State of water in nafion 117 proton exchange membranes studied by dielectric relaxation spectroscopy

Georgios Polizos, Zijie Lu, Digby D. Macdonald, Evangelos Manias

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The dynamics and the nature of water environments in a fuel cell proton exchange membrane are studied experimentally. Specifically, the dynamics of water in Nafion 117 membranes, in the acid form, were investigated at two hydration levels and several temperatures by means of dielectric relaxation spectroscopy; two different dielectric spectroscopy experimental setups were employed for low (10-2-107 Hz, 25 to -80°C) and microwave (0.045-26 GHz, 35°C) frequency ranges. Three states of water were clearly identified: (a) water strongly bound to the sulfonic groups (in quantitative agreement with previous investigations) defining the first hydration layer; (b) loosely bound water, surrounding the first layer, and (c) free water, having similar dynamics as in the bulk/liquid water. This is the first time that the dynamics of loosely bound water are experimentally observed.

Original languageEnglish (US)
Title of host publicationSolid-State Ionics-2006
Pages131-136
Number of pages6
Volume972
StatePublished - 2007
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 27 2006Dec 1 2006

Other

Other2006 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period11/27/0612/1/06

Fingerprint

Dielectric relaxation
Protons
Ion exchange
Spectroscopy
Membranes
Water
Hydration
Dielectric spectroscopy
perfluorosulfonic acid
Proton exchange membrane fuel cells (PEMFC)
Microwaves
Acids
Liquids

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials

Cite this

Polizos, G., Lu, Z., Macdonald, D. D., & Manias, E. (2007). State of water in nafion 117 proton exchange membranes studied by dielectric relaxation spectroscopy. In Solid-State Ionics-2006 (Vol. 972, pp. 131-136)
Polizos, Georgios ; Lu, Zijie ; Macdonald, Digby D. ; Manias, Evangelos. / State of water in nafion 117 proton exchange membranes studied by dielectric relaxation spectroscopy. Solid-State Ionics-2006. Vol. 972 2007. pp. 131-136
@inproceedings{ad685aff60b94cb096745d460547587d,
title = "State of water in nafion 117 proton exchange membranes studied by dielectric relaxation spectroscopy",
abstract = "The dynamics and the nature of water environments in a fuel cell proton exchange membrane are studied experimentally. Specifically, the dynamics of water in Nafion 117 membranes, in the acid form, were investigated at two hydration levels and several temperatures by means of dielectric relaxation spectroscopy; two different dielectric spectroscopy experimental setups were employed for low (10-2-107 Hz, 25 to -80°C) and microwave (0.045-26 GHz, 35°C) frequency ranges. Three states of water were clearly identified: (a) water strongly bound to the sulfonic groups (in quantitative agreement with previous investigations) defining the first hydration layer; (b) loosely bound water, surrounding the first layer, and (c) free water, having similar dynamics as in the bulk/liquid water. This is the first time that the dynamics of loosely bound water are experimentally observed.",
author = "Georgios Polizos and Zijie Lu and Macdonald, {Digby D.} and Evangelos Manias",
year = "2007",
language = "English (US)",
isbn = "1558999299",
volume = "972",
pages = "131--136",
booktitle = "Solid-State Ionics-2006",

}

Polizos, G, Lu, Z, Macdonald, DD & Manias, E 2007, State of water in nafion 117 proton exchange membranes studied by dielectric relaxation spectroscopy. in Solid-State Ionics-2006. vol. 972, pp. 131-136, 2006 MRS Fall Meeting, Boston, MA, United States, 11/27/06.

State of water in nafion 117 proton exchange membranes studied by dielectric relaxation spectroscopy. / Polizos, Georgios; Lu, Zijie; Macdonald, Digby D.; Manias, Evangelos.

Solid-State Ionics-2006. Vol. 972 2007. p. 131-136.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - State of water in nafion 117 proton exchange membranes studied by dielectric relaxation spectroscopy

AU - Polizos, Georgios

AU - Lu, Zijie

AU - Macdonald, Digby D.

AU - Manias, Evangelos

PY - 2007

Y1 - 2007

N2 - The dynamics and the nature of water environments in a fuel cell proton exchange membrane are studied experimentally. Specifically, the dynamics of water in Nafion 117 membranes, in the acid form, were investigated at two hydration levels and several temperatures by means of dielectric relaxation spectroscopy; two different dielectric spectroscopy experimental setups were employed for low (10-2-107 Hz, 25 to -80°C) and microwave (0.045-26 GHz, 35°C) frequency ranges. Three states of water were clearly identified: (a) water strongly bound to the sulfonic groups (in quantitative agreement with previous investigations) defining the first hydration layer; (b) loosely bound water, surrounding the first layer, and (c) free water, having similar dynamics as in the bulk/liquid water. This is the first time that the dynamics of loosely bound water are experimentally observed.

AB - The dynamics and the nature of water environments in a fuel cell proton exchange membrane are studied experimentally. Specifically, the dynamics of water in Nafion 117 membranes, in the acid form, were investigated at two hydration levels and several temperatures by means of dielectric relaxation spectroscopy; two different dielectric spectroscopy experimental setups were employed for low (10-2-107 Hz, 25 to -80°C) and microwave (0.045-26 GHz, 35°C) frequency ranges. Three states of water were clearly identified: (a) water strongly bound to the sulfonic groups (in quantitative agreement with previous investigations) defining the first hydration layer; (b) loosely bound water, surrounding the first layer, and (c) free water, having similar dynamics as in the bulk/liquid water. This is the first time that the dynamics of loosely bound water are experimentally observed.

UR - http://www.scopus.com/inward/record.url?scp=34250854544&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34250854544&partnerID=8YFLogxK

M3 - Conference contribution

SN - 1558999299

SN - 9781558999299

VL - 972

SP - 131

EP - 136

BT - Solid-State Ionics-2006

ER -

Polizos G, Lu Z, Macdonald DD, Manias E. State of water in nafion 117 proton exchange membranes studied by dielectric relaxation spectroscopy. In Solid-State Ionics-2006. Vol. 972. 2007. p. 131-136