In this work the complex sol-gel process, which uses ascorbic acid as chelating agent, was applied to preparation of Pt-WO3 powders and coatings on carbon black and silver substrates. A saturated tungsten sol (0.15 M) was prepared by dissolving (NH4)4W5O 172.5H2O in an ascorbic acid solution. To this solution, H2PtCl6 was added to obtain the molar ratio Pt:W= 1. After evaporation and heating at 700°C for 2 h, homogeneous yellow-green powders were obtained. Another part of this solution was diluted with ethanol, ultrasonically mixed, and applied to Ag substrates by an immersion technique. Gel layers were dried at 200°C for 20 h and then calcined at 700°C for 2 h. The resulting layers (thickness 10-65 mm) were adherent. An aqueous ascorbate tungsten-platinum sol that was diluted to 0.03 or 0.06 M (sum of metal ions) was used for preparation of Pt-W catalysts by impregnation of carbon black Vulcan XC-72, followed by thermal treatment in air, argon, and hydrogen atmospheres.
|Pages (from-to)||71 - 74|
|Number of pages||4|
|Journal||Journal of New Materials for Electrochemical Systems|
|Publication status||Published - Apr 2003|
All Science Journal Classification (ASJC) codes
- Materials Chemistry
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
Deptula, A., Lada, W., Olczak, T., Sartowska, B., Giorgi, L., Moreno, A., & Di Bartolomeo, A. (2003). Preparation of Pt/WO3 Powders and Thin Films on Porous Carbon Black and Metal Supports by the Complex Sol-Gel Process. Journal of New Materials for Electrochemical Systems, 6(2), 71 - 74.