UHV-EC studies of ultrathin Pd films on Pt(111): 2. Electrodeposition by potentiodynamic method
Abstract
Ultrathin Pd films of various coverages were potentiodynamically electrodeposited onto well-defined Pt(111) surfaces at a very slow scan rate of 0.1 mV/s. The ultrathin films were characterized using a combination of cyclic voltammetry, coulometry, low-energy electron diffraction and Auger electron spectroscopy. A Stranski-Krastanov growth mode was observed. Potentiodynamic electrodeposition afforded a 1-monolayer (ML) ultrathin film (ΘPd = 1 ML, where ΘPd ≡ ΓPd/ΓPt and Γ is the interfacial concentration) without the proliferation of steps sites, unlike the films prepared potentiostatically. Ultrathin films prepared by both methods share similar interfacial properties in the presence of chemisorbed bromine.
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