Fluorescein-sensitized Au/g-C3N4 nanocomposite for enhanced photocatalytic hydrogen evolution under visible light
Source abstract
Abstract
Abstract Au/g-C3N4 composite is prepared through protonation of g-C3N4, followed by electrostatic adsorption of AuCl4− and subsequent chemical reduction. The homogeneous deposition of Au nanoparticles with an average diameter of 4.1 nm on g-C3N4 is confirmed by TEM measurement. Compared with pure g-C3N4, Au/g-C3N4 composite exhibits a significant improvement in the photocatalytic activity for H2 production from water in the presence of triethanolamine as sacrificial electron donor under visible light irradiation (λ > 420 nm). Significantly, the rate of H2 production increases more than 22 times by adding fluorescein in the photocatalytic reaction system. It is more than 25 times higher than that of protonated g-C3N4 in the presence of fluorescein. Based on our experimental results, the mechanism of photocatalytic activity for H2 evolution over fluorescein-sensitized Au/g-C3N4 nanocomposite is accordingly proposed. The highly-improved performance is ascribed to the efficient transfer of photo-generated electrons among photo-excited fluorescein molecule, g-C3N4 and Au, which is supported by photoluminescence spectra and transient photocurrent responses.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Nanocluster Synthesis and Applications · Advanced Nanomaterials in Catalysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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