Next Article in Journal / Special Issue
Synthesis, Multinuclear NMR Characterization and Dynamic Property of Organic–Inorganic Hybrid Electrolyte Membrane Based on Alkoxysilane and Poly(oxyalkylene) Diamine
Previous Article in Journal
Comparison of Polytetrafluoroethylene Flat-Sheet Membranes with Different Pore Sizes in Application to Submerged Membrane Bioreactor
Previous Article in Special Issue
Oxygen Selective Membranes for Li-Air (O2) Batteries
Article Menu

Export Article

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

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

1
Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany
2
Institute of Technical Thermodynamics, German Aerospace Center, Pfaffenwaldring 38-40, Stuttgart D-70569, Germany
*
Author to whom correspondence should be addressed.
Received: 25 April 2012 / Revised: 25 May 2012 / Accepted: 29 May 2012 / Published: 6 June 2012
(This article belongs to the Special Issue Membranes for Electrochemical Energy Applications)
View Full-Text   |   Download PDF [648 KB, uploaded 6 June 2012]   |  

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. View Full-Text
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 (CC BY 3.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

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.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Membranes EISSN 2077-0375 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top