Microwave-assisted hydrothermal synthesis of graphene based Au–TiO2 photocatalysts for efficient visible-light hydrogen production

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Abstract

Au–TiO2–graphene photocatalysts display high visible-light hydrogen production activity due to the load of Au nanoparticles and introduction of graphene.

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Two-Dimensional Gas of Massless Dirac Fermions in Graphene

A Firsov, I. Grigorieva, S Dubonos … (2005)

Electronic properties of materials are commonly described by quasiparticles that behave as non-relativistic electrons with a finite mass and obey the Schroedinger equation. Here we report a condensed matter system where electron transport is essentially governed by the Dirac equation and charge carriers mimic relativistic particles with zero mass and an effective "speed of light" c* ~10^6m/s. Our studies of graphene - a single atomic layer of carbon - have revealed a variety of unusual phenomena characteristic of two-dimensional (2D) Dirac fermions. In particular, we have observed that a) the integer quantum Hall effect in graphene is anomalous in that it occurs at half-integer filling factors; b) graphene's conductivity never falls below a minimum value corresponding to the conductance quantum e^2/h, even when carrier concentrations tend to zero; c) the cyclotron mass m of massless carriers with energy E in graphene is described by equation E =mc*^2; and d) Shubnikov-de Haas oscillations in graphene exhibit a phase shift of pi due to Berry's phase.

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Flexible graphene films via the filtration of water-soluble noncovalent functionalized graphene sheets.

Yuxi Xu, Hua Bai, Gewu Lu … (2008)

Flexible graphene films were prepared by the filtration of water-soluble noncovalently functionalized graphene sheets with pyrenebutyrate. The work presented here will not only open a new way for preparing water-soluble graphene dispersions but also provide a general route for fabricating conducting films based on graphene.

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Synergetic effect of MoS2 and graphene as cocatalysts for enhanced photocatalytic H2 production activity of TiO2 nanoparticles.

Quanjun Xiang, Jiaguo Yu, Mietek Jaroniec (2012)

The production of H(2) by photocatalytic water splitting has attracted a lot attention as a clean and renewable solar H(2) generation system. Despite tremendous efforts, the present great challenge in materials science is to develop highly active photocatalysts for splitting of water at low cost. Here we report a new composite material consisting of TiO(2) nanocrystals grown in the presence of a layered MoS(2)/graphene hybrid as a high-performance photocatalyst for H(2) evolution. This composite material was prepared by a two-step simple hydrothermal process using sodium molybdate, thiourea, and graphene oxide as precursors of the MoS(2)/graphene hybrid and tetrabutylorthotitanate as the titanium precursor. Even without a noble-metal cocatalyst, the TiO(2)/MoS(2)/graphene composite reaches a high H(2) production rate of 165.3 μmol h(-1) when the content of the MoS(2)/graphene cocatalyst is 0.5 wt % and the content of graphene in this cocatalyst is 5.0 wt %, and the apparent quantum efficiency reaches 9.7% at 365 nm. This unusual photocatalytic activity arises from the positive synergetic effect between the MoS(2) and graphene components in this hybrid cocatalyst, which serve as an electron collector and a source of active adsorption sites, respectively. This study presents an inexpensive photocatalyst for energy conversion to achieve highly efficient H(2) evolution without noble metals. © 2012 American Chemical Society

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Journal

Journal ID (publisher-id): JMCAET

Title: J. Mater. Chem. A

Abbreviated Title: J. Mater. Chem. A

Publisher: Royal Society of Chemistry (RSC)

ISSN (Print): 2050-7488

ISSN (Electronic): 2050-7496

Publication date Created: 2014

Publication date (Print): 2014

Volume: 2

Issue: 11

Pages: 3847-3855

Article

DOI: 10.1039/C3TA14908K

SO-VID: 5b1f59f9-b0e0-4424-bfc6-415535112235

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Microwave-assisted hydrothermal synthesis of graphene based Au–TiO2 photocatalysts for efficient visible-light hydrogen production

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Most cited references 58

Two-Dimensional Gas of Massless Dirac Fermions in Graphene

Flexible graphene films via the filtration of water-soluble noncovalent functionalized graphene sheets.

Synergetic effect of MoS2 and graphene as cocatalysts for enhanced photocatalytic H2 production activity of TiO2 nanoparticles.

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