Water Dynamics in Nafion Fuel Cell Membranes: the Effects of Confinement and Structural Changes on the Hydrogen Bond Network.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
David E MoilanenM D Fayer

Abstract

The complex environments experienced by water molecules in the hydrophilic channels of Nafion membranes are studied by ultrafast infrared pump-probe spectroscopy. A wavelength dependent study of the vibrational lifetime of the O-D stretch of dilute HOD in H(2)O confined in Nafion membranes provides evidence of two distinct ensembles of water molecules. While only two ensembles are present at each level of membrane hydration studied, the characteristics of the two ensembles change as the water content of the membrane changes. Time dependent anisotropy measurements show that the orientational motions of water molecules in Nafion membranes are significantly slower than in bulk water and that lower hydration levels result in slower orientational relaxation. Initial wavelength dependent results for the anisotropy show no clear variation in the time scale for orientational motion across a broad range of frequencies. The anisotropy decay is analyzed using a model based on restricted orientational diffusion within a hydrogen bond configuration followed by total reorientation through jump diffusion.

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Citations

Mar 23, 2011·Accounts of Chemical Research·Michael D Fayer
Feb 22, 2012·Chemical Reviews·Hongwei Zhang, Pei Kang Shen
Oct 18, 2007·Proceedings of the National Academy of Sciences of the United States of America·Sungnam Park, M D Fayer
Dec 25, 2008·Proceedings of the National Academy of Sciences of the United States of America·David E MoilanenM D Fayer
Aug 27, 2009·Proceedings of the National Academy of Sciences of the United States of America·Emily E FennM D Fayer
Jul 20, 2010·Annual Review of Analytical Chemistry·Michael D Fayer, Nancy E Levinger
Apr 3, 2012·The Journal of Chemical Physics·Heejae KimMinhaeng Cho
Aug 17, 2012·The Journal of Chemical Physics·Jordi CireraFrancesco Paesani
Feb 17, 2011·The Journal of Chemical Physics·G HeinzelmannM Girardi
Jun 24, 2014·The Journal of Chemical Physics·Michał MajMinhaeng Cho
Feb 16, 2016·Journal of the American Chemical Society·Santanu RoyJames L Skinner
Oct 6, 2015·The Journal of Physical Chemistry. B·Rongfeng YuanMichael D Fayer
Feb 9, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Sungnam Park, Minbiao Ji
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Nov 21, 2014·The Journal of Physical Chemistry. a·Joseph Kabrane, Adelia J A Aquino
Jan 31, 2015·The Journal of Physical Chemistry. B·Chiara H GiammancoMichael D Fayer
Oct 3, 2014·The Journal of Physical Chemistry. B·Nancy Singhal, Anindya Datta
Aug 18, 2016·The Journal of Physical Chemistry. B·Michał MajMinhaeng Cho
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Mar 28, 2009·Journal of the American Chemical Society·Emily E FennMichael D Fayer
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Nov 6, 2018·The Journal of Chemical Physics·N F BunkinS V Gudkov
Apr 24, 2020·The Journal of Chemical Physics·Steven A YamadaMichael D Fayer

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