Enhanced Photocatalytic Activity and Electron Transfer Mechanisms of Graphene/TiO2 with Exposed {001} Facets
Enhanced Photocatalytic Activity and Electron Transfer Mechanisms of Graphene/TiO2 with Exposed {001} Facets
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具有暴露的{001}面的石墨烯/TiO2的增强光催化活性和电子转移机制
DOI：
10.1021/jp207624x
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发表时间：
2011-12-08
影响因子：
3.7
通讯作者：
Fu, Honggang
中科院分区：
文献类型：
--
作者：
Jiang, Baojiang;Tian, Chungui;Fu, Honggang
提出了一种简单可行的方法，即通过氢氟酸和甲醇联合溶剂热反应合成具有TiO 2 {001}高能晶面的石墨烯/TiO 2纳米复合材料。在合成过程中，石墨烯均匀地覆盖有大量的TiO 2纳米颗粒（20-25 nm），暴露出{001}面。X射线光电子能谱和X射线吸收测量表明TiO 2和石墨烯之间存在电子转移。此外，瞬态光电压谱的复合材料也表现出延长的平均寿命的电子-空穴对相比，纯TiO 2。Ti和C之间的电子转移将大大阻碍光生载流子的复合，延长电子寿命，有助于提高光催化性能。在紫外光照射下，TiO 2/石墨烯复合材料具有比P25更高的光催化活性，这可能是由于石墨烯对TiO 2/石墨烯复合材料光催化活性的影响。
We present a simple and feasible strategy to synthesize the novel anatase TiO2/graphene composites with exposed TiO2 {001} high-energy facets by the hydrofluoric acid and methanol joint assisted solvothermal reactions. During the synthesis process, graphene was uniformly covered with a large number of anatase TiO2 nanoparticles (20–25 nm), exposing the {001} facets. The X-ray photoelectron spectroscopy and X-ray absorption measurements show the presence of electron transfer between TiO2 and graphene. Furthermore, transient photovoltage spectra of the composite also exhibits prolonged mean lifetime of electron–hole pairs compared with pure TiO2. The electron transfer between Ti and C will greatly retard the recombination of photoinduced charge carriers and prolong electron lifetime, which contribute to the enhancement of photocatalytic performance. During the photocatalysis measurement, the TiO2/graphene composites have high photocatalytic activity compared with the P25 under UV light, likely due to the ef...