An in-situ X-ray diffraction study on the electrochemical formation of PtZn alloys on Pt(111) single crystal electrode

作者：Drnec J^*; Bizzotto D; Carla F; Fiala R; Sode A; Balmes O; Detlefs B; Dufrane T; Felici R

来源：Applied Surface Science, 2015, 354: 443-449.

DOI：10.1016/j.apsusc.2015.04.072

• Pt
• Zn
• Alloy
• XRD
• XRR
• Electrochemistry

The electrochemical formation and dissolution of the oxygen reduction reaction (ORR) PtZn catalyst on Pt(1 1 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 vertical bar 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.

• 出版日期2015-11-1