Light-induced ultrafast proton-coupled electron transfer responsible for H2 evolution on silver plasmonics

Yocefu Hattori, Mohamed Abdellah, Igor Rocha, Mariia V. Pavliuk, Daniel L.A. Fernandes, Jacinto Sá

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)590-593
Number of pages4
JournalMaterials Today
Volume21
Issue number6
DOIs
Publication statusPublished - Jul 1 2018
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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