A. Oliveira Neto,* E.G. Franco, E. Aricó, M. Linardi

Instituto de Pesquisa Energéticas e Nucleares - Centro de Ciência e Tecnologia de Materiais - Laboratório de Células a Combustível PEM, Travessa R, No. 400, SP, Brasil

Received 26 December 2002; accepted 4 March 2004

Abstract

Pt-Ru/C, Pt-Dy and Pt-Ru-Mo/C electrocatalysts prepared by Bönnemann´s method have been studied as porous thin films on high surface area carbon electrodes, in order to evaluate their electroactivity on CO desorption in PEM fuel cells. For comparison electrode precursor powders with and without thermal treatment were considered.

Cyclic voltammetry showed that addition of Mo in the well-established Pt/Ru system is very promising for methanol oxidation. In order to compare the electroactivity of different catalysts a normalization procedure based on the amount of Pt was used.

Keywords: platinum; electrocatalysis; catalyst; voltammetry; fuel cell.

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References

1. H. Wendt, M. Gotz, M. Linardi,. Química Nova 4 (2000) 538-546.        [ Links ]

2. P. Berlowitz, Exxon Mobil Research and Engineering in SAE Word Congress Preview, "Global Automotive Network" - SAE International, Issue 11 Feb 2001.        [ Links ]

3. M. F altenbacher, Alternative Fuels for Fuel Cell Powered Buses Compared to Diesel Powered Buses, University of Stuttgart, April 2000, SAE 2000-01-1484.        [ Links ]

4. C.E. Thomas, Societal Impacts of Fuel Options for Fuel Cell Vehicles, Directed Technologies, Inc, October 1998, SAE 982496.        [ Links ]

5. J.P.I. Souza, F.J.B.Rabelo, I.R. de Moraes, F.C. Nart, J. Electroanal. Chem. 420 (1997) 17-20.        [ Links ]

6. R. Ianniello, V.M. Schmidt, J.L. Rodrigues, E. Pastor, J. Electroanal. Chem. 471 (1999) 167-179.        [ Links ]

7. N. Fujiwara, K.A. Friedrich, U. Stimming, J. Electroanal. Chem. 472 (1999) 120-125.        [ Links ]

8. H. Hitmi, E.M. Belgsir, J.M. Léger, C. Lamy, R.O. Lezna, Electrochim. Acta 39 (1994) 407-15.        [ Links ]

9. A. Oliveira Neto, J. Perez, W.T. Napporn, E.A. Ticianelli, E.R. Gonzalez, Electrooxidation of methanol on binary platinum based catalysts. in Workshop Electrocatalysis in Indirect and Direct Methanol PEM Fuel Cells, 3rd International Symposium in Electrocatalysis. Portoroz, Slovenia, 1999, 83-6.        [ Links ]

10. N. Fujiwara, K.A. Friedrich, U. Stimming, J. Electroanal. Chem. 472 (1999) 120-125.        [ Links ]

11. A. Oliveira Neto, M.J. Giz, J. Perez, E.A. Ticianelli and E.R. Gonzalez, J. Electrochem. Soc. 149 (2002) A272-A279.        [ Links ]

12. C.T. Hable, M.S. Wrighton, Langmuir 9 (1993) 3284-90.        [ Links ]

13. J. Wang, S. Wasmus, R.F. Savinelli,J. Electrochem. Soc. 142 (1995) 4218-24.        [ Links ]

14. M. Gotz, H. Wendt,Eletrochim. Acta 43-24 (1998) 3637.        [ Links ]

15.E.G. Franco, M. Linardi, E. Aricó, Proceedings of the XII SIBEE Simpósio Brasileiro de Eletroquímica e Eletroanalítica, Gramado – RS – Brasil (2001).        [ Links ]

16. A. Oliveira Neto, Estudos Eletroquímicos sobre Eletrocatalisadores a Base de Platina Dispersos em Carbono de Alta Área Superficial, PhD Thesis, University of São Paulo, Brazil, 2001.         [ Links ]

17. A. Oliveira Neto, J. Perez, W.T. Napporn, E.A. Ticianelli, E.R. Gonzalez, J. B. Chem. Soc. 11, N1 (2000) 39-43.        [ Links ]

18. T.J. Schimidt, H.A. Gasteiger, R.J. Behm, Eletrochem. Communications 1 (1999) 1–4.        [ Links ]

*Corresponding author. E-mail address: neto.almir@bol.com.br