Sacrificing ionic liquid-assisted anchoring of carbonized polymer dots on perovskite-like PbBiO2Br for robust CO2 photoreduction

Abstract The semiconductor-mediated solar-driven the conversion of CO 2 into the value-added fuels is considered as an ideal strategy for sustainable development. However, conventional semiconductors usually suffer from unsatisfactory photocatalytic performance due to the low efficiency of photo-induced carrier separation and sluggish interface adsorption/desorption equilibrium of reactants/products. Herein, novel carbonized polymer dots (CPDs)/PbBiO 2 Br heterojunction photocatalysts have been prepared via self-sacrificing ionic liquid, which not only act as the template and reactant to induce the formation of PbBiO 2 Br material, but also act as the glue to in situ anchor CPDs on the surface of PbBiO 2 Br material to form composites through hydrogen bond. Without sacrificial reagent, the obtained CPDs/PbBiO 2 Br materials synthesized with ionic liquid exhibit a high selectivity, stability and enhanced CO evolution rate in water. The introduction of CPDs not only effectively promote the light absorbance and separation efficiency of photogenerated electrons, but also adjust the adsorption/desorption equilibria of reactants/products on the CPDs/PbBiO 2 Br catalyst surface, such as boosting CO 2 adsorption capacity, proton affinity and CO liberation. The reaction mechanism has been proposed with in situ FT-IR spectrometry. The strategy for the preparation of high-performance CO 2 photoreduction catalysts can be extended to design and tune other advanced photocatalytic materials.