Direct Z-Scheme Heterojunction of SnS₂/Sulfur-Bridged Covalent Triazine Frameworks for Visible-Light-Driven CO₂ Photoreduction

Solar-driven reduction of CO₂ into renewable carbon forms is considered as an alternative approach to address global warming and the energy crisis but suffers from low efficiency of the photocatalysts. Herein, a direct Z-Scheme SnS₂/sulfur-bridged covalent triazine frameworks (S-CTFs) photocatalyst (denoted as SnS₂/S-CTFs) was developed, which could efficiently adsorb CO₂ owing to the CO₂-philic feature of S-CTFs and promote separation of photoinduced electron–hole pairs. Under visible-light irradiation, SnS₂/S-CTFs exhibited excellent performance for CO₂ photoreduction, yielding CO and CH₄ with evolution rates of 123.6 and 43.4 μmol g⁻¹ h⁻¹, respectively, much better than the most catalysts reported to date. This inorganic/organic hybrid with direct Z-Scheme structure for visible-light-driven CO₂ photoreduction provides new insights for designing photocatalysts with high efficiency for solar-to-fuel conversion.