SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Poster IV
Q 59.66: Poster
Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof
Design of metasurface for carbon dioxide reduction photocatalysis — •Ning Lyu1,2, Zelio Fusco2, Fiona Beck2, and Christin David1 — 1Institute of Condensed Matter Theory and Optics, Abbe Center of Photonics, Friedrich Schiller University of Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2School of Engineering, Australian National University, Acton ACT 2601, Australia
As artificial photosynthesis, the photocatalytic reduction of CO2 addresses the emission of greenhouse gases by converting them back to organic fuels with solar energy. These redox reactions include multiple electron transfer processes and various products were generated vas separated reaction pathways simultaneously, such as formic acid, formaldehyde, methanol, methane, and some higher hydrocarbons products. Therefore, it is challenging to have a highly efficient, stable conversion of a selected single product. Metasurface with a large surface-to-volume ratio promote the concentration of hot electrons in the active site on surface and have a great potential in photocatalysis and co-catalysis applications.
We investigate how TiO2 metasurfaces with nanopillars (NPs) and hollow nanotubes (NTs) affect selected pathways of CO2 reductions in their optical properties with the Finite Element Method (FEM). Polarization- and angle-sensitive resonances were designed to overlap with selected reaction pathways using asymmetric pitches. By changing the polarization, the absorption efficiency for selected pathways remained at approximately 90% under the solar spectrum, while other pathways varied from about 96% to only 48%.