Structure and Composition of Pt(111) and Pt(100) Surfaces as a Function of Electrode Potential in Aqueous Sulfide Solutions

Nikola Batina, James W. Mccargar, Ghaleb N. Salaita, Frank Lu, Laarni Laguren-davidsor, Chiu hsun Lin, Arthur T. Hubbard

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Studies are reported in which surface layers formed by immersion of well-defined Pt(lll) and Pt(100) electrode surfaces into aqueous Na2S solutions were characterized with regard to structure, composition, and reactivity by means of low-energy electron diffraction (LEED), Auger electron spectroscopy, electron energy-loss spectroscopy (EELS), linear scan voltammetry, and coulometry. Voltammetry reveals that only oxidative desorption of S occurs on the Pt surfaces; no S reductive desorption is observed over the useful potential range. Combined surface analysis data (Auger), vibrational spectra (EELS), and structural data (LEED) permit identification of adsorbed layer composition and structure on the Pt(lll) and Pt(100) surfaces as a function of potential. At potentials between -0.6 and 0.0 V (vs Ag/AgCl), LEED reveals that stable ordered adsorbed sulfur layers are formed on both surfaces: Pt(lll)(✓3X✓3)R30o-S and Pt-(100)(✓2X✓v2)R45°-S. The best clarity of the LEED patterns is found at pH 9. Potentials more positive than 0.0 V give rise to increasingly diffuse intensity related to oxidative desorption of S. Voltammograms for oxidative desorption of S from both surfaces are markedly different, indicating different mechanisms of S oxidation at the two surfaces: at pH 9, four voltammetric peaks are present for S at the Pt(111) surface, compared with only one peak for the Pt(100) surface. Coulometric data reveal that approximately six electrons are transferred in oxidation of adsorbed S at both surfaces at pH less than 10. Voltammetric behavior of the sulfur layer is sharply dependent upon pH.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalLangmuir
Volume5
Issue number1
DOIs
Publication statusPublished - 1989 Jan 1

Fingerprint

Sulfides
sulfides
Electrodes
electrodes
Chemical analysis
Low energy electron diffraction
Desorption
electron diffraction
desorption
Electron energy loss spectroscopy
Voltammetry
Sulfur
sulfur
energy dissipation
coulometry
Coulometers
electron energy
Oxidation
oxidation
clarity

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Batina, N., Mccargar, J. W., Salaita, G. N., Lu, F., Laguren-davidsor, L., Lin, C. H., & Hubbard, A. T. (1989). Structure and Composition of Pt(111) and Pt(100) Surfaces as a Function of Electrode Potential in Aqueous Sulfide Solutions. Langmuir, 5(1), 123-128. https://doi.org/10.1021/la00085a022
Batina, Nikola ; Mccargar, James W. ; Salaita, Ghaleb N. ; Lu, Frank ; Laguren-davidsor, Laarni ; Lin, Chiu hsun ; Hubbard, Arthur T. / Structure and Composition of Pt(111) and Pt(100) Surfaces as a Function of Electrode Potential in Aqueous Sulfide Solutions. In: Langmuir. 1989 ; Vol. 5, No. 1. pp. 123-128.
@article{a81bae9c128643e78362b78d15eab6f5,
title = "Structure and Composition of Pt(111) and Pt(100) Surfaces as a Function of Electrode Potential in Aqueous Sulfide Solutions",
abstract = "Studies are reported in which surface layers formed by immersion of well-defined Pt(lll) and Pt(100) electrode surfaces into aqueous Na2S solutions were characterized with regard to structure, composition, and reactivity by means of low-energy electron diffraction (LEED), Auger electron spectroscopy, electron energy-loss spectroscopy (EELS), linear scan voltammetry, and coulometry. Voltammetry reveals that only oxidative desorption of S occurs on the Pt surfaces; no S reductive desorption is observed over the useful potential range. Combined surface analysis data (Auger), vibrational spectra (EELS), and structural data (LEED) permit identification of adsorbed layer composition and structure on the Pt(lll) and Pt(100) surfaces as a function of potential. At potentials between -0.6 and 0.0 V (vs Ag/AgCl), LEED reveals that stable ordered adsorbed sulfur layers are formed on both surfaces: Pt(lll)(✓3X✓3)R30o-S and Pt-(100)(✓2X✓v2)R45°-S. The best clarity of the LEED patterns is found at pH 9. Potentials more positive than 0.0 V give rise to increasingly diffuse intensity related to oxidative desorption of S. Voltammograms for oxidative desorption of S from both surfaces are markedly different, indicating different mechanisms of S oxidation at the two surfaces: at pH 9, four voltammetric peaks are present for S at the Pt(111) surface, compared with only one peak for the Pt(100) surface. Coulometric data reveal that approximately six electrons are transferred in oxidation of adsorbed S at both surfaces at pH less than 10. Voltammetric behavior of the sulfur layer is sharply dependent upon pH.",
author = "Nikola Batina and Mccargar, {James W.} and Salaita, {Ghaleb N.} and Frank Lu and Laarni Laguren-davidsor and Lin, {Chiu hsun} and Hubbard, {Arthur T.}",
year = "1989",
month = "1",
day = "1",
doi = "10.1021/la00085a022",
language = "English",
volume = "5",
pages = "123--128",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "1",

