| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Leclerc, Sébastien
Université de Lorraine
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2019Single-crystal X-ray diffraction study, NMR and electrochemical analysis of a copper(i) 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis-[(6-methyl-2,2′-bipyridyl-6-yl)methoxy]calix[4]arene complex: an original M4L2 “hand-to-hand” systemcitations
- 2018Characterization of Nafion ®XL properties after ex-situ and in-situ degradations
- 2017A Multitechnique Characterization of Lignin Softening and Pyrolysiscitations
- 2008Modeling of gas transport in a microporous solid using a slice selection procedure: Application to the diffusion of benzene in ZSM5citations
Places of action
| Organizations | Location | People |
|---|
conferencepaper
Characterization of Nafion ®XL properties after ex-situ and in-situ degradations
Abstract
International audience ; Among the different PEMFC components the electrolyte membrane is still the object of many studies as its degradation remains a limiting factor of its durability. Quantities of work have focused on the impact of chemical damages due radical attacks leading to the scission of the polymer chains [1, 2]. Recent studies have pointed out the combined effect of mechanical and chemical stressors on the PEM properties [3] and it was demonstrated that the compression level imposed on the membrane changes the microstructure and accelerates the chemical decomposition of the polymer. A set of experimental techniques are available to characterize the membranes properties after degradation, including EIS (proton conductivity), water sorption, scattering methods (microstructure), IR, Raman and 19 F-NMR spectroscopy (chemical structure) or DMA (mechanical behavior). These methods are complementary, and it is usually necessary to combined several of them to obtain an accurate description of the membrane properties. Ultimately, the experimental data are analyzed and correlated to understand the link between the chemical structure, the microstructure and the transport properties. In the present study we investigated the link between the changes observed in the chemical structure and the evolution of the water sorption and transport properties in the composite Nafion XL membrane after degradation in controlled conditions (ex-situ Fenton tests) and after long term fuel cell operation in the field. We used a multi-characterization approach, combining 19 F-NMR and IRTF spectroscopy, water sorption and 1 H-pulsed field NMR to quantify the changes observed in the chemical structure and the evolution of the water sorption and diffusion. The IR measurements demonstrate a heterogeneous chemical degradation between the anode and the cathode side (Figure 1) while the 19 F data show a decrease of the IEC after both ex-situ and in-situ degradation. This loss of IEC, mainly due to side chain scissions, is correlated to ...