X-ray absorption study of platinum nanoparticles on an ion-irradiated carbon support.

Abstract The chemical state and local structure of 2.6-nm-sized platinum (Pt) nanoparticles on an ion-irradiated glassy carbon (GC) substrate were investigated by X-ray absorption fine structure measurements. The partial oxidation of the Pt nanoparticles was confirmed by the peak intensity in the near-edge region of the absorption spectrum. The analysis of the extended region revealed a higher coordination number and shorter bond length of Pt–Pt compared to those of the Pt nanoparticles on the non-ion-irradiated GC. Thus, Pt nanoparticles on the ion-irradiated GC substrate were found to hold a rigid metallic coordination during the oxidation. Highlights • Pt nanoparticles were deposited on a 380 keV Ar+-irradiated carbon support. • The partial oxidation of Pt was confirmed by XANES measurements. • Pt on the irradiated support held a rigid metallic coordination during oxidation. [ABSTRACT FROM AUTHOR]