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Characterization of graphite‐supported platinum catalysts by electrochemical methods and XPS
Author(s) -
De Bruijn F. A.,
Marin G. B.,
Niemantsverdriet J. W.,
Visscher W. H. M.,
Van Veen J. A. R.
Publication year - 1992
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.7401901100
Subject(s) - platinum , cyclic voltammetry , x ray photoelectron spectroscopy , catalysis , graphite , electrochemistry , chemistry , inorganic chemistry , voltammetry , oxygen , aqueous solution , chemical engineering , electrode , organic chemistry , engineering
X‐ray photoelectron spectroscopy and cyclic voltammetry have been used to characterize 4.9 wt.% platinum‐on‐graphite catalysts used for the oxidation with molecular oxygen of methyl α‐ D ‐glucoside in aqueous solution. Cyclic voltammetry indicates that a surface oxidic layer is formed on the platinum particles upon exposure to ambient air. This oxidation could not be confirmed by XPS, however. The oxidation of methyl α‐ D ‐glucoside in the liquid phase is accompanied by growth of the platinum particles. Open‐circuit potential measurements indicated an increasing oxygen coverage of the platinum surface during reaction.