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H2 Mapping on Pt-Loaded TiO2 Nanotube Gradient Arrays

Loget, G., Schmuki, P.
Langmuir 2014 v.30 no.50 pp. 15356-15363
hydrogen, hydrogen production, nanoparticles, nanotubes, photocatalysis, physicochemical properties, rapid methods, titanium dioxide
We describe a rapid screening technique for determining the optimal characteristics of nanophotocatalysts for the production of H₂ 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.