Cr-MOF composited with facet-engineered bimetallic alloys for inducing photocatalytic conversion of CO₂ to C₂H₄

Abstract

The design of efficient photocatalysts is crucial for photocatalytic CO₂ reduction. This study developed photocatalysts based on MIL-101(Cr) composited with a facet-engineered Pt/Pd nanoalloy (PPNA). Photocatalytic performance evaluations show that MIL-101(Cr) loaded with PPNA exposing {111} facets, namely M-A(111), exhibits a CO₂ to C₂H₄ conversion rate of 9.5 μmol g^-1 h^-1 in addition to the CO and CH₄, whereas M-A(100) with PPNA exposing {100} facets gives CO₂ conversion rates of 33.2 for CO and 9.3 μmol g^-1 h^-1 for CH₄ without C₂H₄. <i>In situ</i> FT-IR revealed that M-A(111) can readily form C₂ intermediates during the reaction. This work offers a strategy for the design of photocatalysts for CO₂ reduction to C₂H₄.