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

Published online by Cambridge University Press:  14 March 2012

Satoru Kageyama ,
Akio Murakami ,
Satoshi Ichikawa ,
Satoshi Seino ,
Takashi Nakagawa ,
Hideo Daimon ,
Yuji Ohkubo ,
Junichiro Kugai  and
Takao A. Yamamoto
Satoru Kageyama*
Affiliation:
Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
Akio Murakami
Affiliation:
Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
Satoshi Ichikawa
Affiliation:
Institute for NanoScience Design, Osaka University, Osaka 560-8531, Japan
Satoshi Seino
Affiliation:
Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
Takashi Nakagawa
Affiliation:
Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
Hideo Daimon
Affiliation:
Hitachi Maxell, Ltd., Osaka 567-8567, Japan
Yuji Ohkubo
Affiliation:
Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
Junichiro Kugai
Affiliation:
Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
Takao A. Yamamoto
Affiliation:
Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
*
a)Address all correspondence to this author. e-mail: s-kageyama@mit.eng.osaka-u.ac.jp
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Abstract

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.

Keywords

CatalyticAuTransmission electron microscopy
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 7 , 14 April 2012 , pp. 1037 - 1045
Copyright
Copyright © Materials Research Society 2012

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