DOI QR코드

DOI QR Code

Current Sensing Atomic Force Microscopy Study of the Morphological Variation of Hydrated Pronton Exchange Membrane

Current Sensing Atomic Force Microscopy를 이용한 PEM의 수화 현상에 따른 모폴로지 변화 연구

  • 권오성 (계명대학교 교양교육대학) ;
  • 이상철 (DGIST 웰니스 융합 연구센터) ;
  • 손병락 (DGIST 웰니스 융합 연구센터) ;
  • 이동하 (DGIST 웰니스 융합 연구센터)
  • Received : 2014.07.02
  • Accepted : 2014.08.11
  • Published : 2014.08.30

Abstract

A proton exchange membrane is a core component in the proton exchange membrane fuel cell because the role of proton exchange membrane(PEM)is supplying proton conductivity to fuel cell, a gas separator, and insulating between an anode and cathode. Among various role of PEM, supplying proton conductivity is the most important and the proton conductivity is strongly related the structural evolution of PEM by hydration. Thus a lot of studies have done by past few decade based on small angle X-ray scattering and wide angle X-ray scattering for understanding morphological structure of the PEM. Resulting from these studies, several morphological models of hydrated PEM are proposed. Current sensing atomic force microscopy (CSAFM) can map morphology and conductance on the membrane simultaneously. It can be the best tool for studying heterogenous structured materials such as PEM. In this study, the hydration of the membrane is examined by using CSAFM. Conductance and morphological images are simultaneously mapped under different relative humidity. The conductance images, which are mapped from different relative humidity, are analyzed by statistical methode for understanding ionic channel variation in PEM.

Acknowledgement

Supported by : 대구경북과학기술원

References

  1. Mauritz, K. A. et al., State of Understanding of Nafion, Chemical Reviews. Vol. 104, pp. 4535-4583, 2004 https://doi.org/10.1021/cr0207123
  2. Hsu, W. Y. et al., Ion Transport and Clustering in Nafion Perfluorinated Membranes, Journal of Membrane Science Vol. 13, pp. 307-326, 1983 https://doi.org/10.1016/S0376-7388(00)81563-X
  3. Fujimura, M. et al., Small-angle x-ray Scattering Study of Perfluorinated Ionomer Membranes. 1. Origin of two scattering maxima Micromolecules Vol. 14, pp. 1309-1315, 1981 https://doi.org/10.1021/ma50006a032
  4. Klaus, S.-R., Parallel cylindrical water nano channels in Nafionfuel-cell membranes, Nature Materials Vol. 7, pp. 75-83, 2008 https://doi.org/10.1038/nmat2074
  5. NAFION(R) Technical Information on Membranes, available from http://ion-power.com/German/oldsite/nafion/naf-101.html; internet, accessed 1 May 2014
  6. Gebel, G. Structural evolution of water swollen perfluorosulfonated ionomers from dry membrane to solution, Polymer Vol. 41, pp. 5829-5838, 2000 https://doi.org/10.1016/S0032-3861(99)00770-3