| Autor: |
Anderson AD; Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, USA., Deluga GA, Moore JT, Vergne MJ, Hercules DM, Kenik EA, Lukehart CM |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of nanoscience and nanotechnology [J Nanosci Nanotechnol] 2004 Sep; Vol. 4 (7), pp. 809-16. |
| DOI: |
10.1166/jnn.2004.085 |
| Abstrakt: |
Pt-Re/Vulcan carbon powder nanocomposites have been prepared with total metal loadings of 18 wt.% and 40 wt.% using a new non-cluster (1:1)-PtRe bimetallic precursor as the source of metal. Pt-Re nanoparticles having an average diameter of ca. 6 nm and atomic stoichiometry near 1:1 are formed. TEM, on-particle HR-EDS, and powder XRD data are consistent with the formation of Pt-Re alloy nanoparticles having a hexagonal unit cell with cell constants of a = 2.77 A and c = 4.47 A. A nanocomposite prepared at higher total metal loading under more rigorous thermal treatment also contains Pt-Re alloy nanoparticles having a fcc unit cell structure (a = 3.95 A). The precise dependence of Pt-Re nanocrystal structure on the thermal history of the nanocomposite specimen has not been investigated in detail. While these Pt-Re/carbon nanocomposites are active as anode catalysts in operating direct methanol fuel cells, the measured performance is less than that of commercial Pt-Ru/carbon catalysts and has marginal practical importance. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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