Carbon supported Pt plus Os catalysts for methanol oxidation

Gokagac G., Kennedy B.

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, cilt.57, sa.2, ss.193-201, 2002 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 57 Sayı: 2
  • Basım Tarihi: 2002
  • Dergi Adı: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.193-201
  • Anahtar Kelimeler: methanol oxidation, carbon supported catalysts, platinum and osmium, ELECTROOXIDATION, REACTIVITY, ANODES
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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.