Incorporation of RuSex/C within nanostructural Ir matrices to enhance oxygen reduction
|Beata Baranowska , Hanna Elzanowska , Magdalena Skunik , Paweł J. Kulesza|
Warsaw University, Faculty of Chemistry, Pasteura 1, Warszawa 02-093, Poland
One of the main aims of the research on fuel cells is creating the most efficient electrocatalysts for oxygen reduction. The platinum based catalysts have been so far most commonly used systems for cathodes. However the problem is the high activity of Pt towards methanol oxidation, which reduces possibility of its using as cathode in Direct Methanol Fuel Cells (DMFCs) in which methanol crossover through the polymer membrane from the anode to the cathode can occur. Direct reaction of a fuel with catalyst at the cathode leads to its depolarization and to the drop of the cell power. An interesting alternative to Pt-based catalysts in DMFCs can be RuSex nanoparticles, because of it’s high methanol tolerance. But to make system more attractive, the potential of the oxygen reduction should be shifted towards more positive values. This feature has been recently achieved by us via modification of carbon-supported RuSex nanoparticles with ultra-thin films of tungsten oxide (WO3).
Presentation: Poster at SMCBS'2007 International Workshop, by Beata Baranowska
See On-line Journal of SMCBS'2007 International Workshop
Submitted: 2007-09-25 16:23 Revised: 2009-06-07 00:48