Accession Number:

ADA364465

Title:

Nanocomposite Materials Designed for Chemical Catalysis

Descriptive Note:

Final progress rept. 1 May 95-31 Dec 98

Corporate Author:

VANDERBILT UNIV NASHVILLE TN

Personal Author(s):

Report Date:

1999-03-29

Pagination or Media Count:

13.0

Abstract:

The specific aim of this research project is the development of novel methods for preparing improved catalysts for direct methanol fuel cells DMFCs. These catalysts consist of metal alloy nanoclusters dispersed onto a conductive carbon support. Synthetic control of the alloy nanocluster composition is achieved by preparing molecular precursors in which the precursor contains two or more metals of a desired stoichiometry. Adsorption of single-source molecular precursors onto Vulcan carbon powder followed by appropriate thermal treatment affords metal alloy or intermetalliccarbon nanocomposites having thirteen different binary compositions and one ternary composition. Tests performed in an operating DMFC indicate that the catalytic activity of two PtRuVulcan carbon nanocomposites as anode catalysts is superior to that of a similar commercial PtRuVulcan carbon catalyst. A rapid synthesis of such binary alloyVulcan carbon nanocomposites using microwave heating has been discovered. Preliminary attempts to prepare passivated metal nanoclusters suitable for size selection are also discussed. The preparation of an unrelated cobaltfullerene nanocomposite is included for completeness.

Subject Categories:

  • Inorganic Chemistry
  • Electrochemical Energy Storage

Distribution Statement:

APPROVED FOR PUBLIC RELEASE