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Mechanism of the photocatalytic CO2 reduction by graphene supported Cu2O probed by sacrificial electron donors

Abstract

Cu2O nanoparticles of 5 nm average size have been adsorbed at 7.46 wt. % on defective graphene (Cu2O/G) previously obtained by pyrolysis of alginic acid. The Cu2O crystal phase determined by XRD. XPS shows that the external layers of the Cu2O nanoparticles are contituted mainly by Cu+I although a certain percentage of Cu+II was also present. Cu2O/G is a photocatalyst for the CO2 reduction to methane in the presence of sacrificial agents, the rate of CH4 production depending on the oxidation potential of the electron donor. This relationship supports a mechanism involving photoinduced charge separation with the generation of electron and holes. The highest CH4 formation rate upon UV-Vis irradiation of Cu2O/G with a 300 W Xe lamp was achieved for dimethylaniline reaching 326 µmol CH4·g-1·h-1. The photoaction spectrum of the Cu2O photocatalyst shows, however, that the response of the photocatalyst is mainly due to UV irradiation, indicating that light absorption at the low Cu2O loading on Cu2O/G photocatalyst occurs mainly on the graphene component.

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Publication details

The article was received on 05 Dec 2017, accepted on 02 May 2018 and first published on 03 May 2018


Article type: Paper
DOI: 10.1039/C7PP00442G
Citation: Photochem. Photobiol. Sci., 2018, Accepted Manuscript
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    Mechanism of the photocatalytic CO2 reduction by graphene supported Cu2O probed by sacrificial electron donors

    D. Mateo, A. M. Asiri, J. Albero and H. Garcia, Photochem. Photobiol. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C7PP00442G

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