Preparation of Au-Pd Core-shell Nanoparticles Supported TiO2 and Influence of Photocatalytic Activity on the Shell Thickness

TiO2 Photocatalysts fixed with Au core Pd shell (Au@Pd) nanoparticle were prepared by ultrasonic irradiation. We prepared Au@Pd Nanoparticles with constant core size and controlled shell thickness, and investigated the correlation between shell thickness and photocatalytic activity. The Photocatalytic activities were evaluated from H2 formation on ethanol decomposition. It was found that the activities has maximum with specific Pd shell thickness, reaching the activity comparable to bulk one as increasing the shell thickness.