Effect of PtRu alloying degree on electrocatalytic activities and stabilities

Title
Effect of PtRu alloying degree on electrocatalytic activities and stabilities
Authors
이국승전태열유성종박인수조용훈강순형최광현성영은
Keywords
메탄올 직접 연료전지; PtRu 합금; stability; Electrochemical stability; Alloying degree; Direct methanol fuel cell; XPS element mapping; Bifunctional mechanism
Issue Date
2011-02
Publisher
Applied catalysis B, Environmental
Citation
VOL 102, NO 1-2, 334-342
Abstract
The PtRu alloying degree was controlled by mixing various amounts of water in the solvent while the nominal Pt/Ru ratio was remained at the value of one, and the relationship between the alloying degree and electrochemical activities was examined in this study. X-ray diffraction analysis showed that the fraction of the alloyed Ru ranged from approximately 18% for 100% water solvent to 86% for 0% water solvent. In X-ray photoelectron spectroscopy (XPS), Pt and Ru metallic components increased with the PtRu alloying degree. Electrochemical activities for CO oxidation and methanol oxidation were enhanced as the PtRu alloying degree became higher. Electrochemical stability was also investigated via potential cycling in a methanol-contained electrolyte solution. After the potential cycling process, the catalysts were analyzed by transmission electron microscopy, XPS, XPS element mapping. Possible reasons for the difference in the electrochemical stability of the catalysts were discussed.
URI
http://pubs.kist.re.kr/handle/201004/39330
ISSN
0926-3373
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KIST Publication > Article
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