title: Gold and gold-palladium alloy nanoparticles on heterostructured TiO2 nanobelts as plasmonic photocatalysts for benzyl alcohol oxidation.
abstract: Plasmonic photocatalysts composed of Au and bimetallic Au-Pd alloy nanoparticles (NPs) on one-dimensional TiO2 nanobelts (TiO2-NBs) were used for the aerobic oxidation of benzyl alcohol under visible light irradiation. Remarkable light-promoted activity was observed for the as-synthesized M/TiO2-NB (M = Au, Au-Pd) nanostructures based on the TiO2(B)/anatase heterostructured nanobelt. The difference in band structure and the well matched interface between the TiO2(B) and anatase phases, coupled with the one-dimensional nanostructure, enable an enhanced charge transfer within the heterostructured nanobelt. This inter-phase charge transfer greatly facilitates the flow of hot electrons from the metal NPs to TiO2 and promotes benzyl alcohol oxidation. This efficient electron transfer was identified by the much higher photocurrent response measured for the Au/TiO2-NB nanostructure with the TiO2(B)/anatase heterojunction than those with either of the single phases under visible light irradiation. Alloying Au with Pd in Au-Pd/TiO2-NB results in a significant improvement in the visible light-promoted activity compared to the monometallic Au/TiO2-NB sample. It is supposed that the plasmon-mediated charge distribution within the alloy NPs is mainly responsible for the enhanced photocatalytic activity of the bimetallic nanostructures.
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, 27 Shandanan Road, Jinan 250100, China. xhxu@sdu.edu.cn.
authors.forename: Tongtong
authors.initials: T
authors.lastname: Jiang
authors.forename: Chuancheng
authors.initials: C
authors.lastname: Jia
authors.forename: Lanchun
authors.initials: L
authors.lastname: Zhang
authors.forename: Shuren
authors.initials: S
authors.lastname: He
authors.forename: Yuanhua
authors.initials: Y
authors.lastname: Sang
authors.forename: Haidong
authors.initials: H
authors.lastname: Li
authors.forename: Yanqing
authors.initials: Y
authors.lastname: Li
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Xu
authors.forename: Hong
authors.initials: H
authors.lastname: Liu