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Title: In situ real-time Pt L{sub III}-edge X-ray absorption spectra of carbon monoxide adsorbed on platinum particles dispersed in high-area carbon in aqueous electrolytes

Abstract

Changes in the Pt L{sub III}-edge region of small Pt particles (4 to 5 nm diam) dispersed in a high-area carbon (XC72-R) induced by the adsorption of CO, were monitored in situ in aqueous 0.1 M HClO{sub 4} by measuring the fluorescence intensity at fixed x-ray energies during a voltammetric cycle. This real-time technique made it possible to detect a small increase in the normalized fluorescence (< 0.1) at the Pt L{sub III} main absorption edge (11,564 eV), following electro-oxidation of CO adsorbed at saturation coverages on the high-area Pt, derived from a shift in the edge toward lower energies. These in situ findings are in agreement with ex situ spectroscopic measurements of Pt surface core levels for CO adsorbed on Pt single crystals in ultrahigh-vacuum environments. Also described in this work are applications of this new in situ technique to the study of hydrogen adsorption-desorption and oxide formation and reduction on such high-area Pt/XC72-R electrodes in the same electrolyte. In situ Pt L{sub III}-edge studies of high-area Pt/high-area carbon electrodes in a fuel cell environment could, in principle, provide very valuable fundamental information of direct relevance to technological applications.

Authors:
;  [1]
  1. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Chemistry
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
599647
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 145; Journal Issue: 1; Other Information: PBD: Jan 1998
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; PLATINUM; MORPHOLOGICAL CHANGES; FUEL CELLS; CARBON DIOXIDE; ADSORPTION; CARBON; ABSORPTION SPECTRA; ELECTRODES; FLUORESCENCE

Citation Formats

Bae, I T, and Scherson, D A. In situ real-time Pt L{sub III}-edge X-ray absorption spectra of carbon monoxide adsorbed on platinum particles dispersed in high-area carbon in aqueous electrolytes. United States: N. p., 1998. Web. doi:10.1149/1.1838215.
Bae, I T, & Scherson, D A. In situ real-time Pt L{sub III}-edge X-ray absorption spectra of carbon monoxide adsorbed on platinum particles dispersed in high-area carbon in aqueous electrolytes. United States. https://doi.org/10.1149/1.1838215
Bae, I T, and Scherson, D A. Thu . "In situ real-time Pt L{sub III}-edge X-ray absorption spectra of carbon monoxide adsorbed on platinum particles dispersed in high-area carbon in aqueous electrolytes". United States. https://doi.org/10.1149/1.1838215.
@article{osti_599647,
title = {In situ real-time Pt L{sub III}-edge X-ray absorption spectra of carbon monoxide adsorbed on platinum particles dispersed in high-area carbon in aqueous electrolytes},
author = {Bae, I T and Scherson, D A},
abstractNote = {Changes in the Pt L{sub III}-edge region of small Pt particles (4 to 5 nm diam) dispersed in a high-area carbon (XC72-R) induced by the adsorption of CO, were monitored in situ in aqueous 0.1 M HClO{sub 4} by measuring the fluorescence intensity at fixed x-ray energies during a voltammetric cycle. This real-time technique made it possible to detect a small increase in the normalized fluorescence (< 0.1) at the Pt L{sub III} main absorption edge (11,564 eV), following electro-oxidation of CO adsorbed at saturation coverages on the high-area Pt, derived from a shift in the edge toward lower energies. These in situ findings are in agreement with ex situ spectroscopic measurements of Pt surface core levels for CO adsorbed on Pt single crystals in ultrahigh-vacuum environments. Also described in this work are applications of this new in situ technique to the study of hydrogen adsorption-desorption and oxide formation and reduction on such high-area Pt/XC72-R electrodes in the same electrolyte. In situ Pt L{sub III}-edge studies of high-area Pt/high-area carbon electrodes in a fuel cell environment could, in principle, provide very valuable fundamental information of direct relevance to technological applications.},
doi = {10.1149/1.1838215},
url = {https://www.osti.gov/biblio/599647}, journal = {Journal of the Electrochemical Society},
number = 1,
volume = 145,
place = {United States},
year = {1998},
month = {1}
}