Abstract
A platinum (Pt) on pure ceria (CeO2) supported by carbon black (CB) anode was synthesized using a combined process of precipitation and coimpregnation methods. The electrochemical activity of methanol oxidation reaction on synthesized Pt-CeO2/CB anodes was investigated by cyclic voltammetry and chronoamperometry experimentation. To improve the anode property on Pt-CeO2/CB, the influence of particle morphology and particle size on anode properties was examined. The morphology and particle size of the pure CeO2 particles could be controlled by changing the preparation conditions. The anode properties (i.e., peak current density and onset potential for methanol oxidation) were improved by using nanosize CeO2 particles. This indicates that a larger surface area and higher activity on the surface of CeO2 improve the anode properties. The influence of particle morphology of CeO2 on anode properties was not very large. The onset potential for methanol oxidation reaction on Pt-CeO2/CB, which consisted of CeO2 with a high surface area, was shifted to a lower potential compared with that on the anodes, which consisted of CeO2 with a low surface area. The onset potential on Pt-CeO2/CB at 60 °C became similar to that on the commercially available Pt-Ru/carbon anode. We suggest that the rate-determining steps of the methanol oxidation reaction on Pt-CeO2/CB and commercially available Pt-Ru/carbon anodes are different, which accounts for the difference in performance. In the reaction mechanism on Pt-CeO2/CB, we conclude that the released oxygen species from the surface of CeO2 particles contribute to oxidation of adsorbed CO species on the Pt surface. This suggests that the anode performance of the Pt-CeO2/CB anode would lead to improvements in the operation of direct methanol fuel cells at 80 °C by the enhancement of diffusion of oxygen species created from the surface of nanosized CeO2 particles. Therefore, we conclude that fabrication of nanosized CeO2 with a high surface area is a key factor for development of a high-quality Pt-CeO2/CB anode in direct methanol fuel cells.
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References
T. Yajima, H. Uchida, and M. Watanabe: In situ ATR-FTIR spectroscopic study of electro-oxidation of methanol and adsorbed CO at Pt-Ru alloy. J. Phys. Chem. B 108, 2654 (2004).
T. Seiler, E.R. Savinova, K.A. Friedrich, and U. Stimming: Poisoning of PtRu/C catalysts in the anode of a direct methanol fuel cell: A DEMS study. Electrochim. Acta 49, 3927 (2004).
T. Frelink, W. Visscher, and J.A.R. van Veen: On the role of Ru and Sn as promoters of methanol electro-oxidation over Pt. Surf. Sci. 335, 353 (1995).
K.W. Park, J.H. Choi, B.K. Kwon, S.A. Lee, and Y.E. Sung: Chemical and electronic effects of Ni in Pt/Ni and Pt/Ru/Ni alloy nanoparticles in methanol electrooxidation. J. Phys. Chem. B 106, 1869 (2002).
M. Watanabe, Y. Zhu, and H. Uchida: Oxidation of CO on a Pt-Fe alloy electrode studied by surface enhanced infrared reflection-absorption spectroscopy. J. Phys. Chem. B 104, 1762 (2000).
C. Xu and P.K. Shen: Novel Pt/CeO2/C catalysts for electrooxidation of alcohols in alkaline media. Chem. Commun.2238 (2004).
C. Xu, R. Zeng, P.K. Shen, and Z. Wei: Synergistic effect of CeO2 modified Pt/C catalysts on the alcohols oxidation. Electrochim. Acta 51, 1031 (2005).
C.L. Campos, C. Roldan, M. Aponte, Y. Ishikawa, and C.R. Cabrera: Preparation and methanol oxidation catalysis of Pt-CeO2 electrode. J. Electroanal. Chem. 581, 206 (2005).
C. Bock and B. MacDougall: Novel method for the estimation of the electroactive Pt area. J. Electrochem. Soc. 150, E377 (2003).
J.H. Tian, F.B. Wang, Z.H.Q Shan, R.J. Wang, and J.Y. Zhang: Effect of preparation conditions of Pt/C catalysts on oxygen electrode performance in proton exchange membrane fuel cells. J. Appl. Electrochem. 34, 461 (2004).
R. Venkataraman, H.R. Kunz, and J.M. Fenton: Development of new CO-tolerant ternary anode catalysts for proton exchange membrane fuel cell. J. Electrochem. Soc. 150, A278 (2003).
Z. Liu, X.Y. Ling, X. Su, and J.Y. Lee: Carbon-supported Pt and PtRu nanoparticles as catalysts for a direct methanol fuel cell. J. Phys. Chem. B 108, 8234 (2004).
R.K. Raman, A.K. Shukla, A. Gayen, M.S. Hegde, K.R. Priolkar, P.R. Sarode, and S. Emura: Tailoring a Pt-Ru catalyst for enhanced methanol electro-oxidation. J. Power Sources 157(1), 45 (2006).
S. Haruyama: Growth of anode oxide thin film, in Electrochemistry for Surface Science Engineers, edited by S. Haruyama (Maruzen Company, Tokyo, Japan, 2001) pp. 220–223.
J. Hladik: Potential-sweep chronoamperometry and chronopotentiometry, in Physics of Electrolytes, Vol. 2, (Academic Press, London, 1972), pp. 880–882.
H.A. Gasteiger, N. Markovic, P.N. Ross, and E.J. Cairns: Temperature-dependent methanol electro-oxidation on well-characterized Pt-Ru alloys. J. Electrochem. Soc. 141, 1795 (1994).
S.L. Gojkovic, T.R. Vidakovic, and D.R. Durovic: Kinetic study of methanol oxidation on carbon-supported PtRu electrocatalyst. Electrochim. Acta 48, 3607 (2003).
G. Wu, L. Li, and B.Q. Xu: Effect of electrochemical polarization of PtRu/C catalysts on methanol electrooxidation. Electrochim. Acta 50, 1 (2004).
V.S. Entina and O.A. Petrii: Electrooxidation of methanol on Pt+Ru and Ru electrodes at different temperatures. Elektrokhimiya 4, 678 (1968).
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Takahashi, M., Mori, T., Vinu, A. et al. Preparation and anode property of Pt-CeO2 electrodes supported on carbon black for direct methanol fuel cell applications. Journal of Materials Research 21, 2314–2322 (2006). https://doi.org/10.1557/jmr.2006.0281
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DOI: https://doi.org/10.1557/jmr.2006.0281