Regulating Photocarrier Dynamics via Constructing 1D CdS/2D Semi‐Metallic MoReS₃ Schottky Junction Boosts Solar‐Driven CO₂ Conversion

Heterostructure strategy is promising to overcome the dynamic bottleneck for fast photocarrier recombination competing with sluggish surface redox in photocatalytic CO₂ conversion but remains limitations for sacrificing stronger redox ability. The emerging Schottky junction is expected to conquer these problems, but dynamics mechanism remains unclear. Herein, 2D semi-metallic MoReS₃ with Janus structure is adopted to in situ construct 1D/2D heterostructure on CdS nanowires. Beneficial from a matchable work function, band structure, and sufficient interfacial electronic coupling, the interfacial electric field (IEF) directing from CdS to MoReS₃ is successfully formed at 1D/2D heterointerface to construct the Schottky junction. In-depth dynamics analysis demonstrates that IEF facilitates photoinduced excitons dissociating in CdS and drives photoholes to migrate into MoReS₃, while the Schottky barrier prohibits the photoelectron transfer to MoReS₃, inducing efficient photocarrier space separation. Superior catalytic activity of MoReS₃ further accelerates photohole consumption kinetics and successfully elongates the lifetime of photoelectrons at CB of CdS with a higher reduction ability to drive CO₂ conversion, synergistically resulting in sharply enhanced photocatalytic CO₂ conversion performance (CO production rate over 7-times of CdS) with high selectivity (96.4%). This work deeply unravels the advantages and mechanism of Schottky junction to photocarrier dynamics regulation in the photocatalysis field.