Understanding the Enhancement in Photoelectrochemical Properties of Photocatalytically Prepared TiO2-Reduced Graphene Oxide Composite
Understanding the Enhancement in Photoelectrochemical Properties of Photocatalytically Prepared TiO2-Reduced Graphene Oxide Composite
复制标题
DOI：
10.1021/jp1113575
复制
发表时间：
2011-04-07
影响因子：
3.7
通讯作者：
Amal, Rose
中科院分区：
文献类型：
--
作者：
Bell, Nicholas J.;Ng, Yun Hau;Amal, Rose
二氧化钛 (TiO2) 纳米粒子将氧化石墨烯溶液相光催化还原为还原氧化石墨烯 (RGO)，产生 RGO-TiO2 复合材料，其电荷传输性能优于纯 TiO2 纳米粒子薄膜。由于 RGO 在薄膜内充当高度导电的颗粒内电荷传输网络，这些复合薄膜的电子寿命比本征 TiO2 薄膜长四倍。通过加入 RGO，纯 TiO2 的固有 UV 活性电荷生成（光电流）增强了 10 倍；我们将此归因于 RGO 的高导电性，以及 RGO 和 TiO2 之间的紧密接触促进的电荷收集的改善，这是溶液相光催化还原方法所独有的。使用这种技术将 RGO 集成到纳米粒子薄膜中应该可以提高利用纳米粒子薄膜的光伏器件的性能，例如染料敏化和量子点敏化太阳能电池。
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.