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
2018 Materials Today  
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 TiO 2 conduction band and oxidation of isopropanol alcoholic functionality. Femtosecond transient infrared absorption studies show that electron transfer
more » ... m Ag to TiO 2 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 visiblelight photocatalysis with plasmonic nanostructures.
doi:10.1016/j.mattod.2018.05.002 fatcat:ldhlyisex5gyrl6f6ig6mjacay