Palladium Electrodeposition onto Pt(100): Two-Layer Underpotential Deposition

• DOI: 10.1021/acs.langmuir.6b03968
• Publication Date: 2017-02-14T01:28:59Z
• Authors: Bruno A. F. Previ...; Eric Sibert; Mireille Maret; Yvonne Soldo-Olivier
• Keywords: Underpotential deposition; Deposition

Electrodeposition of the first Pd layers onto Pt(100) was investigated using cyclic voltammetry at a low scan rate (0.1 mV·s-1). Ultrathin films were characterized by in 0.1 M H2SO4 solution and with ex situ AFM (atomic force microscopy). For time, we evidenced underpotential character deposition two layers, two-step mechanism, each step corresponding to complete atomic layer. thicker deposits, especially above 10 monolayers as equivalent thickness, electrochemical characterization displays strong irreversibility broadening adsorption/desorption peaks, associated reduction long-range ordered flat areas. Ex images are agreement this description. They show rough thick deposits growth (100)-oriented rectangular shaped islands their sides aligned [011] [0-11] perpendicular directions (100) Pt surface.