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

Abstract

AbstractThe direct Z‐scheme provides a potential strategy for highly efficient CO2photoreduction, 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 CO2photoreduction. The heteroepitaxial lattice growth along thec‐axis of MIL‐88B(Fe) via the high‐activity (001) facet over the stable (111) facet of UiO‐66‐NH2. 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‐NH2to the holes of MIL‐88B(Fe) by directional charge‐transfer channels owing to their lattice match. This can dramatically boost photocatalytic CO2‐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 CO2photoreduction processes can be achieved by engineering Z‐scheme via lattice intergrown of MOF hybrids strategy.