Journal
LANGMUIR
Volume 30, Issue 50, Pages 15356-15363Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la504167c
Keywords
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Funding
- Alexander von Humboldt Foundation
- ERC
- DFG
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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.
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