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Self-Optimized Catalysts: Hot-Electron Driven Photosynthesis of Catalytic Photocathodes
[Image: see text] Photogenerated hot electrons from plasmonic nanostructures are very promising for photocatalysis, mostly due to their potential for enhanced chemical selectivity. Here, we present a self-optimized fabrication method of plasmonic photocathodes using hot-electron chemistry, for enhan...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American
Chemical Society
2019
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6778899/ https://www.ncbi.nlm.nih.gov/pubmed/31475816 http://dx.doi.org/10.1021/acsami.9b10913 |
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author | Kontoleta, Evgenia Askes, Sven H. C. Garnett, Erik C. |
author_facet | Kontoleta, Evgenia Askes, Sven H. C. Garnett, Erik C. |
author_sort | Kontoleta, Evgenia |
collection | PubMed |
description | [Image: see text] Photogenerated hot electrons from plasmonic nanostructures are very promising for photocatalysis, mostly due to their potential for enhanced chemical selectivity. Here, we present a self-optimized fabrication method of plasmonic photocathodes using hot-electron chemistry, for enhanced photocatalytic efficiencies. Plasmonic Au/TiO(2) nanoislands are excited at their surface plasmon resonance to generate hot electrons in an aqueous bath containing a platinum (cocatalyst) precursor. Hot electrons drive the deposition of Pt cocatalyst nanoparticles, without any nanoparticle functionalization and negligible applied bias, close to the hotspots of the plasmonic nanoislands. The presence of TiO(2) is crucial for achieving higher chemical reaction rates. The Au/TiO(2)/Pt photocathodes synthesized using hot-electron chemistry show a photocatalytic activity of up to 2 times higher than that of a control made with random electrodeposited Pt nanoparticles. This light-driven positioning of the cocatalyst close to the same positions where hot electrons are most efficiently generated and transferred represents a novel and simple method for synthesizing complex, self-optimized photocatalytic nanostructures with improved efficiency and selectivity. |
format | Online Article Text |
id | pubmed-6778899 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | American
Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-67788992019-10-08 Self-Optimized Catalysts: Hot-Electron Driven Photosynthesis of Catalytic Photocathodes Kontoleta, Evgenia Askes, Sven H. C. Garnett, Erik C. ACS Appl Mater Interfaces [Image: see text] Photogenerated hot electrons from plasmonic nanostructures are very promising for photocatalysis, mostly due to their potential for enhanced chemical selectivity. Here, we present a self-optimized fabrication method of plasmonic photocathodes using hot-electron chemistry, for enhanced photocatalytic efficiencies. Plasmonic Au/TiO(2) nanoislands are excited at their surface plasmon resonance to generate hot electrons in an aqueous bath containing a platinum (cocatalyst) precursor. Hot electrons drive the deposition of Pt cocatalyst nanoparticles, without any nanoparticle functionalization and negligible applied bias, close to the hotspots of the plasmonic nanoislands. The presence of TiO(2) is crucial for achieving higher chemical reaction rates. The Au/TiO(2)/Pt photocathodes synthesized using hot-electron chemistry show a photocatalytic activity of up to 2 times higher than that of a control made with random electrodeposited Pt nanoparticles. This light-driven positioning of the cocatalyst close to the same positions where hot electrons are most efficiently generated and transferred represents a novel and simple method for synthesizing complex, self-optimized photocatalytic nanostructures with improved efficiency and selectivity. American Chemical Society 2019-09-02 2019-10-02 /pmc/articles/PMC6778899/ /pubmed/31475816 http://dx.doi.org/10.1021/acsami.9b10913 Text en Copyright © 2019 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. |
spellingShingle | Kontoleta, Evgenia Askes, Sven H. C. Garnett, Erik C. Self-Optimized Catalysts: Hot-Electron Driven Photosynthesis of Catalytic Photocathodes |
title | Self-Optimized
Catalysts: Hot-Electron Driven Photosynthesis
of Catalytic Photocathodes |
title_full | Self-Optimized
Catalysts: Hot-Electron Driven Photosynthesis
of Catalytic Photocathodes |
title_fullStr | Self-Optimized
Catalysts: Hot-Electron Driven Photosynthesis
of Catalytic Photocathodes |
title_full_unstemmed | Self-Optimized
Catalysts: Hot-Electron Driven Photosynthesis
of Catalytic Photocathodes |
title_short | Self-Optimized
Catalysts: Hot-Electron Driven Photosynthesis
of Catalytic Photocathodes |
title_sort | self-optimized
catalysts: hot-electron driven photosynthesis
of catalytic photocathodes |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6778899/ https://www.ncbi.nlm.nih.gov/pubmed/31475816 http://dx.doi.org/10.1021/acsami.9b10913 |
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