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Issue 17, 2016
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Visible light driven hydrogen evolution with a noble metal free CuGa2In3S8 nanoparticle system in water

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Abstract

CuGa2In3S8 (CGIS) nanoparticles were synthesised by a hot-injection method and rendered water dispersible by modification with the hydrophilic ligand 3-mercaptopropionic acid (MPA). The CGIS nanoparticles were characterised by X-ray diffraction, transmission electron microscopy, X-ray photoelectron, diffuse reflectance and infrared spectroscopy as well as inductively coupled plasma optical emission spectroscopy. Photocatalytic H2 production using the MPA modified CGIS nanoparticles and a nickel salt under visible light irradiation was achieved from acidic solution (pH 2.6) with ascorbic acid as a sacrificial electron donor. Previously, CGIS required the presence of a precious metal co-catalyst and sulfide ions as a sacrificial reagent in alkaline solution to display photocatalytic activity for H2 generation. In the reported system, visible light irradiation of the MPA modified CGIS nanoparticles with a Ni salt displayed even superior sacrificial H2 evolution activity than when employing the precious metals Pt, Rh and Ru. An external quantum efficiency of more than 12% was achieved at λ = 540 nm, which is almost twice that previously reported for CGIS nanoparticles in the presence of a noble metal co-catalyst and sulfide ions as an electron donor.

Graphical abstract: Visible light driven hydrogen evolution with a noble metal free CuGa2In3S8 nanoparticle system in water

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Publication details

The article was received on 20 May 2016, accepted on 30 Jun 2016 and first published on 30 Jun 2016


Article type: Paper
DOI: 10.1039/C6CY01103A
Author version available: Download Author version (PDF)
Citation: Catal. Sci. Technol., 2016,6, 6536-6541
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    Visible light driven hydrogen evolution with a noble metal free CuGa2In3S8 nanoparticle system in water

    T. A. Kandiel, G. A. M. Hutton and E. Reisner, Catal. Sci. Technol., 2016, 6, 6536
    DOI: 10.1039/C6CY01103A

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