Reduction of Methanol Crossover in a Direct Methanol Fuel Cell by Using the Pt-Coated Electrolyte Membrane
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Pt-layer was deposited on the anode side of a Nafion membrane via a sputtering method in order toreduce methanol crossover in a direct methanol fuel cell (DMFC). The methanol permeationand the proton conduc-tivity through the modified membranes were investigated. The performances of the direct methanol fuel cel werealso tested using single cells with a Nafion membrane and the modified membranes. The Pt-layers on the membraneblocked both methanol crossover and proton transport through the membranes. Methanol permeability and proton con-ductivity decreased with an increase of the platinum layer thickness. At methanol concentration of 2 M, the DMFCemploying the modified membrane with a platinum layer of 66 nm-thickness showed similar performance to thatpower density of the cel using the modified membrane with a platinum layer of 66 nm-thickness increased slightlywhile that of the cel with the bare membrane decreased abruptly when a methanol solution of 6 M was supplied.
Abstract
Pt-layer was deposited on the anode side of a Nafion membrane via a sputtering method in order toreduce methanol crossover in a direct methanol fuel cell (DMFC). The methanol permeationand the proton conduc-tivity through the modified membranes were investigated. The performances of the direct methanol fuel cel werealso tested using single cells with a Nafion membrane and the modified membranes. The Pt-layers on the membraneblocked both methanol crossover and proton transport through the membranes. Methanol permeability and proton con-ductivity decreased with an increase of the platinum layer thickness. At methanol concentration of 2 M, the DMFCemploying the modified membrane with a platinum layer of 66 nm-thickness showed similar performance to thatpower density of the cel using the modified membrane with a platinum layer of 66 nm-thickness increased slightlywhile that of the cel with the bare membrane decreased abruptly when a methanol solution of 6 M was supplied.
참고문헌 (16)
- J. S. Wainright, "Acid-Doped Polybenzimidazoles: A New Polymer Electrolyte", J. Electrochem. Soc, 142, pp.L121~ (1995)
- P. Dimitrova, "Modified Nafion®-based Membranes for Use in Direct Methanol Fuel Cells", Solid State Ionics, 150, pp.115~ (2002)
- A. Heinzel, "A Review of the State-of-the-Art of the Methanol Crossover in Direct Methanol Fuel Cells", J. Power Sources, 84, pp.70~ (1999)
- D. Jung, "Preparation and Performance of a Nafion®", Montmorillonite Nanocomposite Membrane for Direct Methanol Fuel Cell, 2003, pp.118, 205~
- D Jung, "Single Cell Characteristics of Air Breathing DMFC by Pretreatment of Gas Diffusion Layer", J. Kor. Ind. Eng. Chem, 14, pp.676~ (2004)
- X. Ren, "Recent Advances in Direct Methanol Fuel Cells at Los Alamos National Laboratory", J Power Sources, 86, pp.111~ (2001)
- . K. Scott, "The Impact of Mass Transport and Methanol Crossover on the Direct Methanol Fuel Cell", J Power Sources, 83, pp.204~ (1999)
- C. K. Witham, "Performance of Direct Methanol Fuel Cells with Sputter-Deposited Anode Catalyst Layers", Electrochem. Solid-State Lett, 3, pp.497~ (2000)
- N. Jia, "Modification of Nafion Proton Exchange Membranes to Reduce Methanol Crossover in PEM Fuel Cells", J. Electrochem. Solid-State Lett, 3, pp.529~ (2000)
- Z. Q. Ma, "A Palladium-Alloy Deposited Nafion Membrane for Direct Methanol Fuel Cells", J. Membr. Sci, 215, pp.327~ (2003)
- S. Y, Cha, "Performance of Proton Exchange Memebrane Fuel Cell Electrodes Prepared by Direct Deposition of Ultra Thin Platinum on the Membrane Surface", J. Electrochem. Soc, 146, pp.4055~ (1999)
- J. T. Mueller, "Characterization of Direct Methanol Fuel Cells by ac Impedance Spectroscopy", J. Power Sources, 75, pp.139~ (1998)
- Y. Sone, "Proton Conductivity of Nafion 117 as Measured by a Four-Electrode AC Impedance Method", J. Electrochem. Soc, 143, pp.1254~ (1996)
- S. Yoon, "Modification of Polymer Electrolyte Membranes for DMFCs Using Pd Films Formed by Sputtering", J. Power sources, 106, pp.215~ (2002)
- T. A. Zawodizinski, "Determination of Water Diffusion Coefficients in Perfluorosulfonate Ionomeric Membranes", J. Phys. Chem, 95, pp.6040~ (1991)
- H. Guo, "2D Analytical Model of a Direct Methanol Fuel Cell", Electrochem. Comm, 6, pp.306~ (2004)