Solar-driven CO2 conversion promoted by MOF − on − MOF homophase junction

We herein reported the first case of successfully synthesizing homologous Ti(IV) − based metal−organic frameworks (MOFs) junction, comprising NH2-MIL-125 core and NTU-9 layer, via a MOF-on-MOF strategy. Benefiting from the core-shell structural advantages and the homophase type II junction effect, the obtained NH2[email protected] hybrids exhibit accelerated reaction kinetics and enhanced electron transfer behaviour in the solar-driven CO2 reduction. The quantum efficiency of formate production at 430 nm (0.67%) and product selectivity (94.47%) over NH2[email protected] far surpass those of the pure NH2-MIL-125 (0.13%, 88.56%) and NTU-9 (0.16%, 89.26%), which is among the highest performances of MOFs reported previously.