Sers investigation of interfacial Pb(II) species in weakly acidic aqueous halide media

José Coria-Garcia, Jeanne E. Pemberton, Raymond L. Sobocinski

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Surface-enhanced Raman scattering (SERS) has been used to study surface adsorbates at Ag electrodes from weakly acidic Cl-1 and Br-1 solutions containing Pb(II). Spectra in the low-frequency region (< 300 cm-1) indicate the presence of hydroxolead(II) complexes ionically bonded to specifically absorbed halide ions at the Ag surface. Studies of the effect of pH and halide ion concentration on the measured SERS intensities suggest that the surface precipitate has a composition in the ratio Pb(II):OH-1:X-1 of 1:1:1. The underpotential deposition of Pb quenches the intensities of these bands at different rates as a function of Pb coverage. These results suggest contributions from chemical effects in SERS of these systems. Additionally, a band at 110 cm-1 grows in intensity as the first Pb monolayer is deposited on the Ag surface in Cl-1 media. This vibration is tentatively assigned as Pb-Pb stretch.

Original languageEnglish (US)
Pages (from-to)291-309
Number of pages19
JournalJournal of Electroanalytical Chemistry
Volume219
Issue number1-2
DOIs
StatePublished - Mar 10 1987

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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