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Light-induced ultrafast proton-coupled electron transfer responsible for H-2 evolution on silver plasmonics
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. South Valley Univ, Qena Fac Sci, Dept Chem, Qena 83523, Egypt.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
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2018 (English)In: Materials Today, ISSN 1369-7021, E-ISSN 1873-4103, Vol. 21, no 6, p. 590-593Article in journal (Refereed) Published
Abstract [en]

Light-driven proton-coupled electron transfer (PCET) reactions on nanoplasmonics would bring temporal control of their reactive pathways, in particular, prolong their charge separation state. Using a silver nano-hybrid plasmonic structure, we observed that optical excitation of Ag-localized surface plasmon instigated electron injection into TiO2 conduction band and oxidation of isopropanol alcoholic functionality. Femtosecond transient infrared absorption studies show that electron transfer from Ag to TiO2 occurs in ca. 650 fs, while IPA molecules near the Ag surface undergo an ultrafast bidirectional PCET step within 400 fs. Our work demonstrates that ultrafast PCET reaction plays a determinant role in prolonging charge separation state, providing an innovative strategy for visible-light photocatalysis with plasmonic nanostructures.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2018. Vol. 21, no 6, p. 590-593
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Physical Chemistry Engineering and Technology
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URN: urn:nbn:se:uu:diva-362849DOI: 10.1016/j.mattod.2018.05.002ISI: 000441765700016OAI: oai:DiVA.org:uu-362849DiVA, id: diva2:1255810
Funder
Swedish Research Council, 2015-03764Stiftelsen Olle Engkvist Byggmästare, 2016/367Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2018-10-18Bibliographically approved

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Hattori, YocefuRocha, IgorPavliuk, Mariia V.Fernandes, Daniel L. A.Sá, Jacinto

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