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A straightforward method to prepare supported Au clusters by mechanochemistry and its application in photocatalysis
Applied Materials Today ( IF 8.3 ) Pub Date : 2020-11-05 , DOI: 10.1016/j.apmt.2020.100873
Yufen Chen , Lluís Soler , Chenyang Xie , Xavier Vendrell , Jarosław Serafin , Daniel Crespo , Jordi Llorca

Reducing the metal particle size on semiconductor-based materials from a few nanometers down to well-dispersed clusters or single atoms has been demonstrated to be an effective strategy to enhance the photocatalytic performance. However, designing a simple and fast synthesis procedure has consistently been a challenge. In this work, gold clusters have been easily synthesized and dispersed onto TiO2 surface by one-step ball milling from TiO2 and gold acetate. The Au clusters strongly interact with TiO2 and the resulting material exhibits outstanding photocatalytic performances on the generation of hydrogen under UV and visible light, which double those obtained on conventional Au/TiO2 photocatalysts containing Au nanoparticles. We have studied the effect of various preparation parameters and characterized the samples by a variety of microscopic and spectroscopic techniques. The particular architecture accomplished by ball milling results in efficient charge separation, low charge transfer resistance and high photocurrent response. This mechanochemical method not only provides a facile and cost-effective alternative to the conventional methods of fabricating Au/TiO2 catalysts, but also opens a promising avenue for developing other ultrasmall metal clusters onto different supports.



中文翻译:

机械化学制备负载型金团簇的简单方法及其在光催化中的应用

将半导体基材料上的金属粒度从几纳米减小到分散良好的簇或单个原子已被证明是增强光催化性能的有效策略。然而,设计一个简单而快速的合成程序一直是一个挑战。在这项工作中,金团簇很容易合成,并通过TiO 2和醋酸金的一步球磨将其分散在TiO 2表面上。Au团簇与TiO 2强烈相互作用,所得材料在紫外光和可见光下对氢的生成表现出杰出的光催化性能,是传统Au / TiO 2的两倍含有Au纳米粒子的光催化剂。我们研究了各种制备参数的影响,并通过各种显微镜和光谱技术对样品进行了表征。通过球磨完成的特定架构可实现有效的电荷分离,低的电荷转移电阻和高的光电流响应。这种机械化学方法不仅为制造Au / TiO 2催化剂的常规方法提供了一种简便且经济高效的替代方法,而且为将其他超小型金属团簇开发到不同载体上开辟了一条有希望的途径。

更新日期:2020-11-06
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