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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 Lyu^1,2, 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%.