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Synthesis of N-doped graphene-functionalized Zn1.231Ge0.689N1.218O0.782 solid solution as a photocatalyst for CO2 reduction and oxidation of benzyl alcohol under visible-light irradiation

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Abstract

N-doped graphene/Zn1.231Ge0.689N1.218O0.782 (N-graphene/ZnGeON) hybrid composites were assembled through electrostatic adsorption of positively charged Zn2GeO4 nanorods with negatively charged graphene oxide (GO) and calcination using a high temperature in situ nitridation technique under NH3 flow. During this two-stage chemical process, the ZnGeON solid solution is tightly wrapped by ultrathin N-graphene sheets. Detailed investigations indicated that the N-graphene/ZnGeON hybrids could not only catalyze the evolution of CH4 from the photocatalytic reaction of CO2 and H2O, but also catalyze the evolution of benzaldehyde from the photocatalytic reaction of benzyl alcohol and O2 under visible-light irradiation. The enhanced photocatalytic performances observed over N-graphene/ZnGeON hybrids can be traced to the existence of highly conductive N-graphene sheets which provide strong interfacial contact with the ZnGeON solid solution. It is suggested that the synergistic effect between ZnGeON and N-graphene in the hybrids is beneficial for photogenerated carrier transfer from ZnGeON to N-graphene, and it was found that the latter is used not just as an electron acceptor and mediator, but as a co-catalyst for the photoreduction of CO2 and oxidation of benzyl alcohol. This work has proven to be a technologically feasible and chemically efficient strategy for the development of N-graphene-involved hybrid semiconductor photocatalysts toward many desired applications.

Graphical abstract: Synthesis of N-doped graphene-functionalized Zn1.231Ge0.689N1.218O0.782 solid solution as a photocatalyst for CO2 reduction and oxidation of benzyl alcohol under visible-light irradiation

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Publication details

The article was received on 12 Mar 2017, accepted on 02 May 2017 and first published on 03 May 2017


Article type: Paper
DOI: 10.1039/C7TA02192E
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Synthesis of N-doped graphene-functionalized Zn1.231Ge0.689N1.218O0.782 solid solution as a photocatalyst for CO2 reduction and oxidation of benzyl alcohol under visible-light irradiation

    J. Liang and L. Li, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA02192E

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