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Article
Understanding the Enhancement in Photoelectrochemical Properties of Photocatalytically Prepared TiO2-reduced Graphene Oxide Composite
Journal of Physical Chemistry C (2011)
  • Nicholas J. Bell
  • Yun Hau Ng
  • Aijun Du
  • Hans Coster
  • Sean C. Smith
  • Rose Amal
Abstract

Solution-phase photocatalytic reduction of graphene oxide (GO) to reduced graphene oxide (RGO) by titanium dioxide (TiO2) nanoparticles produces an RGO-TiO2 composite that possesses enhanced charge transport properties beyond those of pure TiO2 nanoparticle films. These composite films exhibit electron lifetimes up to four times longer than that of intrinsic TiO2 films due to RGO acting as a highly conducting intra-particle charge transport network within the film. The intrinsic UV-active charge generation (photocurrent) of pure TiO2 was enhanced by a factor of ten by incorporating RGO; we attribute this to both the highly conductive nature of the RGO and to improved charge collection facilitated by the intimate contact between RGO and the TiO2 - uniquely afforded by the solution-phase photocatalytic reduction method. Integrating RGO into nanoparticle films using this technique should improve the performance of photovoltaic devices that utilize nanoparticle films, such as dye-sensitized and quantum-dot sensitized solar cells.

Keywords
  • Graphene,
  • photoelectrochemical cell,
  • photocatalysis,
  • thin film,
  • charge transport
Publication Date
April, 2011
Citation Information
Nicholas J. Bell, Yun Hau Ng, Aijun Du, Hans Coster, et al.. "Understanding the Enhancement in Photoelectrochemical Properties of Photocatalytically Prepared TiO2-reduced Graphene Oxide Composite" Journal of Physical Chemistry C Vol. 115 (2011)
Available at: http://works.bepress.com/yunhau_ng/29/