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Effect of ultrasonic irradiation on carbon-supported Pt-Ru nanoparticles prepared at high metal concentration

被引：28
作者：
Nagao, Daisuke
Shimazaki, Yuzuru
Saeki, Shu
Kobayashi, Yoshio
Konno, Mikio
机构：
[1] Tohoku Univ, Grad Sch Engn, Dept Chem Engn, Sendai, Miyagi 9808579, Japan
[2] Tohoku Technoarch, Sendai, Miyagi 9808579, Japan
[3] Hitachi Ltd, Hitachi Res Lab, Hitachi, Ibaraki 3191292, Japan
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2007年 / 302卷 / 1-3期
关键词：
nanoparticle; ultrasound; Pt-Ru; carbon-support; methanol oxidation current;
D O I：
10.1016/j.colsurfa.2007.02.022
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Effect of ultrasonic irradiation during the preparation of carbon-supported Pt-Ru nanoparticles was studied to obtain the aqueous dispersion of catalyst at higher concentrations. The nanoparticles formed through the reduction of Pt and Ru ions with sodium borohydride were impregnated on carbon powder (Vulcan XC72R). TEM observation revealed that the sample prepared with ultrasonic irradiation had single-nanometer-sized Pt-Ru particles on the carbon support, while aggregated Pt-Ru particles were observed in the non-irradiated sample. Methanol oxidation current for the catalysts prepared under ultrasonic irradiation was higher than that for the catalysts prepared without irradiation. This promotive effect of ultrasonic irradiation on the catalytic activity was also confirmed at concentrations of Pt, Ru and carbon support as high as 3.0 mM, 1.2 mM, and 1065 mg/l, respectively. (C) 2007 Elsevier B.V. All rights reserved.
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收藏
页码：623 / 627
页数：5
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