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

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

Research output: Contribution to journalArticle

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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 (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.

Original languageEnglish (US)
Pages (from-to)197-200
Number of pages4
JournalAnalytical chemistry
Volume46
Issue number2
DOIs
StatePublished - Feb 1 1974

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Palladium
Photoelectrons
Oxygen
X rays
Electrodes
Metals
Oxide films
Film thickness
Coatings
Atoms
palladium oxide
Substrates
Air

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

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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 (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.",
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X-ray photoelectron spectroscopic studies of palladium oxides and the palladium-oxygen electrode. / Kim, K. S.; Gossmann, A. F.; Winograd, Nicholas.

In: Analytical chemistry, Vol. 46, No. 2, 01.02.1974, p. 197-200.

Research output: Contribution to journalArticle

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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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