期刊
JOURNAL OF POWER SOURCES
卷 189, 期 2, 页码 909-915出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2008.12.109
关键词
Oxygen reduction catalysts; Non-Pt catalyst; Ultrasound; Methanol fuel cell; Alkaline media
资金
- Global COE Program Center for Practical Chemical Wisdom
- Encouraging Development Strategic Research Center's Program Establishment of Consolidated Research Center's Institute for Advanced Science and Medical Care
- Establishment of Electrochemical Device Engineering
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
Carbon-supported Pd-Sn (Pd-Sn/C) catalyst was prepared under ultrasonic irradiation, and its electrocatalytic activity for oxygen reduction reaction (ORR) was evaluated in 0.5M KOH. TEM images showed that the prepared Pd-Sn/C catalyst particles are smaller in average size than carbon-supported Pd (Pd/C) catalyst particles. XRD and XPS results indicated the small particle size and the electronic interaction between Pd and Sn for the Pd-Sn/C catalyst. The Pd-Sn/C catalyst has a higher ORR activity than the Pd/C catalyst in alkaline media. In addition, the Pd-Sn/C catalyst showed a lower Tafel slope and a larger number of electrons transferred for ORR, compared with those of the Pd/C catalyst. These results indicate that Sn influences both the kinetics and the mechanism of ORR. Based on these results, the Pd-Sn/C catalyst prepared by using ultrasonic irradiation can be expected as a promising ORR catalyst in alkaline media. (C) 2009 Elsevier B.V. All rights reserved.
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