Designing Heteroatom-Codoped Iron Metal-Organic Framework for Promotional Photoreduction of Carbon Dioxide to Ethylene

Rational engineering active sites and vantage defects of catalysts are promising but grand challenging task to enhance photoreduction CO2 to high value-added C2 products. In this study, we designed an N,S-codoped Fe-based MIL-88B catalyst with well-defined bipyramidal hexagonal prism morphology via a facile and effective process, which was synthesized by addition of appropriate 1,2-benzisothiazolin-3-one (BIT) and acetic acid to the reaction solution. Under simulated solar irradiation, the designed catalyst exhibits high C2H4 evolution yield of 17.7 mu mol g(-1)center dot h, which has been rarely achieved in photocatalytic CO2 reduction process. The synergistic effect of Fe-N coordinated sites and reasonable defects in the N,S-codoped photocatalyst can accelerate the migration of photogenerated carriers, resulting in high electron density, and this in turn helps to facilitate the formation and dimerization of C-C coupling intermediates for C2H4 effectively.

Automated summary

In this study, a N,S-doped Fe-based MIL-88B catalyst with a well-defined hexagonal prism morphology was designed and synthesized. The catalyst showed a high yield of C2H4 evolution under simulated solar irradiation, which was due to the synergistic effect of Fe-N coordinated sites and reasonable defects in the N,S-doped photocatalyst, facilitating the formation and dimerization of C-C coupling intermediates.