the accessible *OH overoxidation and recombination process of *H-*OH in gas-solid reaction system, the concept that efficient synthesis of C2H4 and H2O2 has not been simultaneously realized in photoconversion of low-cost CO2 and H2O. To substantiate the importance of limiting *OH overoxidation as well as mitigating *H-*OH recombination, we have developed a spatially confined Cu/AgBr/TiO2 ternary hybrid architecture. This precise spatial confinement structure not only proves the influence of restrained *OH overoxidation and *H-*OH recombination on Cu sites for selective hydrocarbon production, but also highlights the role of *OH in promoting *CO coupling during CO2 photoreduction and provide the high-concentration *OH coverage for H2O2 production in gas-solid phase reaction. Here, the findings contribute to reveal the selectively catalytic mechanisms by associating with specific insights of H2O evolution behavior for efficient and selective CO2 conversion to C2H4 and H2O2. This research developed a spatially confined Cu/AgBr/TiO2 photocatalyst that enables light-driven conversion of CO2 and H2O into C2H4 and H2O2 by stabilizing *OH intermediates and promoting C-C coupling.
Xie et al. (Mon,) studied this question.