RuO 2 promoted Au/C catalysts for alkaline direct alcohol fuel cells
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Author list: Yongprapat S., Therdthianwong S., Therdthianwong A.
Publisher: Elsevier
Publication year: 2012
Journal: Electrochimica Acta (0013-4686)
Volume number: 83
Start page: 87
End page: 93
Number of pages: 7
ISSN: 0013-4686
Languages: English-Great Britain (EN-GB)
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Abstract
RuO 2 promoted Au/C catalysts at different Au:RuO 2 ratios (1:0.25, 1:0.5 and 1:1) were prepared and investigated for their catalytic activity and stability for glycerol and ethanol electrooxidation in alkaline solution. The average size of Au nanoparticles on RuO 2/C was around 4.1 ฑ 0.82 nm, which was slightly larger than that of Au/C. The electroactive surface areas of all the promoted catalysts decreased as Au:RuO 2 increased and were lower than that of Au/C. The catalytic activity of Au/C was clearly enhanced by RuO 2, as evaluated by cyclic voltammetry in which the current obtained from the ethanol oxidation on the promoted catalyst containing Au:RuO 2 at 1:0.25 was about two times higher than that on Au/C. In addition, it was observed that the RuO 2-promoted Au/C catalysts had higher stability for glycerol electrooxidation as determined by chronoamperometry. The increased stability of Au-RuO 2/C catalysts in glycerol electrooxidation might derive from the ability of RuO 2 to supply the oxygen-containing species to react with the reaction intermediates on Au surface. ฉ 2012 Elsevier Ltd. All rights reserved.
Keywords
Alcohol electrooxidation, Promoted Au/C, RuO 2
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