Ex Situ Low-Energy Electron Diffraction and Auger Electron Spectroscopy and Electrochemical Studies of the Underpotential Deposition of Lead on Cu(100) and Cu(111)

Gessie M. Brisard, Entissar Zenati, Hubert A. Gasteiger, Nenad M. Marković, Philip N. Ross

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Abstract

The underpotential deposition of Pb was studied on Cu(100) and Cu(111) single crystal surfaces prepared both by sputtering/annealing in ultrahigh vacuum and by a novel electropolishing procedure. Identical results were found with both methods. A rotating ring disk assembly is used for the unambiguous determination of the lead adsorption isotherm on both Cu(100) and (111). The LEED pattern after emersion experiments shows that Pb atoms are deposited underpotentially on Cu(111) into a compact non-rotated hexagonal overlayer while on Cu(100) Pb UPD deposits form a (√2×√2)R45°. The presence of Cl- in the supporting electrolyte has a strong effect on the potential region where deposition/stripping of Pb occurs and on the reversibility of the reaction.

Original languageEnglish
Pages (from-to)142-155
Number of pages14
JournalACS Symposium Series
Volume656
StatePublished - 1997
Externally publishedYes

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