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Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM)

Hink, Steffen and Wagner, Norbert and Bessler, Wolfgang G. and Roduner, Emil (2012) Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM). Membranes, 2, pp. 237-252. Multidisciplinary Digital Publishing Institute (MDPI). DOI: doi:10.3390/membranes2020237 ISSN 2077-0375

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Abstract

Spatially resolved impedance spectroscopy of a Nafion polyelectrolyte membrane is performed employing a conductive and Pt-coated tip of an atomic force microscope as a point-like contact and electrode. The experiment is conducted by perturbing the system by a rectangular voltage step and measuring the incurred current, followed by Fourier transformation and plotting the impedance against the frequency in a conventional Bode diagram. To test the potential and limitations of this novel method, we present a feasibility study using an identical hydrogen atmosphere at a well-defined relative humidity on both sides of the membrane. It is demonstrated that good quality impedance spectra are obtained in a frequency range of 0.2–1,000 Hz. The extracted polarization curves exhibit a maximum current which cannot be explained by typical diffusion effects. Simulation based on equivalent circuits requires a Nernst element for restricted diffusion in the membrane which suggests that this effect is based on the potential dependence of the electrolyte resistance in the high overpotential region.

Item URL in elib:https://elib.dlr.de/75930/
Document Type:Article
Title:Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hink, Steffens.hink (at) ipc.uni-stuttgart.deUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Bessler, Wolfgang G.wolfgang.bessler (at) dlr.deUNSPECIFIED
Roduner, EmilUniversität StuttgartUNSPECIFIED
Date:June 2012
Journal or Publication Title:Membranes
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:2
DOI :doi:10.3390/membranes2020237
Page Range:pp. 237-252
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2077-0375
Status:Published
Keywords:PEMFC Impedanzspektroskopie AFM Protonenleitfähigkeit
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E EV - Energy process technology (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: Wagner, Dr.rer.nat. Norbert
Deposited On:18 Jun 2012 15:19
Last Modified:21 Sep 2019 05:05

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