Partially Fluorinated Aarylene Polyethers and their Ternary Blends with PBI and H3PO4. Part II. Characterisation and Fuel Cell Tests of the Ternary Membranes
| Autor: | Qingfeng Li, Andreas Chromik, Chao Pan, M. S. Nilsson, Jochen Kerres, Frank Schönberger, Martin Hein, Niels J. Bjerrum, Jens Oluf Jensen, Viktor Bandur, Thomas Häring |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Condensation polymer Renewable Energy Sustainability and the Environment Arylene Proton exchange membrane fuel cell Energy Engineering and Power Technology Electrolyte chemistry.chemical_compound Membrane Chemical engineering chemistry Ultimate tensile strength Polymer chemistry Ternary operation Phosphoric acid |
| Zdroj: | Fuel Cells. 8:374-374 |
| ISSN: | 1615-6854 1615-6846 |
| DOI: | 10.1002/fuce.200890014 |
| Popis: | Ternary blend membranes based on sulphonated partially fluorinated arylene polyether, polybenzimidazole (PBI) and phosphoric acid were prepared and characterised as electrolyte for high temperature proton exchange membrane fuel cells. Partially fluorinated arylene polyether was first prepared from polycondensation of decafluorobiphenyl with 2,2-bis(4-hydroxyphenyl)hexafluoropropane, followed by sulphonation with H2SO4/60% SO3, based on which binary blends with PBI were prepared and further doped with concentrated phosphoric acid at temperatures of up to 130 °C. Acid doping levels as high as 10–13 mol phosphoric acid per PBI repeat unit can be reached, showing small swelling and excellent mechanical strength. At an acid doping level of 11, a conductivity of 0.12 S cm–1 was obtained at 175 °C and 10% relative humidity. Such a membrane exhibits a tensile strength of 6 MPa, elongation of 220% and modulus of 50 MPa at 150 °C. Based on these ternary membranes large MEAs with an active area of 256 cm2 have been prepared for a 2 kWel stack showing good performance and reproducibility. |
| Databáze: | OpenAIRE |
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