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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.
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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

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