57 / 2019-10-13 19:31:22

A LEAF-BRANCH TIO2/CARBON@MOF COMPOSITE FOR SELECTIVE CO2 PHOTOREDUCTION

Metal-organic frameworks,,Photocatalysis,TiO2 fibers,Z-scheme

Due to a large number of possible products, a significant challenge in CO2 photoreduction is achieving selectivity to a single product while maintaining high conversion efficiency. Herein, a well-integrated photocatalyst is fabricated through growing leaf-like zeolitic imidazolate frameworks (ZIF-L) on branch-like titanium dioxide/carbon (TiO2/C) nanofiber for selective CO2 reduction. This platform enables the study of the synergistic effect of the photocatalytic performance, where the strong CO2 adsorption/activation, highly efficient light-harvesting, promoted electron-hole pairs separation, specific metal Lewis sites are achieved by integrating suitable band matched ZIF and TiO2, as well as interfaced graphitic carbon. As a result, a largely increased CO generation rate of 28.6 μmol h−1 g−1 with remarkable selectivity of 99% is achieved in the TiO2/C@ZnCo-ZIF-L without using sacrificial reagent. This work thus provides an insight into the rational construction of well-integrated composites to enhance photocatalytic performance via a well-balanced synergistic effect.