Porphyrin‐based Bi‐MOFs with Enriched Surface Bi Active Sites for Boosting Photocatalytic CO<sub>2</sub> Reduction
Mingjie Cheng, Pengfei Yan, Xiaoli Zheng, Bo Gao, Xinying Yan, Gaoxiang Zhang, Xiaomin Cui, Qun Xu
Abstract
Abstract The inherent challenges in using metal‐organic frameworks (MOFs) for photocatalytic CO 2 reduction are the combination of wide‐range light harvesting, efficient charge separation and transfer as well as highly exposed catalytic active sites for CO 2 activation and reduction. We present here a promising solution to satisfy these requirements together by modulating the crystal facet and surface atomic structure of a porphyrin‐based bismuth‐MOF (Bi‐PMOF). The series of structural and photo‐electronic characterizations together with photocatalytic CO 2 reduction experiment collectively establish that the enriched Bi active sites on the (010) surface prefer to promote efficient charge separation and transfer as well as the activation and reduction of CO 2 . Specifically, the Bi‐PMOFs‐120‐F with enriched surface Bi active sites exhibits optimal photocatalytic CO 2 reduction performance to CO (28.61 μmol h −1 g −1 ) and CH 4 (8.81 μmol h −1 g −1 ). This work provides new insights to synthesize highly efficient main group p ‐block metal Bi‐MOF photocatalysts for CO 2 reduction through a facet‐regulation strategy and sheds light on the surface structure‐activity relationships of the MOFs.