Unique Electrochemical Catalytic Behavior of Pt Nanoparticles Deposited on TiO2 Nanotubes
Unique Electrochemical Catalytic Behavior of Pt Nanoparticles Deposited on TiO2 Nanotubes
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DOI：
10.1021/cs200691a
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发表时间：
2012-02
期刊：
影响因子：
12.9
通讯作者：
M. Tian;Guosheng Wu;Aicheng Chen
中科院分区：
文献类型：
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作者：
M. Tian;Guosheng Wu;Aicheng Chen
在这项研究中，我们已经直接沉积Pt纳米粒子上的二氧化钛纳米管（TiO 2/Pt）使用一个简单的光辅助还原方法。沉积在TiO 2纳米管阵列上的Pt纳米颗粒具有较大的电化学活性表面积，并表现出显着的动力学行为。氧化物形成和还原的峰逐渐降低，并最终在800次循环后完全消失，而氢吸附和解吸的积分电荷达到恒定值，约为初始值的70%。此外，在电化学处理的TiO 2/Pt电极上观察到的甲醇氧化的S形循环伏安图与在体Pt电极上获得的结果显著不同。在这项研究中描述的自更新功能和解剖结构的重建二氧化钛负载的Pt纳米粒子提供了一种新的方法，用于提高催化活性的Pt纳米材料在可再生能源应用。
In this study, we have directly deposited Pt nanoparticles on TiO2 nanotubes (TiO2/Pt) using a facile photoassisted reduction method. The Pt nanoparticles deposited on the TiO2 nanotube arrays possess a large electrochemically active surface area and exhibit remarkable kinetic behaviors. The peaks for the oxide formation and reduction progressively decrease and eventually disappear completely after 800 cycles, whereas the integrated charge for hydrogen adsorption and desorption reaches a constant, ∼70% of the initial value. In addition, an S-shaped cyclic voltammogram observed for the methanol oxidation at the electrochemically treated TiO2/Pt electrode was dramatically different from the results obtained at a bulk Pt electrode. The self-refreshment functionality and anatomy of the reconstructed TiO2-supported Pt nanoparticles described in this study provide a new approach for improving the catalytic activity of Pt nanomaterials in renewable energy applications.