Cyclic voltammetry in 0.5 M H 2SO 4 was employed to determine the effect of the variation of the anodic limit scan and the potential range for the formation of hydroxylated species and metal oxides. The strain corrected Williamson−Hall models confirmed that nanoparticles have crystalline defects with a mean size of 2.8−2.9 nm. XRD confirmed that a Pt−Ru solid solution with a 41 at.% Ru is the main crystallographic phase in the electrocatalyst, whereas Pt and Ru oxides appear to be amorphous or very thin. In particular, the proton- and electron-conducting hydrous Ru oxide involved in the electrocatalytic oxidation of CO and methanol is detected. XPS spectra, however, indicate the existence of oxidized Pt and Ru species. TEM and its coupled techniques showed that polyoriented Pt−Ru nanoparticles present an average size of 3.0 ± 0.5 nm with nondetection of metal oxides. They were exhaustively determined by transmission electron microscopy (TEM), high-resolution TEM, fast Fourier transform, electron diffraction, X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) techniques. The structural properties of the nanoparticles of a high-performance commercial unsupported Pt−Ru electrocatalyst with a nominal equiatomic relationship have been studied.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |