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Electrochemical atomic force microscopy study of proton conductivity in a Nafion membrane

Aleksandrova, Elena and Hiesgen, Renate and Friedrich, Kaspar Andreas and Roduner, Emil (2007) Electrochemical atomic force microscopy study of proton conductivity in a Nafion membrane. Physical Chemistry Chemical Physics (PCCP), 9 (21), pp. 2737-2741. Royal Society of Chemistry Publishing. DOI: 10.1039/b617516c ISSN 1463-9076

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High membrane conductivity is one of the key parameters in polymer electrolyte fuel cell applications. We introduce an electrochemical atomic force microscopy method that provides simultaneously the surface topography of a Nafion 112 membrane and the conductivity of ion channels with an unprecedented resolution of ca. 10 nm. For given conditions, a large fraction of the channel ports is found to conduct exactly the same number of protons per unit time. This is taken as evidence for an optimum pore size and structure for proton conduction, or alternatively, for an efficient connectivity of the ion channel network, so that the same conductivity is measured at all exit pores. The time response following a potential step and the influence of the relative humidity on the transport properties is investigated. The method will be of relevance for tailoring the production technology to yield an optimised micromorphology, and it permits detailed tests of membrane models and provides data for theoretical modelling of proton conductivity.

Item URL in elib:https://elib.dlr.de/51582/
Document Type:Article
Title:Electrochemical atomic force microscopy study of proton conductivity in a Nafion membrane
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Aleksandrova, ElenaUniversität StuttgartUNSPECIFIED
Hiesgen, RenateHochschule EsslingenUNSPECIFIED
Roduner, EmilUniversität StuttgartUNSPECIFIED
Date:7 June 2007
Journal or Publication Title:Physical Chemistry Chemical Physics (PCCP)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1039/b617516c
Page Range:pp. 2737-2741
Publisher:Royal Society of Chemistry Publishing
Keywords:Nafion, proton conductivity, atomic force microscopy
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E BZ - Fuel cells (old)
DLR - Research area:Energy
DLR - Program:E BZ - Fuel cells
DLR - Research theme (Project):E - Membran-Brennstoffzellen (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:08 Oct 2007
Last Modified:27 Apr 2009 14:25

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