کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9759230 | 1497700 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evaluation of colloidal Os and Os-Alloys (Os-Sn, Os-Mo and Os-V) for electrocatalysis of methanol and borohydride oxidation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 30, Issue 12, September 2005, Pages 1323-1331
Journal: International Journal of Hydrogen Energy - Volume 30, Issue 12, September 2005, Pages 1323-1331
نویسندگان
Mohammed H. Atwan, Derek O. Northwood, Elod L. Gyenge,