CS bonds mediated rapid charge transfer in hm-C₄N₃/CdS heterostructure for efficient photocatalytic CO₂ reduction

The quest for stable and high-performance photocatalysts is pivotal in advancing the field of photocatalytic CO₂ reduction. Traditional single-component semiconductors are often impeded by their inability to concurrently achieve a broad light absorption spectrum, efficient separation of photogenerated charge carriers, and enduring stability, thereby constraining their photocatalytic efficacy. In this study, we introduce an innovative hm-C₄N₃/CdS heterojunction that broadens the light absorption spectrum and significantly enhances the separation efficiency of photogenerated charge carriers. Notably, this type-II heterojunction design effectively curbs the photocorrosion of CdS, and the CS bonds within the structure expedite electron transfer. Under irradiation, the photocatalyst exhibits a marked increase in activity and stability, yielding CO and CH₄ at rates of 67.5 μmol g^-1 h^-1 and 7.4 μmol g^-1 h^-1, respectively. This work provides valuable insights for promoting efficient and stable photocatalyst for CO₂ reduction.