Understanding the Enhancement in Photoelectrochemical Properties of Photocatalytically Prepared TiO2-Reduced Graphene Oxide Composite

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• 作者：Nicholas J. Bell ; Yun Hau Ng ; Aijun Du ; Hans Coster ; Sean C. Smith ; Rose Amal
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：April 7, 2011
• 年：2011
• 卷：115
• 期：13
• 页码：6004-6009
• 全文大小：881K
• 年卷期：v.115,no.13(April 7, 2011)
• ISSN：1932-7455

文摘

Solution-phase photocatalytic reduction of graphene oxide 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 intraparticle charge transport network within the film. The intrinsic UV-active charge generation (photocurrent) of pure TiO₂ was enhanced by a factor of 10 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.