Abstract
CO2 cycloaddition is an effective way to realize carbon neutralization. It is a great challenge to develop efficient and green catalytic system. In this work, ZnIn2S4 catalyst with highly exposed surface zinc sites were fabricated for thermal & bule LED driven solvent-free CO2 cycloaddition. The optimized ZISe shows efficient yield of CO2 cycloaddition with epoxides under blue LED irradiation at 80 °C with TBAB as cocatalyst (Con 92.3%; Sel >99; 137.1 mmol/g/h). Excellent stability and broad substrates scoped was confirmed. The photoinduced hole facilitates the coordination and polarization of adsorbed propylene oxide. Simultaneously, photoinduced electron would transfer to propylene oxide molecule to form electron-riched transition state, which was not only facilitate to the open-ring step of propylene oxide, but also greatly help the activation of CO2 adsorbed adjacent S2- sites. To our knowledge, this is the first report on thermo-photo-synergistic catalytic CO2 cycloaddition on ZnIn2S4.
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