Water-phase strategy for synthesis of TiO2-graphene composites with tunable structure for high performance photocatalysts
Water-phase strategy for synthesis of TiO2-graphene composites with tunable structure for high performance photocatalysts
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水相策略合成具有可调结构的高性能光催化剂TiO2-石墨烯复合材料
DOI：
10.1016/j.apsusc.2014.08.161
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发表时间：
2014-10-30
影响因子：
6.7
通讯作者：
Zhang, Rongbin
中科院分区：
文献类型：
--
作者：
Hua, Changyuan;Chen, Fei;Zhang, Rongbin
强耦合TiO2/石墨烯复合材料的可控合成一直是开发先进光催化剂的一个长期挑战。在这里，我们报告了一个简单的水相协议，用于合成二氧化钛-石墨烯复合材料使用GO水悬浮液和二氧化钛水纳米溶胶作为前体。通过控制GO与TiO 2的比例，通过带负电的GO纳米片和带正电的TiO 2纳米溶胶之间的静电吸引，成功地实现了石墨烯上的高/低密度TiO 2纳米颗粒和石墨烯-TiO 2-石墨烯三明治结构复合材料。TiO2-石墨烯复合材料在紫外光下对亚甲基蓝（MB）的光催化降解表现出较强的光催化活性。有趣的是，三明治结构的TiO2-石墨烯复合物具有最好的光催化活性和最高的光电流密度，分别是纯TiO2的12.2和35.46倍。三明治结构复合材料优异的光催化活性可能是由于TiO2和石墨烯之间的双通道电子传导路径以及MB分子较好的吸附能力两个原因。(C)2014爱思唯尔有限公司版权所有。
The controllable synthesis of strongly coupled TiO2/graphene composites has been a long-standing challenge for developing advanced photocatalysts. Here, we report a facile water-phase protocol for synthesis of TiO2-graphene composites using GO aqueous suspension and TiO2 aqueous nanosols as precursors. By controlling the ratio of GO to TiO2, both high-/low-dense TiO2 nanoparticles across graphene and graphene-TiO2-graphene sandwich structured composites are successfully achieved through electrostatic attraction between negatively charged GO nanosheets and positively charged TiO2 nanosols. The TiO2-graphene composites show an enhanced photocatalytic activity for the degradation of methylene blue (MB) under UV light. Interestingly, the sandwich structured TiO2-graphene composite exhibits the best photocatalytic activity and the highest photocurrent density, which is 12.2 and 35.46 times as that of pure TiO2, respectively. The outstanding photocatalytic activity of sandwich structured composite is likely due to the following two reasons, two-channel electron conduction path between TiO2 and graphene, as well as the better adsorption capability of MB molecule. (C) 2014 Elsevier B.V. All rights reserved.