Tunable Syngas Synthesis from Photocatalytic CO₂ Reduction Under Visible-Light Irradiation by Interfacial Engineering

Abstract

Visible-light-driven CO₂ photoreduction to achieve renewable materials, such as syngas, hydrocarbons, and alcohols, is a key process that could relieve environmental problems and the energy crisis simultaneously. Reduction of syngas products with different H₂:CO proportions is highly expected to produce high value-added chemicals in the industry. However, the development of technologies employing long-wavelength irradiation to achieve CO₂ photoreduction and simultaneous tuning of the resultant H₂:CO proportion remains a challenging endeavor. In this work, we carried out interfacial engineering by designing a series of heterostructured layered double-hydroxide/MoS₂ nanocomposites via electrostatic self-assembly. The syngas proportion (H₂:CO) obtained from CO₂ photoreduction could be modulated from 1:1 to 9:1 by visible-light irradiation (λ > 400 nm) under the control of the interface-rich heterostructures. This work provides a cost-effective strategy for solar-to-fuel conversion in an artificial photosynthetic system and describes a novel route to produce syngas with targeted proportions.

Keywords

Interfacial engineering / LDH/MoS₂ / CO₂ photoreduction / Syngas synthesis / Heterostructure

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