In situ structural characterization of a platinum electrocatalyst by dispersive x-ray absorption spectroscopy

In situ structural characterization of a platinum electrocatalyst by dispersive x-ray absorption spectroscopy

Using in-situ dispersive EXAFS spectroscopy, we have monitored the numbers of PtO and PtPt bonds and the charge on the Pt in parallel with cyclic voltammetry on Pt clusters in a polymer electrolyte fuel cell. Due to the increased sensitivity of this method, we detect small structural changes not p...

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Veröffentlicht in:Electrochimica acta 1994-11, Vol.39 (16), p.2415-2418
Hauptverfasser: Allen, P.G., Conradson, S.D., Wilson, M.S., Gottesfeld, S., Raistrick, I.D., Valerio, J., Lovato, M.
Format: Artikel
Sprache:eng
Schlagworte:
Adsorption
Chemistry
dispersive EXAFS
electrocatalysts
Electrochemistry
Exact sciences and technology
General and physical chemistry
in situ EXAFS
PEM fuel cell
platinum
Study of interfaces
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Beschreibung
Zusammenfassung:Using in-situ dispersive EXAFS spectroscopy, we have monitored the numbers of PtO and PtPt bonds and the charge on the Pt in parallel with cyclic voltammetry on Pt clusters in a polymer electrolyte fuel cell. Due to the increased sensitivity of this method, we detect small structural changes not previously reported for these clusters and can correlate these changes with specific reactions, ie H desorption or O adsorption in the double-layer region.
ISSN:0013-4686
1873-3859
DOI:10.1016/0013-4686(94)E0196-U