Reinforcing 2D Single-Crystal BiOCO with Additional Interlayer Carbonates by CO-Assisted Solid-to-Solid Phase Transition.

A facile gaseous CO mediated solid-to-solid transformation principle is adopted to insert additional CO anions into the thin single-crystal nanosheets of BiOCO, which is built of periodic arrays of intrinsic CO anions and (BiO) layers. The additional CO anions create abundant defects. The BiOCO nanosheets with rich interlayer CO exhibit superior electronic properties and charge transfer kinetics than the pristine single-crystal 2D BiOCO and display enhanced catalytic activity in photocatalytic CO reduction reaction and the photocatalytic oxidative degradation of organic pollutants.