title: Enhanced Photoelectrocatalytic Reduction of Oxygen Using Au@TiO2Plasmonic Film.
abstract: Novel Au@TiO2plasmonic films were fabricated by individually placing Au nanoparticles into TiO2nanocavity arrays through a sputtering and dewetting process. These discrete Au nanoparticles in TiO2nanocavities showed strong visible-light absorption due to the plasmonic resonance. Photoelectrochemical studies demonstrated that the developed Au@TiO2plasmonic films exhibited significantly enhanced catalytic activities toward oxygen reduction reactions with an onset potential of 0.92 V (vs reversible hydrogen electrode), electron transfer number of 3.94, and limiting current density of 5.2 mA cm-2. A superior ORR activity of 310 mA mg-1is achieved using low Au loading mass. The isolated Au nanoparticle size remarkably affected the catalytic activities of Au@TiO2, and TiO2coated with 5 nm Au (Au5@TiO2) exhibited the best catalytic function to reduce oxygen. The plasmon-enhanced reductive activity is attributed to the surface plasmonic resonance of isolated Au nanoparticles in TiO2nanocavities and suppressed electron recombination. This work provides comprehensive understanding of a novel plasmonic system using isolated noble metals into nanostructured semiconductor films as a potential alternative catalyst for oxygen reduction reaction.
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Limin
authors.initials: L
authors.lastname: Guo
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Kun
authors.initials: K
authors.lastname: Liang
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Kyle
authors.initials: K
authors.lastname: Marcus
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Li
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Le
authors.initials: L
authors.lastname: Zhou
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Prabhu Doss
authors.initials: PD
authors.lastname: Mani
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Chen
authors.initials: C
authors.lastname: Shen
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Yajie
authors.initials: Y
authors.lastname: Dong
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhai
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Kevin R
authors.initials: KR
authors.lastname: Coffey
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Nina
authors.initials: N
authors.lastname: Orlovskaya
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Yong-Ho
authors.initials: YH
authors.lastname: Sohn
authors.affiliation: NanoScience Technology Center, §Department of Materials Science & Engineering, ⊥College of Optics & Photonics (CREOL), ||College of Engineering, #Department of Chemistry, and ¶Department of Mechanical and Aerospace Engineering, University of Central Florida , 4000 Central Florida Boulevard. Orlando, Florida 32816, United States.
authors.forename: Yang
authors.identifier: http://orcid.org/0000-0002-4410-6021
authors.initials: Y
authors.lastname: Yang
keywords: Au nanoparticle; TiO2 nanocavity array; oxygen reduction reaction; photoelectrocatalysis; plasmonics