Efficient CO2 Photoreduction into Solar Fuels over MoO3-x/COF S-Scheme Photocatalyst

doi:10.1007/s40242-025-5033-9

Abstract

Abstract: The restricted electron transport and slow surface reaction kinetics are two fundamental limitations affecting the photocatalytic efficiency of covalent organic frameworks (COFs). To address these challenges and enhance charge separation, this study utilizes an in-situ growth strategy to incorporate MoO_3-x into COF (denoted as BTTA), forming MoO_3-x/COF composites (MOCOF). These composites demonstrate significantly enhanced solar fuel performance through photocatalytic CO₂ reduction. In-situ irradiated X-ray photoelectron spectroscopy and electron spin resonance analyses confirm the presence of an S-scheme carrier transfer mechanism, which effectively spatially separates photogenerated carriers with substantial redox potential. The nanoarchitecture of MOCOF-2 demonstrates the capability to efficiently convert CO₂ into valuable CO and CH₄ fuels, achieving reduction rates of 8.7 and 4.6 μmol∙g^-1∙h^-1, respectively. This study provides a valuable reference for the rational design of COF-based S-scheme heterojunction photocatalysts aimed at solar fuel production.

Key words: Covalent organic framework, S-Scheme heterojunction, Photocatalysis, Solar fuel, Interfacial engineering

LIU Chuang, GAO Tengyuan, WANG Guohong, CHENG Qiang WANG Kai. Efficient CO₂ Photoreduction into Solar Fuels over MoO_3-x/COF S-Scheme Photocatalyst[J]. Chemical Research in Chinese Universities, 2025, 41(4): 726-733.

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Efficient CO₂ Photoreduction into Solar Fuels over MoO_3-x/COF S-Scheme Photocatalyst

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