Interfacial Structure and Chemistry of Potentiodynamically Electrodeposited Ultrathin Pd Films on Pt(111)

摘要

Ultrathin Pd films, with coverages from 0.5 monolayers (ML) to 8 ML, were prepared by potential-sweep deposition on well-defined Pt(111) surfaces. Analysis of the voltammetric peaks characteristic of hydrogen adsorption/desorption on Pd terrace and step sites revealed that, 1 ML coverage, the film remained step-free but, at higher coverages, formed 3D islands (Stranski-Krastanov growth mode). Corroborating evidences were provided by low-energy electron diffraction and Auger electron spectroscopy.