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Issue 29, 2014
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A few-layer graphene–graphene oxide composite containing nanodiamonds as metal-free catalysts

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Abstract

We report a high yield exfoliation of few-layer-graphene (FLG) with up to 17% yield from expanded graphite, under 5 h sonication time in water, using graphene oxide (GO) as a surfactant. The aqueous dispersion of GO attached FLG (FLG–GO), with less than 5 layers, is used as a template for further decoration of nanodiamonds (NDs). The hybrid materials were self-organized into 3D-laminated nanostructures, where spherical NDs with a diameter of 4–8 nm are homogeneously distributed on the surface of the FLG–GO complex (referred to as FLG–GO@NDs). It was found that GO plays a dual role, it (1) mediated exfoliation of expanded graphite in aqueous solution resulting in a FLG–GO colloid system, and (2) incorporated ND particles for the formation of composites. A high catalytic performance in the dehydrogenation of ethyl-benzene on FLG–GO@ND metal-free catalyst is achieved; 35.1% of ethylbenzene conversion and 98.6% styrene selectivity after a 50 h reaction test are observed which correspond to an activity of 896 mmolST gcatalyst−1 h−1, which is 1.7 and 5 times higher than those of the unsupported NDs and traditional catalysts, respectively. The results demonstrate the potential of the FLG–GO@ND composite as a promising catalyst for steam-free industrial dehydrogenation applications.

Graphical abstract: A few-layer graphene–graphene oxide composite containing nanodiamonds as metal-free catalysts

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Publication details

The article was received on 18 Mar 2014, accepted on 25 Apr 2014 and first published on 13 Jun 2014


Article type: Paper
DOI: 10.1039/C4TA01307G
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. A, 2014,2, 11349-11357
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    A few-layer graphene–graphene oxide composite containing nanodiamonds as metal-free catalysts

    T. T. Thanh, H. Ba, L. Truong-Phuoc, J. Nhut, O. Ersen, D. Begin, I. Janowska, D. L. Nguyen, P. Granger and C. Pham-Huu, J. Mater. Chem. A, 2014, 2, 11349
    DOI: 10.1039/C4TA01307G

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