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In Situ Anomalous Small‐Angle X‐ray Scattering Investigation of Carbon‐Supported Electrocatalysts
Author(s) -
Haubold H.G.,
Wang X. H.,
Goerigk G.,
Schilling W.
Publication year - 1997
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889897002422
Subject(s) - materials science , platinum , scattering , particle size , synchrotron radiation , electrochemistry , electrolyte , sulfuric acid , catalysis , small angle x ray scattering , synchrotron , carbon fibers , small angle scattering , electrode , analytical chemistry (journal) , oxide , particle (ecology) , chemistry , optics , composite material , metallurgy , biochemistry , physics , oceanography , chromatography , composite number , geology
Anomalous small‐angle X‐ray scattering (ASAXS) of synchrotron radiation with X‐ray energies near the Pt‐ L 3 X‐ray absorption edge was used to examine the size distribution of nanometer‐sized catalyst particles in porous electrodes for electrocatalytic applications. Carbon‐supported platinum electrocatalysts with 5–80 wt% Pt were studied in situ in an electrochemical cell with a 1 M sulfuric acid electrolyte. The anodic oxidation was found to shift the particle size distribution from a mean size of 1.7 nm in the reduced state to 2.1 nm for a 10 wt% Pt/C catalyst. From the size increase, one can infer the formation of oxide shells at the particle surfaces with layer thicknesses of about 1 nm.