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Gold(Core)–Lead(Shell) Nanoparticle‐Loaded Titanium(IV) Oxide Prepared by Underpotential Photodeposition: Plasmonic Water Oxidation
Author(s) -
Negishi Ryo,
Naya Shinichi,
Kobayashi Hisayoshi,
Tada Hiroaki
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201703093
Subject(s) - photocurrent , materials science , tin oxide , surface plasmon resonance , mesoporous material , plasmon , photoelectrochemistry , titanium , nanoparticle , shell (structure) , underpotential deposition , chemical engineering , titanium oxide , nanotechnology , oxide , inorganic chemistry , electrode , electrochemistry , cyclic voltammetry , chemistry , optoelectronics , composite material , catalysis , metallurgy , biochemistry , engineering
Underpotential photodeposition of Pb yields an ultrathin shell layer on the Au(111) surface of Au nanoparticle(NP)‐loaded TiO 2 (Au/TiO 2 ) with heteroepitaxial nanojunctions. The localized surface plasmon resonance of Au/TiO 2 undergoes no damping with the Pb‐shell formation, and the Pb shell offers resistance to aerobic oxidation. Mesoporous films comprising the Au(core)–Pb(shell) NP‐loaded TiO 2 and unmodified Au/TiO 2 were formed on fluorine‐doped tin oxide (FTO) electrode. Using them as the photoanode, photoelectrochemical cells were fabricated, and the photocurrent was measured under illumination of simulated sunlight. The photocurrent for water splitting is dramatically enhanced by the Pb‐shell formation. The photoelectrochemical measurements of the hot‐electron lifetime and density functional theory calculations for model clusters indicate that the Pb‐shell effect originates from the charge separation enhancement.