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Structure and Composition of Supported Pt-Sn Electrocatalysts

Published online by Cambridge University Press:  02 July 2020

V. Radmilovic ,
T. Richardson ,
SJ. Chen  and
P.N. Ross
V. Radmilovic
Affiliation:
National Center for Electron Microscopy, LBNL, University of California, Berkeley, CA, USA
T. Richardson
Affiliation:
CSD and MSD, LBNLaboratory, Berkeley, CA94720, University of California.
SJ. Chen
Affiliation:
National Center for Electron Microscopy, LBNL, University of California, Berkeley, CA, USA
P.N. Ross
Affiliation:
CSD and MSD, LBNLaboratory, Berkeley, CA94720, University of California.
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Extract

Bimetallic alloy particles supported on high-surface area carbon are widely used as electrode materials. Because of their stability, Pt-Sn alloys are of particulate interest for a variety of applications. Although the reasons for the superior properties of these catalysts are not fully understood, the dispersion, structure, and compositional homogeneity of the alloy clusters, are clearly important factors in determining their catalytic activity. In order to identify the composition and structure of Pt-Sn base nanoparticles, various characterization techniques, mainly X-ray diffraction (XRD) and transmission electron microscopy (TEM) [1], have been applied. However, very often conflicting conclusions regarding to the structure of Pt-Sn particles have been reported. The focus of the present work is to examine a commercially available carbon supported bimetallic Pt-Sn catalyst, with a nominal Pt:Sn wt. ratio of 2:1 (500N and 900N samples) and 3:1 (E270 sample), using high resolution electron microscopy (HREM), electron and X-ray diffraction techniques, and microchemical analysis by energy dispersive X-ray spectroscopy (EDS).

Type
A. Howie Symposium: Celebration of Pioneering Electron Microscopy
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 702 - 703
Copyright
Copyright © Microscopy Society of America

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References

1.Srinivasan, R., Sharma, R., Su, S., and Davis, B.H., Catal., Today, 21 (1994) 83.CrossRefGoogle Scholar
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4. This work was supported by the Director, Office of Basic Energy Sciences, Materials Science Division, and the Office of Advanced Automotive Technologies, Fuel Cell Systems, US Department of Energy, under contract DE-AC3-76SF00098.Google Scholar