Affiliation:
1. Shanghai Key Laboratory of Chemical Assessment and Sustain ability School of Chemical Science and Engineering Tongji University 1239 Siping Rd. Shanghai 200092 China
Abstract
AbstractPhotocatalytic CO2 reduction to high‐value‐added C2+ products presents significant challenges, which is attributed to the slow kinetics of multi‐e− CO2 photoreduction and the high thermodynamic barrier for C–C coupling. Incorporating redox‐active Co2+/Ni2+ cations into lead halide photocatalysts has high potentials to improve carrier transport and introduce charge polarized bimetallic sites, addressing the kinetic and thermodynamic issues, respectively. In this study, a coordination‐driven synthetic strategy is developed to introduce 3d transition metals into the interlamellar region of layered organolead iodides with atomic precision. The resultant bimetallic halide hybrids exhibit selective photoreduction of CO2 to C2H5OH using H2O vapor at the evolution rates of 24.9–31.4 µmol g−1 h−1 and high selectivity of 89.5–93.6%, while pristine layered lead iodide yields only C1 products. Band structure calculations and photoluminescence studies indicate that the interlayer Co2+/Ni2+ species greatly contribute to the frontier orbitals and enhance exciton dissociation into free carriers, facilitating carrier transport between adjacent lead iodide layers. In addition, Bader charge distribution calculations and in situ experimental spectroscopic studies reveal that the asymmetric Ni–O–Pb bimetallic catalytic sites exhibit intrinsic charge polarization, promoting C–C coupling and leading to the formation of the key *OC–CHO intermediate.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shanghai Municipality
Cited by
4 articles.
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