H2 Mapping on Pt-Loaded TiO2 Nanotube Gradient Arrays
H2 Mapping on Pt-Loaded TiO2 Nanotube Gradient Arrays
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DOI：
10.1021/la504167c
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发表时间：
2014-12-23
期刊：
影响因子：
3.9
通讯作者：
Schmuki, P.
中科院分区：
文献类型：
--
作者：
Loget, G.;Schmuki, P.
我们描述了一种快速筛选技术，用于确定在单一表面上生产H-2的纳米光催化剂的最佳特性。采用双极阳极氧化法制备了长度和直径均呈梯度分布的纳米管阵列，并通过拓扑选择性修饰形成了垂直梯度的铂纳米管(NPs)。用紫外光激光束局部触发光催化析氢，并在x和y方向上对阵列进行筛选，以进行空间分辨的动力学测量和最佳产氢图谱。通过使用这种技术，我们展示了用于优化氢气生产的管子尺寸和铂装载量的时间效率和直接确定。由于纳米光催化剂的物理化学特性，这一概念有望全面改善许多光反应的研究，这使得它对各种重要的化学过程的优化具有极大的吸引力。
We describe a rapid screening technique for determining the optimal characteristics of nanophotocatalysts for the production of H-2 on a single surface. Arrays of TiO2 nanotubes (NTs) with a gradient in length and diameter were fabricated by bipolar anodization, and a perpendicular gradient of Pt nanoparticles (NPs) was generated by the toposelective decoration of the TiO2 NTs. Photocatalytic hydrogen evolution was locally triggered with a UV laser beam, and the arrays were screened in the x and y directions for spatially resolved kinetic measurements and the mapping of the optimal hydrogen production. By using this technique, we demonstrate the time-efficient and straightforward determination of the tube dimensions and Pt loading for optimized H2 production. The concept holds promise for generally improving the study of many photoreactions as a function of the physicochemical characteristic of nanophotocatalysts, which renders it highly attractive for the optimization of various important chemical processes.