Photocatalytic Reduction of Carbon Dioxide over Self‐Assembled Carbon Nitride and Layered Double Hydroxide: The Role of Carbon Dioxide Enrichment

Abstract A self‐assembly of carbon nitride (C 3 N 4 ) and layered double hydroxide (LDH) was constructed by electrostatic interaction. The pristine nitrate‐intercalated Mg‐Al‐LDH is turned to carbonate LDH through anion exchange during the photoreduction of CO 2 in aqueous solution. The carbonate anions enriched in the interlayer of LDH exhibit a remarkably high reduction efficiency to CH 4 in the presence of a C 3 N 4 photoabsorber and Pd cocatalyst.