Fevereiro 2015 vol. 1 num. 2 - XX Congresso Brasileiro de Engenharia Química
Artigo - Open Access.
Pt-Sn Catalysts for Ethanol Oxidation in Fuel Cell Systems: Effect of reducing choice
LÓPEZ-SUÁREZ, F. E.; CARVALHO-FILHO, C. T.; BUENO-LÓPEZ, A.; EGUILUZ, K. I. B.; SALAZAR-BANDA, G. R.;
The Pt-Sn/C electrocatalysts performance greatly depends on preparation procedures and Pt:Sn atomic ratios. Here, we synthesized a series of Pt-Sn/C nanoparticle catalyst with a 20% (w/w) metal load (Pt + Sn) on carbon black with a nominal Pt:Sn atomic ratio of 3:1, NaBH4 (A) using and formic acid (B) as reducing agents aiming to study the effect of preparation method on chemical–physical properties of electrocatalyst. The onset potential of ethanol electrooxidation over Pt-Sn/C catalyst was shifted by about 0.03 V negatively in comparison with that over Pt/C catalysts. At lower potential than 0.4 V, Pt–Sn/C – (A) shows the highest current density value, while at potentials higher than 0.4 V, the Pt–Sn/C – (B) catalyst has the highest activity. The difference of activity of Pt-Sn/C – (A) and Pt-Sn/C – (B) catalyst is attributed to different grade of interaction between platinum and tin for bimetallic catalysts produced from the preparation method and capacity of reduction of reducing agent.
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LÓPEZ-SUÁREZ, F. E.; CARVALHO-FILHO, C. T.; BUENO-LÓPEZ, A.; EGUILUZ, K. I. B.; SALAZAR-BANDA, G. R.; "Pt-Sn Catalysts for Ethanol Oxidation in Fuel Cell Systems: Effect of reducing choice", p. 7845-7852 . In: Anais do XX Congresso Brasileiro de Engenharia Química - COBEQ 2014 [= Blucher Chemical Engineering Proceedings, v.1, n.2].
São Paulo: Blucher,
ISSN 2359-1757, DOI 10.5151/chemeng-cobeq2014-0883-22832-176633
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