Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-28T11:50:28.568Z Has data issue: false hasContentIssue false
  • English
  • Français

Growth Characteristics of Self-Assembled Mesoporous Nanospheres of Platinum and Platinum-Ruthenium

Published online by Cambridge University Press:  15 February 2011

Trevor L. Knutson ,
Kimberly A. Haglund  and
William H. Smyrl
Trevor L. Knutson
Affiliation:
Corrosion Research Center Chemical Engineering and Materials Science, University of Minnesota Minneapolis, MN, 55422, U.S.A.
Kimberly A. Haglund
Affiliation:
Corrosion Research Center Chemical Engineering and Materials Science, University of Minnesota Minneapolis, MN, 55422, U.S.A.
William H. Smyrl
Affiliation:
Corrosion Research Center Chemical Engineering and Materials Science, University of Minnesota Minneapolis, MN, 55422, U.S.A.
Get access

Abstract

Self assembled spheres of both Pt and Pt/Ru have been electrodeposited in a matrix of carbon black on a gold electrode. The spheres are roughly 200nm in diameter and have a high degree of surface porosity. As a fuel cell catalyst, the activity of the Pt/Ru toward methanol oxidation is the primary indication of performance. Catalysts deposited in the current limiting regime (i.e. low metal ion concentrations or more negative deposition potentials) show markedly higher oxidation current at 4.8-5.5mA as measured at +0.2V vs. saturated calomel electrode. Pt only deposits were also made and show identical morphology to Pt/Ru deposits. Surface area analysis of the Pt deposits correlate well with the oxidation activity of the Pt/Ru deposits, at similar deposition conditions. The maximum specific surface area measured for Pt, based on 100% coulombic efficiency, was about 35m2/g.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 876: Symposium A – Nanoporous and Nanostructured Materials for Catalysis, Sensor and Gas Separation Applications , 2005 , R12.7
Copyright
Copyright © Materials Research Society 2005

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Petrii, O. A., Doklady Akademii Nauk SSSR 160 (4), 871–874 (1965).Google Scholar
2. Adlhart, O. J., Proc. Ann. Power Sources Conf. 19, 1–3 (1965).Google Scholar
3. Liu, Z. et al. , Journal of Materials Chemistry 13 (12), 3049–3052 (2003).Google Scholar
4. Liu, Z. et al. , Journal of Materials Chemistry 12 (8), 2453–2458 (2003).Google Scholar
5. Yu, W. et al. , Langmuir 15 (1), 6–9 (1999).Google Scholar
6. Okitsu, K. et al. , Chemistry of Materials 12 (10), 3006–3011 (2000).Google Scholar
7. Kim, J. Y. et al. , Journal of the Electrochemical Society 150 (11), A1421–A1431 (2003)Google Scholar
8. Liang, H.-P. et al. , Angew. Chem. Int. Ed. 43 (12), 1540–1543 (2004)Google Scholar
9. Jiang, J. and Kucernak, A., Chemistry of Materials 16 (7), 1362–1367 (2004)Google Scholar
10. Sogaard, M. et al. , Solid State Ionics 145 (1-4), 31–35 (2001)Google Scholar