skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Temperature dependence of CO chemisorption and its oxidative desorption on the Pt(111) electrode

Abstract

The influence of temperature variation on the CO{sub chem} oxidative desorption on Pt(111) electrodes is examined. A distinct shift of the CO{sub chem} stripping peak towards less-positive potentials is observed as the temperature is increased from 273 to 333 K. Despite the displacement of the desorption peak towards lower potentials, its current density and shape remain unaffected (for T {le} 318 K), therefore indicating that the oxidation mechanism for the CO{sub chem} is not influenced by the temperature variation in this particular range. On the other hand, the coverage of the CO{sub chem} overlayer is clearly influenced by the temperature change. At T {le} 318 K, the CO{sub chem} coverage is 0.68 while at T > 318 K there is a sharp decrease in the CO{sub chem} coverage to 0.54. The linear dependence of the peak potential with the temperature allows the authors to determine the apparent activation energy of the process which is found t be 132 {+-} 3 kJ/mol. This value agrees well with the literature value that proposes that process proceeds with formation of (Pt-Co{hor_ellipsis}OH-Pt) as the activated complex.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Univ. de Alicante (ES)
OSTI Identifier:
20080283
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 16; Journal Issue: 11; Other Information: PBD: 30 May 2000; Journal ID: ISSN 0743-7463
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHEMISORPTION; TEMPERATURE DEPENDENCE; PLATINUM; ELECTRODES; DESORPTION; OXIDATION

Citation Formats

Herrero, E., Feliu, J.M., Blais, S., Radovic-Hrapovic, Z., and Jerkiewicz, G. Temperature dependence of CO chemisorption and its oxidative desorption on the Pt(111) electrode. United States: N. p., 2000. Web. doi:10.1021/la9907432.
Herrero, E., Feliu, J.M., Blais, S., Radovic-Hrapovic, Z., & Jerkiewicz, G. Temperature dependence of CO chemisorption and its oxidative desorption on the Pt(111) electrode. United States. doi:10.1021/la9907432.
Herrero, E., Feliu, J.M., Blais, S., Radovic-Hrapovic, Z., and Jerkiewicz, G. Tue . "Temperature dependence of CO chemisorption and its oxidative desorption on the Pt(111) electrode". United States. doi:10.1021/la9907432.
@article{osti_20080283,
title = {Temperature dependence of CO chemisorption and its oxidative desorption on the Pt(111) electrode},
author = {Herrero, E. and Feliu, J.M. and Blais, S. and Radovic-Hrapovic, Z. and Jerkiewicz, G.},
abstractNote = {The influence of temperature variation on the CO{sub chem} oxidative desorption on Pt(111) electrodes is examined. A distinct shift of the CO{sub chem} stripping peak towards less-positive potentials is observed as the temperature is increased from 273 to 333 K. Despite the displacement of the desorption peak towards lower potentials, its current density and shape remain unaffected (for T {le} 318 K), therefore indicating that the oxidation mechanism for the CO{sub chem} is not influenced by the temperature variation in this particular range. On the other hand, the coverage of the CO{sub chem} overlayer is clearly influenced by the temperature change. At T {le} 318 K, the CO{sub chem} coverage is 0.68 while at T > 318 K there is a sharp decrease in the CO{sub chem} coverage to 0.54. The linear dependence of the peak potential with the temperature allows the authors to determine the apparent activation energy of the process which is found t be 132 {+-} 3 kJ/mol. This value agrees well with the literature value that proposes that process proceeds with formation of (Pt-Co{hor_ellipsis}OH-Pt) as the activated complex.},
doi = {10.1021/la9907432},
journal = {Langmuir},
issn = {0743-7463},
number = 11,
volume = 16,
place = {United States},
year = {2000},
month = {5}
}