Characterization of Pt-Ru/C catalysts by X-ray absorption spectroscopy and temperature-programmed surface reaction

Two commercial Pt-Ru/C catalysts possess bimetallic nanoparticles of similar structure with a Pt-rich core and a Ru-rich shell. However, the percentages of the surface Pt atoms on these two catalysts are slightly different as revealed by X-ray absorption spectroscopy and temperature-programmed surface reaction. Radial distribution functions clearly demonstrate the local atomic structures around Pt and Ru atoms on both samples.