Characterization of platinum electrodes by infrared spectroscopy

Jay B. Benziger; F. A. Pascal; S. L. Bernasek; M. P. Soriaga; A. T. Hubbard

doi:10.1016/0022-0728(86)90026-4

Characterization of platinum electrodes by infrared spectroscopy

Jay B. Benziger, F. A. Pascal, S. L. Bernasek, M. P. Soriaga, A. T. Hubbard

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Abstract

The surface of a Pt electrode has been examined as a function of applied potential with reflection-adsorption infrared spectroscopy and linear sweep voltammetry. In a 1 M HClO₄ solution, adsorbed hydronium was present on the surface at potentials less than 0 V vs. Ag/AgCl. Adsorbed hydronium reduced CO adsorption, and caused an upward shift in the CO stretching frequency. At potentials greater than 0.5 V, OH adsorbed on the surface. The hydroxyl groups blocked CO adsorption on the electrode surface. Anodic oxidation occurs at potentials above 1.2 V in 1 M HClO₄ with the formation of a partially hydrated platinum hydroxide surface layer. The thickness of the surface layer increased with increasing applied potential. Adsorption on the Pt electrode from 1 M NaOH solutions resembled that observed with acid solution. However, anodic oxidation of the Pt electrode in basic solution produced a surface film with less incorporated water than was observed in acid solution.

Original language	English (US)
Pages (from-to)	65-80
Number of pages	16
Journal	Journal of Electroanalytical Chemistry
Volume	198
Issue number	1
DOIs	https://doi.org/10.1016/0022-0728(86)90026-4
State	Published - Jan 24 1986

All Science Journal Classification (ASJC) codes

Analytical Chemistry
General Chemical Engineering
Electrochemistry

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title = "Characterization of platinum electrodes by infrared spectroscopy",

abstract = "The surface of a Pt electrode has been examined as a function of applied potential with reflection-adsorption infrared spectroscopy and linear sweep voltammetry. In a 1 M HClO4 solution, adsorbed hydronium was present on the surface at potentials less than 0 V vs. Ag/AgCl. Adsorbed hydronium reduced CO adsorption, and caused an upward shift in the CO stretching frequency. At potentials greater than 0.5 V, OH adsorbed on the surface. The hydroxyl groups blocked CO adsorption on the electrode surface. Anodic oxidation occurs at potentials above 1.2 V in 1 M HClO4 with the formation of a partially hydrated platinum hydroxide surface layer. The thickness of the surface layer increased with increasing applied potential. Adsorption on the Pt electrode from 1 M NaOH solutions resembled that observed with acid solution. However, anodic oxidation of the Pt electrode in basic solution produced a surface film with less incorporated water than was observed in acid solution.",

author = "Benziger, {Jay B.} and Pascal, {F. A.} and Bernasek, {S. L.} and Soriaga, {M. P.} and Hubbard, {A. T.}",

note = "Funding Information: This work was supported by the Air Force Office of Scientific Research under grant AFOSR 82-302, and by the Office of Naval Research under grant ONR-N00014-82-K-004.",

year = "1986",

month = jan,

day = "24",

doi = "10.1016/0022-0728(86)90026-4",

language = "English (US)",

volume = "198",

pages = "65--80",

journal = "Journal of Electroanalytical Chemistry",

issn = "0022-0728",

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T1 - Characterization of platinum electrodes by infrared spectroscopy

AU - Benziger, Jay B.

AU - Pascal, F. A.

AU - Bernasek, S. L.

AU - Soriaga, M. P.

AU - Hubbard, A. T.

N1 - Funding Information: This work was supported by the Air Force Office of Scientific Research under grant AFOSR 82-302, and by the Office of Naval Research under grant ONR-N00014-82-K-004.

PY - 1986/1/24

Y1 - 1986/1/24

N2 - The surface of a Pt electrode has been examined as a function of applied potential with reflection-adsorption infrared spectroscopy and linear sweep voltammetry. In a 1 M HClO4 solution, adsorbed hydronium was present on the surface at potentials less than 0 V vs. Ag/AgCl. Adsorbed hydronium reduced CO adsorption, and caused an upward shift in the CO stretching frequency. At potentials greater than 0.5 V, OH adsorbed on the surface. The hydroxyl groups blocked CO adsorption on the electrode surface. Anodic oxidation occurs at potentials above 1.2 V in 1 M HClO4 with the formation of a partially hydrated platinum hydroxide surface layer. The thickness of the surface layer increased with increasing applied potential. Adsorption on the Pt electrode from 1 M NaOH solutions resembled that observed with acid solution. However, anodic oxidation of the Pt electrode in basic solution produced a surface film with less incorporated water than was observed in acid solution.

AB - The surface of a Pt electrode has been examined as a function of applied potential with reflection-adsorption infrared spectroscopy and linear sweep voltammetry. In a 1 M HClO4 solution, adsorbed hydronium was present on the surface at potentials less than 0 V vs. Ag/AgCl. Adsorbed hydronium reduced CO adsorption, and caused an upward shift in the CO stretching frequency. At potentials greater than 0.5 V, OH adsorbed on the surface. The hydroxyl groups blocked CO adsorption on the electrode surface. Anodic oxidation occurs at potentials above 1.2 V in 1 M HClO4 with the formation of a partially hydrated platinum hydroxide surface layer. The thickness of the surface layer increased with increasing applied potential. Adsorption on the Pt electrode from 1 M NaOH solutions resembled that observed with acid solution. However, anodic oxidation of the Pt electrode in basic solution produced a surface film with less incorporated water than was observed in acid solution.

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EP - 80

JO - Journal of Electroanalytical Chemistry

JF - Journal of Electroanalytical Chemistry

IS - 1

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Characterization of platinum electrodes by infrared spectroscopy

Abstract

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