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Atomic force microscopy studies of conductive nanostructures in solid polymer electrolytes

Hiesgen, Renate and Helmly, Stefan and Morawietz, Tobias and Yuan, Xiao-Zi and Wang, Haijiang and Friedrich, K. Andreas (2013) Atomic force microscopy studies of conductive nanostructures in solid polymer electrolytes. Electrochimica Acta, 110, pp. 292-305. Elsevier. DOI: 10.1016/j.electacta.2013.04.147 ISSN 0013-4686

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Abstract

tThe conductivity of three different sulfonated polymer electrolyte membranes (PEM), two perfluori-nated membranes, Nafion® and Aquivion®, and JST, a non-perfluorinated aromatic block copolymer, werecompared using advanced material-sensitive and conductive atomic force microscopy (AFM). All of themembranes required activation by a current flow to reach significant conductivity for the AFM analysis,indicating the existence of a highly resistive surface skin layer. The two perfluorinated sulfonic acid mem-branes, a membrane with long side-chains (Nafion®) and a membrane with short side-chains Aquivion®),exhibited similar properties. A lamellar surface structure, with polymer bundles or micelles in a parallelorientation, was also found for the Aquivion®membrane. AFM high-resolution current images, per-formed under a continuous current flow, were used to distinguish between the conducting network andthe subsurface phase distribution at the membrane surface. The connected subnets of the JST membrane were approximately 100–200 nm in size, whereas those for the perfluorinated membrane surfaceswere 200–300 nm in size. The conductive areas of the Aquivion®and JST membranes exhibited largerhomogeneous conducting areas, corresponding to the smaller correlation lengths of ionic phase separa-tion. Membrane cross sections were analyzed to elucidate the structure of the bulk ionic network of theNafion®membrane, before and after operation. The existence of extended water layers in the bulk, evenbefore operation, was confirmed.

Item URL in elib:https://elib.dlr.de/85206/
Document Type:Article
Title:Atomic force microscopy studies of conductive nanostructures in solid polymer electrolytes
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hiesgen, RenateHochschule EsslingenUNSPECIFIED
Helmly, Stefanstefan.helmly (at) dlr.deUNSPECIFIED
Morawietz, TobiasHochschule EsslingenUNSPECIFIED
Yuan, Xiao-Zi National Research Council CanadaUNSPECIFIED
Wang, HaijiangNational Research Council CanadaUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:2013
Journal or Publication Title:Electrochimica Acta
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:110
DOI :10.1016/j.electacta.2013.04.147
Page Range:pp. 292-305
Publisher:Elsevier
ISSN:0013-4686
Status:Published
Keywords:AFM Current Aquivion® Block-copolymer Nanostructure
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:11 Nov 2013 15:04
Last Modified:06 Sep 2019 15:16

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