Hollow Bi4O5Br2 spheres enable high-density bismuth exposure for enhanced photocatalytic CO2-to-CO conversion

Abstract

Hollow Bi₄O₅Br₂ spheres, featuring high-density bismuth exposure, are developed to enhance light absorption, charge separation and CO₂ activation, thus resulting in efficient photocatalytic CO₂-to-CO conversion performance, including a CO production rate of 13.31 µmol g⁻¹ h⁻¹, a selectivity of 85.9%, and sustained stability over 25 hours.