Switching Excited State Distribution of Metal-Organic Framework for Dramatically Boosting Photocatalysis.

Photosensitization associated with electron/energy transfer represents the central science of natural photosynthesis. Herein, we proposed a protocol to dramatically improve the sensitizing ability of metal-organic frameworks (MOFs) by switching their excited state distribution from MLCT (metal-to-ligand charge transfer) to IL (intraligand). The hierarchical organization of IL MOFs and Co/Cu catalysts facilitates electron transfer for efficient photocatalytic H evolution with a yield of 26 844.6 μmol g and CO photoreduction with a record HCOOH yield of 4807.6 μmol g among all the MOF photocatalysts. Systematic investigations demonstrate that strong visible-light-absorption, long-lived excited state and ingenious multi-component synergy in the IL MOFs can facilitate both interface and intra-framework electron transfer to boost photocatalysis. This work opens up an avenue to boost solar-energy conversion by engineering sensitizing centers at a molecular level.