Growth characteristics of self-assembled mesoporous nanospheres of platinum and platinum-ruthenium

Trevor L. Knutson, Kimberly A. Haglund, William H. Smyrl

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationNanoporous and Nanostructured Materials for Catalysis, Sensor, and Gas Separation Applications
PublisherMaterials Research Society
Pages298-303
Number of pages6
ISBN (Print)1558998306, 9781558998308
DOIs
StatePublished - 2005
Event2005 MRS Spring Meeting - San Francisco, CA, United States
Duration: Mar 28 2005Apr 1 2005

Publication series

NameMaterials Research Society Symposium Proceedings
Volume876
ISSN (Print)0272-9172

Other

Other2005 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period3/28/054/1/05

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