| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9759230 | International Journal of Hydrogen Energy | 2005 | 9 Pages |
Abstract
The oxidation of methanol and sodium borohydride (NaBH4) on supported colloidal Os and Os-alloys (i.e. Os-Sn, Os-Mo and Os-V) have been studied by voltammetry and chrono-techniques (i.e., potentiometry, amperometry). The electrolytes were: 0.5Â M H2SO4 for methanol oxidation and 2Â M NaOH (without and with 1.5Ã103M thiourea (TU)) for borohydride oxidation, respectively. Voltammetry results showed that the investigated Os-based materials were catalytically inactive with respect to methanol oxidation, contradicting therefore, the theoretical suggestion by Kua and Goddard [J Am Chem Soc 1999; 121:10928-41] indicating electrocatalytic activity for Os toward methanol oxidation. Regarding the oxidation of borohydride, for direct borohydride fuel cells, preliminary results showed a voltammetric wave, with oxidation potentials between 0.1 and 0.3Â V vs. Ag/AgCl, KClstd, which were attributed to borohydride and TU oxidation. Chronopotentiometry results of Os-alloys showed a more positive operating potentials compare to colloidal Os catalysts.
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Authors
Mohammed H. Atwan, Derek O. Northwood, Elod L. Gyenge,