Gold and gold-palladium alloy nanoparticles on heterostructured TiO sub(2) nanobelts as plasmonic photocatalysts for benzyl alcohol oxidation

Plasmonic photocatalysts composed of Au and bimetallic Au-Pd alloy nanoparticles (NPs) on one-dimensional TiO sub(2) nanobelts (TiO sub(2)-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/TiO sub(2)-NB (M = Au, Au-Pd) nanostructures based on the TiO sub(2)(B)/anatase heterostructured nanobelt. The difference in band structure and the well matched interface between the TiO sub(2)(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 TiO sub(2) and promotes benzyl alcohol oxidation. This efficient electron transfer was identified by the much higher photocurrent response measured for the Au/TiO sub(2)-NB nanostructure with the TiO sub(2)(B)/anatase heterojunction than those with either of the single phases under visible light irradiation. Alloying Au with Pd in Au-Pd/TiO sub(2)-NB results in a significant improvement in the visible light-promoted activity compared to the monometallic Au/TiO sub(2)-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.