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Scanning Force Microscopy Study of Phase Segregation in Fuel Cell Membrane Materials as a Function of Solvent Polarity and Relative Humidity

  • Marilyn Hawley (a1), Yu Seung Kim (a2) and Rex P. Hjelm (a3)

Scanning force microscopy (SFM) phase imaging provides a powerful method for directly studying and comparing phase segregation in fuel cell membrane materials due to different preparation and under different temperature and humidity exposures. In this work, we explored two parameters that can influence phase segregation: the properties of the solvents used in casting membrane films and how these solvents alter phase segregation after exposure to boiling water as a function of time. SFM was used under ambient conditions to image phase segregation in Nafion samples prepared using five different solvents. Samples were then subjected to water vapor maintained at 100°C for periods ranging from 30 minutes to three hours and re-imaged using the same phase imaging conditions. SFM shows what appears to be an increase in phase segregation as a function of solvent polarity that changes as a function of water exposure.

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1Ma, C.-H., Yu, T.L., Lin, H.-L., Huang, Y.-T., Chen, Y.-L., Jeng, U-S., Lai, Y.-H., and Sun, Y.-S., Polymer 50, 1764 (2009).
2Zawodzinski, T.A., Springer, T.E., Davey, J., Jestel, R., Lopez, C., Valerio, J., and Gottesfeld, S., J. Electrochem. Soc. 140, 1981 (1993)
3Whangbo, M.-H., Magonov, S.N., and Elings, V., Surface Science 375(2-3), L385 (1997).
4McLean, R.S. and Sauer, B., Macromolecules 30(26), 8314, (1997).
5Einsla, Melinda L., Kim, Yu Seung, Hawley, Marilyn, Lee, Hae Seung, McGrath, James E., and Pivovar, Bryan S., Chem. Mat 20(17), 5636 (2008).
6Hill, T.A., Carroll, D.L., Czerw, R., Martin, C.W., and Perahia, D., J. Polymer Sci. B: Polymer Phys. 41(2) , 149 (2003).
7James, P.J., Antognozzi, M., Tamayo, J., McMaster, T.J., Newton, J.M., and Miles, M.J., Langmuir 17, 349 (2001).
8James, P.J., McMaster, T.J., Newton, J.M., and Miles, M.J. Miles, Polymer 41, 4223 (2000).
9Johnston, C.M., Lee, K.-S., Rockward, T., Labouriau, A., Welch, C., Orler, E.B., Hawley, M.E., Hjelm, R.P., Mack, N., and Kim, Y. S., “Non Non-aqueo aqueous Perfluorosulfonic Acid us Dispersions for Improved Fuel Cell Durability,” to be submitted for publication.
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  • ISSN: -
  • EISSN: 1946-4274
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