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http://dx.doi.org/10.5229/JKES.2008.11.2.109

Synthesis and Characterization of Pt based Alloy Catalysts for Direct Ethanol Fuel Cell  

Kim, Yi-Young (Center for Fuel Cell Research, Korea Institute of Science and Technology)
Kim, Soo-Kil (Department of Chemical Engineering, Yonsei University)
Han, Jong-Hee (Center for Fuel Cell Research, Korea Institute of Science and Technology)
Kim, Han-Sung (Center for Fuel Cell Research, Korea Institute of Science and Technology)
Publication Information
Journal of the Korean Electrochemical Society / v.11, no.2, 2008 , pp. 109-114 More about this Journal
Abstract
Though ethanol can theoretically generate 12 electrons during oxidation to carbon dioxide, the complete oxidation of ethanol is hard to achieve due to the strong bond between the two carbons in its molecular structure. Therefore, development of high activity catalyst for ethanol oxidation is necessary for the commercialization of direct ethanol fuel cell. In this study, some binary and ternary electrocatalysts of PtSn/C and PtSnAu/C have been synthesized and characterized. The catalysts were fabricated with modified polyol method with the amounts of 20 wt%, where the Pt : Sn ratios in the PtSn/C were 1 : 0, 4 : 1, 3 : 1, 2 : 1, 1.5 : 1, 1 : 1, 1 : 1.5 and Pt:Sn:Au ratios in the PtSnAu/C were 5 : 5 : 0, 5 : 4 : 1, 5 : 3 : 2, 5 : 2 : 3. From the XRD and TEM analysis results, the catalysts were found to have face centered cubic structure with particle size of around $1.9{\sim}2.4\;nm$. The activity in the ethanol oxidation was examined with cyclic voltammetry and the results indicated that PtSn(1.5 : 1)/C and PtSnAu(5 : 2 : 3)/C had the highest activity in each catalyst system. Further tests with single cell were performed with those catalysts. It was found that PtSn/C(1.5 : 1) exhibited the best performance while the long term stability of PtSnAu/C(5 : 2 : 3) is better than PtSn/C(1.5 : 1).
Keywords
Direct ethanol fuel cell; Catalyst; PtSn/C; PtSnAu/C;
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