2022 Annual Meeting
(177d) Elucidating the Roles of Nanoparticle Clustering and Equilibrium Heating in Plasmonic Catalysts Under Continuous Broadband Illumination
In this work, we shed light on the relative contributions of these effects by characterizing photothermal equilibrium catalyst heating under continuous broadband illumination. We first introduce a new photoreactor platform which facilitates superior thermal and photothermal temperature and reaction characterization. Next, we employ this reactor to compare reaction rate enhancement for CO oxidation over plasmonic Ag/Al2O3 catalysts. By varying the Ag weight loading, we explore the role of equilibrium heating and collective effects emerging from increasing particle density and clustering on the support. Pairing experimentally obtained in-operando temperature measurements and reaction rate data, we show that the contribution of photothermal equilibrium heating at low to moderate loadings cannot exclusively explain the extent of rate enhancement. Instead, only at high weight loadings do we observe significant contributions from collective effects.
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