Preparation, structural characterization and activity for ethanol oxidation of carbon supported ternary Pt-Sn-Rh catalysts

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作者：
Colmati, F. [1 ]
Antolini, E. [1 ]
Gonzalez, E.R. [1 ]
机构：
[1] Instituto de Química de São Carlos, USP, C.P. 780, São Carlos, SP 13560-970, Brazil
来源：
Journal of Alloys and Compounds | 2008年 / 456卷 / 1-2期
关键词：
Carbon supported ternary Pt-Sn-Rh (1:1:0.3 and 1:1:1) alloy catalysts were synthesized by reduction of the metal precursors with formic acid and characterized by EDX; XRD and TEM analyses. Their activity for ethanol oxidation was compared with that of binary Pt-Sn/C and Pt-Rh/C prepared with the same method. XRD analysis indicated that both the lattice parameter and the crystallite size of the Pt-Sn-Rh alloy catalysts are higher than those of Pt-Rh/C and lower than those of Pt-Sn/C. The intermediate value of the particle size of the ternary alloy catalysts was confirmed by TEM images. Linear sweep voltammetry measurements indicated that; for potentials higher than 0.45 V versus RHE; the ternary Pt-Sn-Rh alloy catalysts possess the higher activity for ethanol electro-oxidation; while for potentials lower than 0.45 V versus RHE the electrochemical activity of the ternary catalysts was lower than that of the binary Pt-Sn catalyst. The enhanced activity for ethanol electro-oxidation on the ternary Pt-Sn-Rh catalysts was ascribed to the formation of a ternary alloy and to the lower particle size. © 2007 Elsevier B.V. All rights reserved;
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页码：264 / 270
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