期刊
SCIENCE CHINA-CHEMISTRY
卷 55, 期 3, 页码 391-397出版社
SCIENCE PRESS
DOI: 10.1007/s11426-011-4485-6
关键词
platinum; palladium; cerium oxide; direct formic acid fuel cell
资金
- National Natural Science Foundation of China [20673040, 20876062]
- Ministry of Science and Technology of China [2009AA05Z119]
- Guangdong Provincial Scientific Foundation [36055]
PdPt bimetallic catalysts that employ CeO2-modified carbon black as a support have been prepared using an organic colloidal method. PdPt/CeO2-C shows excellent performance toward the anodic oxidation of formic acid. The effects of varying both Pd to Pt ratio and CeO2 content have been investigated. The optimal Pd to Pt atomic ratio is 15, indicating that addition of small amounts of Pt can significantly enhance the activity of the catalyst. When the CeO2 content in the catalyst reaches as high as similar to 15 wt.%, the catalyst shows the maximum activity. Adding CeO2 not only enhances the catalytic activity of the material, but may also change the mechanism of its catalysis of the anodic oxidation of formic acid. Pd15Pt1/15CeO(2)-C exhibited 60% higher activity than Pd/C, and had a negative shift in onset potential of more than 0.1 V. Based on characterization by X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetric analysis and transmission electron microscopy, the interactions between the components are revealed and discussed in detail.
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