Nanocatalysts for Ethanol Oxidation. Synthesis and Characterisation

 

A. Bonesi, W. E. Triaca, A. M. Castro Luna *

 

INIFTA, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Suc. 4, CC 16 1900, La Plata, Argentina

 

Received 25 April 2008; Accepted 10 December 2008

 

Abstract

Carb on-supported binary PtSn/C and ternary PtSnNi/C catalysts were prepared for the electro-oxidation of ethanol. The carbon-supported nanoparticles were synthesised by employing a modified polyol methodology and characterised in terms of structure, morphology and composition by using XRD, EDX and TEM techniques. Their electro-catalytic behaviour for ethanol oxidation (EO) was investigated by employing a disc-composite electrode covered by a thin layer of catalyst imbedded in a Nafion polymer electrolyte film. An enhancement of the EO through a negative shift of the onset oxidation potential and higher current density at constant potentials were observed on the PtSnNi/C electrodes as compared to those for PtSn/C electrodes. The temperature was changed in the range 40 ºC ≤ t ≤ 80 ºC, and the variation of the activation energy calculated by linear regression of the Arrhenius plots.

Keywords: tin, nickel, platinum, ethanol, polyol, catalyst.

 

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* Corresponding author. E-mail address: castrolu@inifta.unlp.edu.ar