Co-deposition of Pt and Ceria Anode Catalyst in Supercritical Carbon Dioxide for Direct Methanol Fuel Cell Applications

You, E. Y. and Guzman-Blas, R. and Nicolau, E. and Scibioh, M. A. and Karanikas, C. F. and Watkins, J. J. and Cabrera, C. R.. (2012) Co-deposition of Pt and Ceria Anode Catalyst in Supercritical Carbon Dioxide for Direct Methanol Fuel Cell Applications. Electrochimica Acta, 75. pp. 191-200.

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Pt and mixed Pt-ceria catalysts were deposited onto gas diffusion layers using supercritical fluid deposition (SFD) to fabricate thin layer electrodes for direct methanol fuel cells. Dimethyl (1,5-cyclooctadiene) platinum (II) (CODPtMe2) and tetrakis (2,2,6,6-tetramethyl 3,5-heptanedionato) cerium (IV) (Ce(tmhd)(4)) were used as precursors. Hydrogen-assisted Pt deposition was performed in compressed carbon dioxide at 60 degrees C and 17.2 MPa to yield high purity Pt on carbon-black based gas diffusion layers. During the preparation of the mixed Pt-ceria catalyst, hydrogen reduction of CODPtMe2 to yield Pt catalyzed the deposition of ceria from Ce(tmhd)(4) enabling co-deposition at 150 degrees C. The catalyst layers were characterized using Xray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope-energy dispersive spectral (SEM-EDS) analyses. Their electrochemical performance toward methanol oxidation was examined in half cell mode using a three electrode assembly as well as in fuel cell mode. The thin layer electrodes formed via SFD exhibited higher performance in fuel cell operations compared to those prepared by the conventional brush-paint method. Furthermore, the Pt-ceria catalyst with an optimized composition exhibited greater methanol oxidation activity than pure platinum. (C) 2012 Elsevier Ltd. All rights reserved.

Item Type: Article
Additional Information: You, Eunyoung Guzman-Blas, Rolando Nicolau, Eduardo Scibioh, M. Aulice Karanikas, Christos F. Watkins, James J. Cabrera, Carlos R.
Collections: Nanomanufacturing Research Collection > Nanomanufacturing Nanoscale Science and Engineering Centers > Center for Hierarchical Manufacturing
Depositing User: Robert Stevens
Date Deposited: 26 Mar 2014
Last Modified: 26 Mar 2014 19:44

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