NDLI: Enhanced photocatalytic H<sub>2</sub>-production activity of graphene-modified titania nanosheets

Content Provider	Royal Society of Chemistry (RSC)
Author	Yu, Jiaguo Jaroniec, Mietek Xiang, Quanjun
Copyright Year	2011
Abstract	Graphene-modified TiO2 nanosheets with exposed (001) facets (graphene/TiO2) were prepared by microwave-hydrothermal treatment of graphene oxide (GO) and hydrothermally synthesized TiO2 nanosheets with exposed (001) facets in an ethanol–water solvent. These nanocomposite samples showed high photocatalytic H2-production activity in aqueous solutions containing methanol, as sacrificial reagent, even without Pt co-catalyst. The optimal graphene content was found to be ∼1.0 wt%, giving a H2-production rate of 736 μmol h−1 g−1 with a quantum efficiency (QE) of 3.1%, which exceeded the rate observed on pure TiO2 nanosheets by more than 41 times. This high photocatalytic H2-production activity is due to the deposition of TiO2 nanosheets on graphene sheets, which act as an electron acceptor to efficiently separate the photogenerated charge carriers. The observed enhancement in the photocatalytic activity is due to the lower absolute potential of graphene/graphene˙− (−0.08 V vs. SHE, pH = 0) in comparison to the conduction band (−0.24 V) of anatase TiO2, meanwhile the aforementioned absolute value is higher than the reduction potential of H+ (0 V), which favors the electron transfer from the conduction band (CB) of TiO2 to graphene sheets and the reduction of H+, thus enhancing photocatalytic H2-production activity. The proposed mechanism for the observed photocatalytic performance of TiO2 nanosheets, modified with a small amount of graphene, was further confirmed by photoluminescence spectroscopy and transient photocurrent response. This work not only shows a possibility for the utilization of low cost graphene sheets as a substitute for noble metals (such as Pt) in the photocatalytic H2-production but also for the first time shows a significant enhancement in the H2-production activity by using metal-free carbon material as an effective co-catalyst.
Starting Page	3670
Ending Page	3678
Page Count	9
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	3
Issue Number	9
Journal	Nanoscale
DOI	10.1039/c1nr10610d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Absorption spectroscopy Citizens band radio Anatase Hydrogen Photoluminescence Reagent Carbon Quantum tunnelling Photocurrent Graphene PH Valence and conduction bands Nanocomposite Solvent Electron acceptor CB Methanol
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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