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State of Water in Nafion 117 Proton Exchange Membranes Studied by Dielectric Relaxation Spectroscopy

Published online by Cambridge University Press:  26 February 2011

Georgios Polizos ,
Zijie Lu ,
Digby D Macdonald  and
Evangelos Manias
Georgios Polizos
Affiliation:
manias@psu.edu, Pennsylvania State University, Materials Scienc and Engineering, Steidle Building, University Park, PA, 16802, United States
Zijie Lu
Affiliation:
zul100@psu.edu, Penn State University, Materials Sci & Eng, University Park, PA, 16802, United States
Digby D Macdonald
Affiliation:
macdonald@matse.psu.edu, Penn State University, Materials Sci & Eng, University Park, PA, 16802, United States
Evangelos Manias
Affiliation:
manias@psu.edu, Penn State University, Materials Sci & Eng, University Park, PA, 16802, United States
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Abstract

Dynamics of water in Nafion 117 membranes, in the acid form, at two hydration levels and several temperatures were investigated by means of dielectric relaxation spectroscopy in both, low (10−2 to 107 Hz, 25 to −80 °C) and microwave (0.045-26 GHz, 35 °C) frequency regions by employing different experimental setups. Three states of water were identified: a) strongly bound to the sulfonic groups (in agreement with other investigations) forming the first hydration layer; b) loosely bound, surrounding the first layer and c) free water, having similar dynamics as in the bulk state.

Keywords

dielectricpolymerionic conductor
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA08-07
Copyright
Copyright © Materials Research Society 2007

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References

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