Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5349125 | Applied Surface Science | 2015 | 7 Pages |
Abstract
The electrochemical formation and dissolution of the oxygen reduction reaction (ORR) PtZn catalyst on Pt(1Â 1Â 1) surface is followed by in-situ X-ray diffraction (XRD) and X-ray reflectivity (XRR) measurements. When the crystalline Pt surface is polarized to sufficiently negative potential values, with respect to an Ag/AgCl|KCl reference electrode, the electrodeposited zinc atoms diffuse into the bulk and characteristic features are observed in the X-ray patterns. The surface structure and composition during deposition and dissolution is determined from analysis of XRR curves and measurements of crystal truncation rods. Thin Zn-rich surface layer is present during the alloy formation while a Zn-depleted layer forms during dissolution.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
J. Drnec, D. Bizzotto, F. Carlà , R. Fiala, A. Sode, O. Balmes, B. Detlefs, T. Dufrane, R. Felici,