Quantification and description of photothermal heating effects in plasmon-assisted electrochemistry.

Autor: Al-Amin M; Department of Chemistry, University of Louisville, Louisville, KY, 40292, USA., Hemmer JV; Department of Chemistry, University of Louisville, Louisville, KY, 40292, USA., Joshi PB; Department of Chemistry, University of Louisville, Louisville, KY, 40292, USA.; Duke University, Durham, NC, 27708, USA., Fogelman K; Department of Chemistry, University of Louisville, Louisville, KY, 40292, USA., Wilson AJ; Department of Chemistry, University of Louisville, Louisville, KY, 40292, USA. aj.wilson@louisville.edu.
Jazyk: angličtina
Zdroj: Communications chemistry [Commun Chem] 2024 Apr 01; Vol. 7 (1), pp. 70. Date of Electronic Publication: 2024 Apr 01.
DOI: 10.1038/s42004-024-01157-8
Abstrakt: A growing number of reports have demonstrated plasmon-assisted electrochemical reactions, though debate exists around the mechanisms underlying the enhanced activity. Here we address the impact of plasmonic photothermal heating with cyclic voltammetry measurements and finite-element simulations. We find that plasmonic photothermal heating causes a reduction in the hysteresis of the anodic and cathodic waves of the voltammograms along with an increase in mass-transport limiting current density due to convection induced by a temperature gradient. At slow scan rates, a temperature difference as low as 1 K between the electrode surface and bulk electrolytic solution enhances the current density greater than 100%. Direct interband excitation of Au exclusively enhances current density by photothermal heating, while plasmon excitation leads to photothermal and nonthermal enhancements. Our study reveals the role of temperature gradients in plasmon-assisted electrochemistry and details a simple control experiment to account for photothermal heating.
(© 2024. The Author(s).)
Databáze: MEDLINE
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