AMADEus Seminar - Pr. Jannis Kallitsis - Tuesday 13 September 2016 - 10:00 am ENSCBP (Amphi 1 - Bât A)13/09 : 10h - 11h
J. K. Kallitsis
Department of Chemistry, University of Patras, Rio-Patras, Greece
Foundation for Research and Technology Hellas, Institute of Chemical Engineering Sciences (FORTH/ICE-HT), Patras, Greece
Increasing the operation Temperature in High Temperature Polymer Electrolyte Membrane Fuel Cells through Crosslinking
Abstract: High temperature polymer electrolyte membranes containing basic units that are able to interact with strong protic acids providing ionically conductive composite membrane have shown respectable performance and long operational stability. Further increase of the operation temperature and even an increase on the obtained conductivity values would facilitate the construction of efficient systems providing both electricity and heat, increasing thus the total efficiency.
Initial attempts1,2,3 to stabilize the HTPEM electrolyte membranes through covalent crosslinking have proven that the operation temperature can be shifted up to 220oC. Different crosslinking methodologies have been tested to stabilize either PBI or aromatic polyethers bearing pyridine units. Here we focused on the optimization of the crosslinking methodology using side double bonds and we also develop new crosslinking methodologies leading to wholly aromatic crosslinked structures. Different type of crosslinkers have been used, controlling thus the acid doping ability of the final membranes while the use of dopable crosslinkers that enable the high acid uptake and retention. Moreover, depending on the chemical structure of the crosslinked membranes, a significant increase of the conductivity values of the final acid doped composite membranes was obtained.
1. K.D. Papadimitriou, F. Paloukis, S.G. Neophytides, J.K. Kallitsis
Macromolecules 2011, 44 (12), 4942-4951
2. C.I. Morfopoulou, A.K. Andreopoulou, M.K. Daletou, S.G. Neophytides, J.K. Kallitsis
Journal of Materials Chemistry A 2013, 1 (5), 1613-1622
3. K.D. Papadimitriou, M. Geormezi, S.G. Neophytides, J.K. Kallitsis
Journal of Membrane Science 2013, 433, 1-9