Carbon supported Pt plus Os catalysts for methanol oxidation

Gokagac G., Kennedy B.

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, vol.57, no.2, pp.193-201, 2002 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 57 Issue: 2
  • Publication Date: 2002
  • Journal Name: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.193-201
  • Keywords: methanol oxidation, carbon supported catalysts, platinum and osmium, ELECTROOXIDATION, REACTIVITY, ANODES
  • Middle East Technical University Affiliated: Yes

Abstract

11% Pt/C, 10% Pt + 1 % Os/C, 9% Pt + 2% Os/C, 8% Pt + 3% Os/C, 7% Pt + 4% Os/C, 6% Pt + 5% Os/C and 5% Pt + 6% Os/C catalysts have been prepared for methanol oxidation reaction. Transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and cyclic voltammetry have been used to understand the nature of the species present in these catalysts. 7% Pt + 4% Os/C was the most active catalyst, while 8% Pt + 3% Os/C was the least active one. It is found that the metal particle size and distribution on the carbon support, the surface composition and the oxidation states of the metal particles, the metal-metal and metal support interactions are important parameters to define the activity of the catalyst.