Enhanced electrochemical stability of PtRuAu/C catalyst synthesized by radiolytic process

A nanoparticle catalyst of PtRuAu/C was synthesized by including an Au precursor in the radiolytic process for preparing a PtRu/C catalyst. Their methanol oxidation activity and electrochemical durability were measured by linear sweep voltammetry before and after potential cycling treatment. PtRuAu/...

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Bibliographic Details
Published in:Journal of materials research 2012-04, Vol.27 (7), p.1037-1045
Main Authors: Kageyama, Satoru, Murakami, Akio, Ichikawa, Satoshi, Seino, Satoshi, Nakagawa, Takashi, Daimon, Hideo, Ohkubo, Yuji, Kugai, Junichiro, Yamamoto, Takao A.
Format: Article
Language:English
Subjects:
Analysis
Applied and Technical Physics
Biomaterials
Carbon
Catalysis
Catalysts
Chemical reactions
Electronics
Electrons
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Morphology
Nanoparticles
Nanotechnology
Oxidation
Radiation
Raw materials
Spectrum analysis
Stability
Studies
Voltammetry
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Summary:A nanoparticle catalyst of PtRuAu/C was synthesized by including an Au precursor in the radiolytic process for preparing a PtRu/C catalyst. Their methanol oxidation activity and electrochemical durability were measured by linear sweep voltammetry before and after potential cycling treatment. PtRuAu/C had a significantly higher durability than PtRu/C while maintaining a comparable high activity. The morphology and substructure of the nanoparticles were investigated by energy-dispersive x-ray spectroscopy, x-ray diffraction, and x-ray absorption fine structure spectroscopy. Metallic nanoparticles with diameters of about 2 nm were obtained; they probably had Pt-core/PtRu-shell structures. Transmission electron microscopy observations after potential cycling revealed that 2-nm-diameter nanoparticles containing Au did not coarsen, whereas nanoparticles without Au coarsened significantly to 3.7 nm. Some crystal defaults were observed in the coarsened particles, implying that the coarsening was caused by Ostwald ripening. The Au addition to catalyst particles consisting of PtRu inhibits coarsening and consequently improves the electrochemical durability.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2012.65