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.
Keywords: MoReS3; Schottky junction; heterostructure; photocarrier dynamics; photocatalytic CO2 conversion.
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