Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM)
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 t...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2012-06-01
|
| Series: | Membranes |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2077-0375/2/2/237 |
| _version_ | 1797764150727802880 |
|---|---|
| author | Emil Roduner Norbert Wagner Steffen Hink Wolfgang G. Bessler |
| author_facet | Emil Roduner Norbert Wagner Steffen Hink Wolfgang G. Bessler |
| author_sort | Emil Roduner |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T19:51:39Z |
| format | Article |
| id | doaj.art-09611a60849e4cbf8d10cb2f8bb850e7 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-12T19:51:39Z |
| publishDate | 2012-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-09611a60849e4cbf8d10cb2f8bb850e72023-08-02T03:05:12ZengMDPI AGMembranes2077-03752012-06-012223725210.3390/membranes2020237Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM)Emil RodunerNorbert WagnerSteffen HinkWolfgang G. BesslerSpatially 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.http://www.mdpi.com/2077-0375/2/2/237Nafion membraneelectrochemical AFMimpedance spectroscopysingle pore proton flux |
| spellingShingle | Emil Roduner Norbert Wagner Steffen Hink Wolfgang G. Bessler Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM) Membranes Nafion membrane electrochemical AFM impedance spectroscopy single pore proton flux |
| title | Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM) |
| title_full | Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM) |
| title_fullStr | Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM) |
| title_full_unstemmed | Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM) |
| title_short | Impedance Spectroscopic Investigation of Proton Conductivity in Nafion Using Transient Electrochemical Atomic Force Microscopy (AFM) |
| title_sort | impedance spectroscopic investigation of proton conductivity in nafion using transient electrochemical atomic force microscopy afm |
| topic | Nafion membrane electrochemical AFM impedance spectroscopy single pore proton flux |
| url | http://www.mdpi.com/2077-0375/2/2/237 |
| work_keys_str_mv | AT emilroduner impedancespectroscopicinvestigationofprotonconductivityinnafionusingtransientelectrochemicalatomicforcemicroscopyafm AT norbertwagner impedancespectroscopicinvestigationofprotonconductivityinnafionusingtransientelectrochemicalatomicforcemicroscopyafm AT steffenhink impedancespectroscopicinvestigationofprotonconductivityinnafionusingtransientelectrochemicalatomicforcemicroscopyafm AT wolfganggbessler impedancespectroscopicinvestigationofprotonconductivityinnafionusingtransientelectrochemicalatomicforcemicroscopyafm |