}

Batina, N, Mccargar, JW, Salaita, GN, Lu, F, Laguren-davidsor, L, Lin, CH & Hubbard, AT 1989, 'Structure and Composition of Pt(111) and Pt(100) Surfaces as a Function of Electrode Potential in Aqueous Sulfide Solutions', Langmuir, vol. 5, no. 1, pp. 123-128. https://doi.org/10.1021/la00085a022

Structure and Composition of Pt(111) and Pt(100) Surfaces as a Function of Electrode Potential in Aqueous Sulfide Solutions. / Batina, Nikola; Mccargar, James W.; Salaita, Ghaleb N.; Lu, Frank; Laguren-davidsor, Laarni; Lin, Chiu hsun; Hubbard, Arthur T.

In: Langmuir, Vol. 5, No. 1, 01.01.1989, p. 123-128.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Structure and Composition of Pt(111) and Pt(100) Surfaces as a Function of Electrode Potential in Aqueous Sulfide Solutions

AU - Batina, Nikola

AU - Mccargar, James W.

AU - Salaita, Ghaleb N.

AU - Lu, Frank

AU - Laguren-davidsor, Laarni

AU - Lin, Chiu hsun

AU - Hubbard, Arthur T.

PY - 1989/1/1

Y1 - 1989/1/1

N2 - Studies are reported in which surface layers formed by immersion of well-defined Pt(lll) and Pt(100) electrode surfaces into aqueous Na2S solutions were characterized with regard to structure, composition, and reactivity by means of low-energy electron diffraction (LEED), Auger electron spectroscopy, electron energy-loss spectroscopy (EELS), linear scan voltammetry, and coulometry. Voltammetry reveals that only oxidative desorption of S occurs on the Pt surfaces; no S reductive desorption is observed over the useful potential range. Combined surface analysis data (Auger), vibrational spectra (EELS), and structural data (LEED) permit identification of adsorbed layer composition and structure on the Pt(lll) and Pt(100) surfaces as a function of potential. At potentials between -0.6 and 0.0 V (vs Ag/AgCl), LEED reveals that stable ordered adsorbed sulfur layers are formed on both surfaces: Pt(lll)(✓3X✓3)R30o-S and Pt-(100)(✓2X✓v2)R45°-S. The best clarity of the LEED patterns is found at pH 9. Potentials more positive than 0.0 V give rise to increasingly diffuse intensity related to oxidative desorption of S. Voltammograms for oxidative desorption of S from both surfaces are markedly different, indicating different mechanisms of S oxidation at the two surfaces: at pH 9, four voltammetric peaks are present for S at the Pt(111) surface, compared with only one peak for the Pt(100) surface. Coulometric data reveal that approximately six electrons are transferred in oxidation of adsorbed S at both surfaces at pH less than 10. Voltammetric behavior of the sulfur layer is sharply dependent upon pH.

AB - Studies are reported in which surface layers formed by immersion of well-defined Pt(lll) and Pt(100) electrode surfaces into aqueous Na2S solutions were characterized with regard to structure, composition, and reactivity by means of low-energy electron diffraction (LEED), Auger electron spectroscopy, electron energy-loss spectroscopy (EELS), linear scan voltammetry, and coulometry. Voltammetry reveals that only oxidative desorption of S occurs on the Pt surfaces; no S reductive desorption is observed over the useful potential range. Combined surface analysis data (Auger), vibrational spectra (EELS), and structural data (LEED) permit identification of adsorbed layer composition and structure on the Pt(lll) and Pt(100) surfaces as a function of potential. At potentials between -0.6 and 0.0 V (vs Ag/AgCl), LEED reveals that stable ordered adsorbed sulfur layers are formed on both surfaces: Pt(lll)(✓3X✓3)R30o-S and Pt-(100)(✓2X✓v2)R45°-S. The best clarity of the LEED patterns is found at pH 9. Potentials more positive than 0.0 V give rise to increasingly diffuse intensity related to oxidative desorption of S. Voltammograms for oxidative desorption of S from both surfaces are markedly different, indicating different mechanisms of S oxidation at the two surfaces: at pH 9, four voltammetric peaks are present for S at the Pt(111) surface, compared with only one peak for the Pt(100) surface. Coulometric data reveal that approximately six electrons are transferred in oxidation of adsorbed S at both surfaces at pH less than 10. Voltammetric behavior of the sulfur layer is sharply dependent upon pH.

UR - http://www.scopus.com/inward/record.url?scp=0042113297&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0042113297&partnerID=8YFLogxK

U2 - 10.1021/la00085a022

DO - 10.1021/la00085a022

M3 - Article

AN - SCOPUS:0042113297

VL - 5

SP - 123

EP - 128

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 1

ER -