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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.7: Poster
Wednesday, April 2, 2014, 15:00–19:00, P3
Structure and Dynamics of High-temperature Polymer Electrolyte Fuel Cells investigated by Neutron Scattering — •Bernhard Hopfenmüller1, Oxana Ivanova1, Olaf Holderer1, Wiebke Maier2, Werner Lehnert2, Reiner Zorn3, and Michael Monkenbusch3 — 1JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ , Garching, Germany — 2IEK-3, Forschungszentrum Jülich GmbH , Jülich, Germany — 3JCNS-1 & ICS, Forschungszentrum Jülich GmbH, Germany
High-temperature polymer electrolyte fuel cells based on (poly(2,2'-(m-phenylene)-5,5'-bibenzimidazole) membranes (PBI) with phosphoric acid impregnation are a new promising material for high-temperature polymer electrolyte fuel cells (HT-PEFCs). Their operating temperatures are above the boiling point of water. PBI membranes show good chemical resistance and high glass transition temperature (about 700 K). After being loaded with phosphoric acid (PA) such membranes provide very good proton conductivity (~80mS/cm at 140°C), which increases with an increasing amount of PA in the system [1,2] Different neutron scattering techniques, including back scattering, small-angle-neutron-scattering or time-of-flight-scattering are practical to investigate structure and dynamics in these systems. We will present results obtained from such measurements.
[1] C. Wannek, W. Lehnert, J. Mergel, J. Power Sources 192 (2009) 258. [2] Q. F. Li, J. O. Jensen, R. F. Savinell, N. J. Bjerrum, Progress in Polymer Science 34 (2009) 449.