Preparation of Pt/WO3 Powders and Thin Films on Porous Carbon Black and Metal Supports by the Complex Sol-Gel Process

A. Deptula, W. Lada, T. Olczak, B. Sartowska, L. Giorgi, A. Moreno, A. Di Bartolomeo

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Abstract

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.
Original languageEnglish
Pages (from-to)71 - 74
Number of pages4
JournalJournal of New Materials for Electrochemical Systems
Volume6
Issue number2
Publication statusPublished - Apr 2003

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All Science Journal Classification (ASJC) codes

  • Electrochemistry
  • Materials Chemistry
  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials

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