Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Metal substrates 2
O 42.5: Vortrag
Mittwoch, 7. September 2022, 11:30–11:45, S053
A µ-Photoreactor for Investigating Planar Hydrogen Evolution Catalysts at Ambient Condition — •Clara Aletsee, Martin Tschurl, and Ueli Heiz — Physical Chemistry, Department of Chemistry & Catalysis Research Center, Technical University of Munich
Photocatalytic water splitting and alcohol reforming offer promising alternatives for clean H2 production, in contrast to the industrially applied steam reforming of fossil fuels. However, the understanding of the reaction mechanisms ,which is indispensable for tailored performance improvement, is complicated by the structural complexity of powdered catalyst. In contrast, well-defined planar catalysts are already used for fundamental studies in ultra-high vacuum, but a simple extrapolation of the results to applied conditions is impractical due to a significant pressure difference.
Herein, we present a µ-photoreactor for the evaluation of planar model catalysts like single crystals or epitaxially grown semiconductors at ambient conditions in a continuous gas flow. In this system, the catalyst serves as the bottom of the reactor, while a 200 µm O-ring on top defines the reactor volume of 12 µL. It is sealed by a UV-vis transparent lid with lithographically implemented channels for the gas flow toward the quadrupole mass spectrometer for product analysis. The functionality is demonstrated by ethanol photoreforming over a Pt loaded TiO2 catalyst.
This concept will not only enable the evaluation of planar photocatalysts, but also the investigation of the transferability of UHV results to applied systems.