Abstract
This research focuses on Nafion modification using plasma techniques for direct methanol fuel cell applications. The results indicated the both argon (Ar) and carbon tetrafluoride (CF4) plasma treatments modified the Nafion surface substantially without altering the bulk properties. The Nafion surface exposed to CF4 plasma resulted in a more hydrophobic layer and an even lower MeOH permeability than the Ar-treated membrane. The plasma operating conditions using CF4 were optimized by utilizing an experimental design. The minimum MeOH permeability was reduced by 74%. The conductivity was 1–2×10-3 S/cm throughout the entire experimental range. Suppressed MeOH permeability can be achieved while maintaining the proton conductivity at a satisfactory level by adjusting the plasma operating conditions.
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d’Agostino, R., Cramarossa, F., Fracassi, F., De Simoni, E., Sabbatini, L., Zambonin, P. G. and Caporiccio, G., “Polymer film formation in C2F6-H2 discharges,”Thin Solid Films,143, 163 (1986).
ASTM,Annual book of ASTM standards, Designation D 638-91: Standard test method for tensile properties of plastics, American Society for Testing and Materials, West Conshohocken, PA, USA (1994).
Carretta, N., Tricoli, V. and Picchioni, F., “Ionomeric membranes based on partially sulfonated poly(styrene): Synthesis, proton conductivity and methanol permeation,”J. Membr. Sci.,166, 189 (2000).
Choi, W. C., Kim, J. D. and Woo, S. I., “Modification of proton conducting membrane for reducing methanol crossover in a direct-methanol fuel cell,”J. Power Sources,96, 411 (2001).
DuPont, Dupont Nafion PFSA Membranes. Product Information NAE101, Fayetteville, North Carolina, USA. p. 2, Feb. 2004.
Elabd, Y. A., Napadensky, E., Sloan, J. M., Crawford, D. M. and Walker, C. W., “Triblock copolymer ionomer membranes. Part I. Methanol and proton transport,”J. Membr. Sci.,217, 227 (2003).
Damay, F. and Klein, L. C., “Transport properties of nafion composite membranes for proton-exchange membranes fuel cells,”Solid State Ionics,162–163, 261 (2003).
Feichtinger, J., Galm, R., Walker, M., BaumgÄrtner, K. M., Schulz, A., RÄuchle, E. and Schumacher, U., “Plasma polymerized barrier films on membranes for direct methanol fuel cells,”Surf. Coat. Technol.,142–144, 181 (2001).
Heinzel, A. and Barragan, V. M., “A review of the state-of-the-art of the methanol crossover in direct methanol fuel cells,”J. Power Sources,84, 70 (1999).
Hobson, L. J., Ozu, H., Yamaguchi, M. and Hayase, S., “Modified Nafion 117 as an improved polymer electrolyte membrane for direct methanol fuel cells,”J. Electrochem. Soc.,148, A1185 (2001).
Kim, B., Kwon, K. H., Kwon, S. K., Park, J. M., Yoo, S. W., Park, K. S., You, I. K. and Kim, B. W., “Modeling etch rate and uniformity of oxide via etching in a CHF3/CF4 plasma using neural networks,”Thin Solid Films,426, 8 (2003).
Kim, J., Kim, B. and Jung, B., “Proton conductivities and methanol permeabilities of membranes made from partially sulfonated polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene copolymers,”J. Membr. Sci.,207, 129 (2002).
Lee, S., Kim, D., Lee, J., Chung, S. T. and Ha, H. Y., “Comparative studies of a single cell and a stack of direct methanol fuel cells,”Korean J. Chem. Eng.,22, 406 (2005).
Li, L., Zhang, J. and Wang, Y., “Sulfonated poly(ether ether ketone) membranes for direct methanol fuel cell,”J. Membr. Sci.,226, 159 (2003).
Lue, S. J., Juang, H. and Hou, S., “Permeation of xylene isomers through supported liquid membranes containing cyclodextrins,”Sep. Sci. Technol.,37, 463 (2002).
Lue, S. J., Shih, T. S., Wei, T. C., “Surface modification on a Nafion membrane under Ar and CF4 plasmas,” in preparation. (2006).
Ma, Z. Q., Cheng, P. and Zhao, T. S., “A palladium-alloy deposited nafion membrane for direct methanol fuel cells,”J. Membr. Sci.,215, 327 (2003).
Manea, C. and Mulder, M., “Characterization of polymer blends of polyethersulfone/ sulfonated polysulfone and polyethersulfone/sulfonated polyetheretherketone for direct methanol fuel cell applications,”J. Membr. Sci.,206, 443 (2002).
Montgomery, D. C.,Design and analysis of experiments, fifth ed., John Wiley, New York (2001).
Pak, C., Lee, S. J., Lee, S. A. and Chang, H., “The effect of two-layer cathode on the performance of the direct methanol fuel cell,”Korean J. Chem. Eng.,22, 214 (2005).
Sauk, J., Byun, J., Kang, Y. and Kim, H., “Preparation of laminated composite membranes by impregnation of polypropylene with styrene in supercritical CO2 for direct methanol fuel cells,”Korean J. Chem. Eng.,22, 605 (2005).
Scott, M., Taama, W. M. and Argyropoulos, P., “Performance of the direct methanol fuel cell with radiation-grafted polymer membranes,”J. Membr. Sci.,171, 119 (2000).
Walker, M., BaumgÄrtner, K. M., Feichtinger, J., Kaiser, N., RÄuchle, E. and Kerres, J., “Barrier properties of plasma-polymerized thin films,”Surf. Coat. Technol.,116–119, 996 (1999).
Woo, Y., Oh, S. Y., Kang, Y. S. and Jung, B., “Synthesis and characterization of sulfonated polyimide membranes for direct methanol fuel cell,”J. Membr. Sci.,220, 31 (2003).
Yin, Y., Fang, J., Cui, Y., Tanaka, K., Kita, H. and Okamoto, K. I., “Synthesis, proton conductivity and methanol permeability of a novel sulfonated polyimide from 3-(2′,4′-diaminophenoxy)propane sulfonic acid,”Polymer,44, 4509 (2003).
Zeng, R., Pang, Z. and Zhu, H., “Modification of a nafion ion exchange membrane by a plasma polymerization process,”J. Electroanal. Chem.,490, 102 (2000).
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Lue, S.J., Shih, TS. & Wei, TC. Plasma modification on a Nafion membrane for direct methanol fuel cell applications. Korean J. Chem. Eng. 23, 441–446 (2006). https://doi.org/10.1007/BF02706747
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DOI: https://doi.org/10.1007/BF02706747