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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: Focus Session: Novel Approaches to Surface Plasmon Generated Charges and Heat for Photocatalysis II (joint session O/CPP)

CPP 40.2: Talk

Thursday, March 21, 2024, 11:00–11:15, MA 141

Plasmon assisted Catalytic Conversion of CO2 with Disordered Cu-Pd Network — •Oliver Wipf¹, Jelena Wohlwend¹, David Kiwic², Markus Niederberger², Ralph Spolenak¹, and Henning Galinski¹ — ¹Laboratory for Nanometallurgy, ETH Zürich, Switzerland — ²Laboratory for Multifunctional Materials, ETH Zürich, Switzerland

The catalytic conversion of carbon dioxide is currently at the forefront of research as a way to mitigate the climate crisis by capturing CO2 and turning it into functional chemical components. However, currently this is a high energy consumption process, thus, developing efficient catalysts is critical. Using solar radiation to drive and catalyze chemical reactions could address this challenge. Here, we explore the plasmon assisted catalytic conversion of CO2 with disordered network metamaterials (DNMs). DNMs are an emerging class of metamaterials with tunable quasi-perfect absorption over a broad range of wavelengths. The optical response of such disordered networks can be conceptualized as coupled dipole-like networks, where the disorder of the metallic network traps and localizes surface plasmon (SP) waves. In this work we harness DNMs as a platform to drive the conversion of CO2 by taking advantage of "hot" carriers, i.e. electron-hole (e-h) pairs, resulting from the non-radiative decay of plasmons. The generation of hot carriers is dependent on the chemistry and the local geometry, both tailorable with our fabrication route. Furthermore, we show that through chemical engineering of the DNMs, selectivity of the reaction products can be achieved.

Keywords: plasmon assisted catalysis; disordered network metamaterials; tunable selectivity; CO2 reduction