X-ray photoelectron spectroscopic studies of palladium oxides and the palladium-oxygen electrode

K. S. Kim; A. F. Gossmann; Nicholas Winograd

doi:10.1021/ac60338a037

X-ray photoelectron spectroscopic studies of palladium oxides and the palladium-oxygen electrode

K. S. Kim, A. F. Gossmann, Nicholas Winograd

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Abstract

The ESCA technique has been employed to characterize various palladium-oxygen species on the surface of oxidized palladium metal. Both oxygen-chemisorbed palladium atoms (PdO_ads) and PdO are observed on metal substrates exposed to air at 600 to 900 °C. These results have been applied to studying electrochemically oxidized palladium electrodes in 1N H₂SO₄. Both PdO and PdO₂ are observed at potentials beginning at +0.90 V vs. N.H.E. In addition, since the mean escape depth of the photoelectron is on the order of 10 Å, estimates of oxide film thicknesses can be made. Electrodes oxidized at 0.9 V had a coating about 5 Å thick whereas at 1.7 V, the thickness increased to greater than 40 Å. By examining the peak areas of the Pd spectra and the oxygen spectra, the presence of excess oxygen as adsorbed and H₂O, hydrated PdO, PdO₂, and Pd(OH)₂ or Pd(OH)₄ was clearly indicated.

Original language	English (US)
Pages (from-to)	197-200
Number of pages	4
Journal	Analytical chemistry
Volume	46
Issue number	2
DOIs	https://doi.org/10.1021/ac60338a037
State	Published - Feb 1 1974

All Science Journal Classification (ASJC) codes

Analytical Chemistry

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10.1021/ac60338a037

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@article{57b19ad2a76548d68452c559edc4d0ae,

title = "X-ray photoelectron spectroscopic studies of palladium oxides and the palladium-oxygen electrode",

abstract = "The ESCA technique has been employed to characterize various palladium-oxygen species on the surface of oxidized palladium metal. Both oxygen-chemisorbed palladium atoms (PdOads) and PdO are observed on metal substrates exposed to air at 600 to 900 °C. These results have been applied to studying electrochemically oxidized palladium electrodes in 1N H2SO4. Both PdO and PdO2 are observed at potentials beginning at +0.90 V vs. N.H.E. In addition, since the mean escape depth of the photoelectron is on the order of 10 {\AA}, estimates of oxide film thicknesses can be made. Electrodes oxidized at 0.9 V had a coating about 5 {\AA} thick whereas at 1.7 V, the thickness increased to greater than 40 {\AA}. By examining the peak areas of the Pd spectra and the oxygen spectra, the presence of excess oxygen as adsorbed and H2O, hydrated PdO, PdO2, and Pd(OH)2 or Pd(OH)4 was clearly indicated.",

author = "Kim, {K. S.} and Gossmann, {A. F.} and Nicholas Winograd",

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journal = "Analytical chemistry",

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T1 - X-ray photoelectron spectroscopic studies of palladium oxides and the palladium-oxygen electrode

AU - Kim, K. S.

AU - Gossmann, A. F.

AU - Winograd, Nicholas

PY - 1974/2/1

Y1 - 1974/2/1

N2 - The ESCA technique has been employed to characterize various palladium-oxygen species on the surface of oxidized palladium metal. Both oxygen-chemisorbed palladium atoms (PdOads) and PdO are observed on metal substrates exposed to air at 600 to 900 °C. These results have been applied to studying electrochemically oxidized palladium electrodes in 1N H2SO4. Both PdO and PdO2 are observed at potentials beginning at +0.90 V vs. N.H.E. In addition, since the mean escape depth of the photoelectron is on the order of 10 Å, estimates of oxide film thicknesses can be made. Electrodes oxidized at 0.9 V had a coating about 5 Å thick whereas at 1.7 V, the thickness increased to greater than 40 Å. By examining the peak areas of the Pd spectra and the oxygen spectra, the presence of excess oxygen as adsorbed and H2O, hydrated PdO, PdO2, and Pd(OH)2 or Pd(OH)4 was clearly indicated.

AB - The ESCA technique has been employed to characterize various palladium-oxygen species on the surface of oxidized palladium metal. Both oxygen-chemisorbed palladium atoms (PdOads) and PdO are observed on metal substrates exposed to air at 600 to 900 °C. These results have been applied to studying electrochemically oxidized palladium electrodes in 1N H2SO4. Both PdO and PdO2 are observed at potentials beginning at +0.90 V vs. N.H.E. In addition, since the mean escape depth of the photoelectron is on the order of 10 Å, estimates of oxide film thicknesses can be made. Electrodes oxidized at 0.9 V had a coating about 5 Å thick whereas at 1.7 V, the thickness increased to greater than 40 Å. By examining the peak areas of the Pd spectra and the oxygen spectra, the presence of excess oxygen as adsorbed and H2O, hydrated PdO, PdO2, and Pd(OH)2 or Pd(OH)4 was clearly indicated.

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JO - Analytical chemistry

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IS - 2

ER -

X-ray photoelectron spectroscopic studies of palladium oxides and the palladium-oxygen electrode

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