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Anisotropic conductivity over in-plane and thickness directions in nafion-117

Journal of the Electrochemical Society, ISSN: 0013-4651, Vol: 153, Issue: 12
2006
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  • Citations
    69
    • Citation Indexes
      69
  • Captures
    87
  • Social Media
    42
    • Shares, Likes & Comments
      42
      • Facebook
        42

Article Description

Proton conductivity of Nafion-117 membranes in the direction of thickness was measured in 30°C, 30-90% relative humidity, by means of 2- and 4-probe methods in thickness direction developed in this group. Heavy conductivity anisotropy of in-plane thickness =2.5-5 was found over the in-plane and thickness directions for membranes pretreated by hot-pressing at high temperature of 150°C and pressures of 1200 and 600 kgf cm2, respectively. On the other hand, no conductivity fade was found for membrane pretreated at 0 kgf cm2 in the thickness direction compared to that in the plane direction. Small angle X-ray scattering measurements revealed ion domains flattened along the in-plane direction and ordered along the thickness direction. The origin of the persistent conductivity anisotropy is believed to come from the maximized potential energy barrier for ion transport in interaggregate along the thinned thickness direction.The Electrochemical Society © 2006 The Electrochemical Society.

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