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Membranes 2012, 2(2), 237-252; doi:10.3390/membranes2020237
Article

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

1
, 2
, 2
 and 1,*
Received: 25 April 2012; in revised form: 25 May 2012 / Accepted: 29 May 2012 / Published: 6 June 2012
(This article belongs to the Special Issue Membranes for Electrochemical Energy Applications)
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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.
Keywords: Nafion membrane; electrochemical AFM; impedance spectroscopy; single pore proton flux Nafion membrane; electrochemical AFM; impedance spectroscopy; single pore proton flux
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Hink, S.; Wagner, N.; Bessler, W.G.; Roduner, E. Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM). Membranes 2012, 2, 237-252.

AMA Style

Hink S, Wagner N, Bessler WG, Roduner E. Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM). Membranes. 2012; 2(2):237-252.

Chicago/Turabian Style

Hink, Steffen; Wagner, Norbert; Bessler, Wolfgang G.; Roduner, Emil. 2012. "Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM)." Membranes 2, no. 2: 237-252.


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