Engineering the direct Z‐scheme systems over lattice intergrown ofMOF‐on‐MOFfor selectiveCO2photoreduction toCO

Abstract The direct Z‐scheme provides a potential strategy for highly efficient CO 2 photoreduction, whereas the heterointerface contact resistance is significantly limited the interfacial electron transfer kinetic. Herein, we build the directional charge‐transfer channels in a direct Z‐scheme system over metal–organic frameworks (MOFs), that is, the lattice‐guided MOF‐on‐MOF hybrids, to facilitate CO 2 photoreduction. The heteroepitaxial lattice growth along the c ‐axis of MIL‐88B(Fe) via the high‐activity (001) facet over the stable (111) facet of UiO‐66‐NH 2 . Theoretical calculations and experimental results provide direct evidence that engineering direct Z‐scheme of these MOFs hybrids can induce the electrons migration from UiO‐66‐NH 2 to the holes of MIL‐88B(Fe) by directional charge‐transfer channels owing to their lattice match. This can dramatically boost photocatalytic CO 2 ‐to‐CO selectivity up to nearly 100%, with a rate of 2.26 μmol g −1 h −1 . This work demonstrates that the efficiently selective CO 2 photoreduction processes can be achieved by engineering Z‐scheme via lattice intergrown of MOF hybrids strategy.