Solar-driven co-production of C₂H₄ and H₂O₂ from CO₂ and H₂O.

Abstract

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.