In Situ  Anomalous Small‐Angle X‐ray Scattering Investigation of Carbon‐Supported Electrocatalysts | Zendy

Haubold H.G. | Zendy; Wang X. H. | Zendy; Goerigk G. | Zendy; Schilling W. | Zendy

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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.

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