Multichannel Electron Transmission and Fluorescence Resonance Energy Transfer in In₂S₃/Au/rGO Composite for CO₂ Photoreduction

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Abstract

Efficient electron transmission is an important step in the process of CO₂ photoreduction. In this paper, a multi-interface-contacted In₂S₃/Au/reduced graphene oxide (rGO) photocatalyst with the fluorescence resonance energy transfer (FRET) mechanism has been successfully prepared by the solvothermal, self-assembly, and hydrothermal reduction processes. Photocatalytic CO₂ reduction experiments showed that the In₂S₃/Au/rGO (IAr-3) composite exhibited excellent photoreduction performance and photocatalytic stability. The yields of CO and CH₄ obtained after the photoreduction process with IAr-3 as the catalyst were around 4 and 6 times higher than those of pure In₂S₃, respectively. Photoelectrochemical analysis showed that the multi-interface contact and FRET mechanism greatly improved the generation, transmission, and separation efficiency of carriers photogenerated within the photocatalyst. In situ FTIR test was applied to analyze the photocatalytic CO₂ reduction process. 13C isotope tracer test confirmed that the carbon source of CO and CH₄ was the CO₂ molecules in the photoreduction process rather than the decomposition of catalyst or TEOA. A potential enhanced photocatalytic mechanism has been discussed in total.

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