Enhanced photocatalytic H2-production activity of graphene-modified titania nanosheets

Graphene-modified TiO2nanosheets with exposed facets were prepared by microwave-hydrothermal treatment of graphene oxide and hydrothermally synthesized TiO2nanosheets with exposed facets in an ethanol–watersolvent

Quanjun Xiang; Jiaguo Yu; Mietek Jaroniec

2011

Scholarcy highlights

  • Graphene-modified TiO2nanosheets with exposed facets were prepared by microwave-hydrothermal treatment of graphene oxide and hydrothermally synthesized TiO2nanosheets with exposed facets in an ethanol–watersolvent
  • 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 of 3.1%, which exceeded the rate observed on pure TiO2nanosheets by more than 41 times
  • This high photocatalytic H2-production activity is due to the deposition of TiO2nanosheets 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− in comparison to the conduction band of anatase TiO2, the aforementioned absolute value is higher than the reduction potential of H+, which favors the electron transfer from the conduction band of TiO2 to graphene sheets and the reduction of H+, enhancing photocatalytic H2-production activity
  • This work shows a possibility for the utilization of low cost graphene sheets as a substitute for noble metals in the photocatalytic H2-production and for the first time shows a significant enhancement in the H2-production activity by using metal-free carbon material as an effective co-catalyst
  • This article is part of the themed collection: Nanoscale 10th Anniversary: Top Cited Articles

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