Abstract
An electrode-kinetic study of the oxidation of CO and CO/H2 mixtures on a Pt–Ru/C catalyst was carried out in phosphotungstic acid (PWA) electrolyte. The influence of temperature, CO partial pressure and proton concentration on the electrochemical oxidation rate was investigated. An apparent activation energy of about 50kJmol−1 was found for CO oxidation at 0.6V vs NHE. Fractional reaction orders close to 0.5 and −0.4 with respect to carbon monoxide and proton concentration, respectively, were observed. Tafel slopes were close to 136mVdec−1 at 70°C for both CO and CO/H2 oxidation. The PWA electrolyte appeared to promote the methanol electrooxidation by increasing the rate of water discharge at the electrode.
Similar content being viewed by others
References
O. Savadogo and A. Essalik, J. Electrochem. Soc. 141 (1994) L92.
O. Savadogo and A. Essalik, US Patent 5 298 343 (1994).
A. Essalik, O. Savadogo and F. Ajersch, J. Electrochem. Soc. 142 (1995) 1368.
O. Savadogo and A. Essalik, J. Electrochem. Soc. 143 (1996) 1814.
O. Savadogo and A. Essalik in the Proceedings of the First International Symposium on New Materials for Fuel Cell Systems (edited by O. Savadogo, P. Roberge and T. N. Veziroglu), Montreal, 9-13 July (1995), p. 688.
N. Giordano, A. S. Aricò, S. Hocevar, P. Staiti, P. L. Antonucci and V. Antonucci, Electrochim. Acta 38 (1993) 1733.
N. Giordano, S. Hocevar, P. Staiti and A. S. Aricò, ibid. 41 (1996) 397.
S. Gilman, J. Phys. Chem. 66 (1962) 2657.
M. W. Breiter, J. Electroanal. Chem. 65 (1975) 623.
P. Stonehart, Electrochim. Acta 18 (1973) 63.
P. Stonehart and G. Kohlmayr, ibid. 17 (1972) 369.
W. Vogel, J. Lundquist, P. Ross and P. Stonehart, ibid. 20 (1975) 79.
P. Stonehart and P. N. Ross, ibid. 21 (1976) 441.
J. M. Leger, B. Beden and C. Lamy, J. Electroanal. Chem. 170 (1984) 305.
H. P. Dhar, L. G. Christner, A. K. Kush and H. C. Maru, J. Electrochem. Soc. 133 (1986) 1574.
K. Kunimatsu, W. G. Golden, H. Seki and M. R. Philpott, Langmuir 1 (1985) 245.
H. P. Dhar, L. G. Christner and A. K. Kush, J. Electrochem. Soc. 134 (1987) 3021.
H. A. Gasteiger, N. Markovic, P. N. Ross Jr. and E. J. Cairns, J. Phys. Chem. 98 (1994) 617.
J. H. Hirschenhofer, D. B. Stauffer and R. R. Engleman, in ‘Fuel Cells, A Handbook’ (3rd revision), DOE, Morgantown, West Virginia (1994).
A. S. Aricò, H. Kim, A. K. Shukla, M. K. Ravikumar, V. Antonucci and N. Giordano, Electrochim. Acta 39 (1994) 691.
A. R. J. Kucernak, C. J. Barnett, G. T. Burstein and K. R. Williams, in Proceedings of the first international symposium on new materials for fuel cell systems (edited by O. Savadogo, P. R. Roberge and T. N. Veziroglu), 9-13 July, Montréal Québec, Canada (1995).
R. Parsons and T. VanderNoot, J. Electroanal. Chem. 257 (1988) 9.
B. Beden, C. Lamy, N. R. De Tacconi and A. J. Arvia, Electrochim. Acta 35 (1990) 691.
A. S. Aricò, V. Antonucci, V. Alderucci, V. Alderucci, E. Modica and N. Giordano, J. Appl. Electrochem. 23 (1993) 1107.
A. S. Aricò, A. K. Shukla, V. Antonucci and N. Giordano, J. Power Sources 50 (1994) 177.
A. S. Aricò, P. L. Antonucci, E. Modica, E. Passalacqua and V. Antonucci, J. Appl. Electrochem., 27 (1997) 1275.
A. S. Aricò, P. Cretì, H. Kim, R. Mantegna, N. Giordano and V. Antonucci, J. Electrochem. Soc. 143 (1996) 3950.
H. A. Gasteiger, N. Markovic and P. N. Ross Jr., J. Phys. Chem. 99 (1995) 8290.
T. E. Madey, H. A. Engelhardt and D. Menzel, Surf. Sci. 48 (1975) 304.
M. Watanabe and S. Motoo, J. Electroanal. Chem. 60 (1975) 275.
I. V. Kozhevnikov, S. Ts. Khankhasaeva and S. M. Kulikov, Kinetika i Kataliz. 29 (1988) 76.
P. G. Allen, S. D. Conradson, M. S. Wilson, S. Gottesfeld, I. D. Raistrick, J. Valerio and M. Lovato, Electrochim. Acta 39 (1994) 2415.
R. Inada, K. Shimazu and H. Kita, J. Electroanal. Chem. 277 (1990) 315.
V. S. Bagotzky and Yu. B. Vassiliev, Electrochim. Acta 12 (1967) 1323.
H. A. Gasteiger, N. Markovic and P. N. Ross Jr., J. Phys. Chem. 99 (1995) 16757.
I. V. Kozhevnikov and K. I. Matveev, Appl. Catal. 5 (1983) 135.
J. McHardy, in Proceedings of the Symposium on Electrode Materials and Processes for Energy Conversion and Storage (edited by J. D. E. McIntyre, S. Srinivasan and P. G. Will) Vol. 77-6, (1977), The Electrochemical Society, Pennington, NJ, p. 537.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Aricò, A.S., Modica, E., Ferrara, I. et al. CO and CO/H2 electrooxidation on carbon supported Pt–Ru catalyst in phosphotungstic acid (H3PW12O40) electrolyte. Journal of Applied Electrochemistry 28, 881–887 (1998). https://doi.org/10.1023/A:1003456119509
Issue Date:
DOI: https://doi.org/10.1023/A:1003456119509