High-temperature polymer electrolyte fuel membrane electrode assemblies

Wannek C, Lehnert W, Mergel J (2009) Membrane electrode assemblies for high-temperature polymer electrolyte fuel cells based on poly (2,5-benzimidazole) membranes with phosphoric acid impregnation via the catalyst layer. J Power Sources 192 258-266... 

J. (2009) Membrane electrode assemblies for high-temperature polymer electrolyte fuel cells based... 

Wannek, C., Konradi, I., Mergel, J., and Lehnert, W. (2009) Redistribution of phosphoric acid in membrane electrode assemblies for high temperature polymer electrolyte fuel cells. Int.J. Hydrogen Energy, 23, 9479. 

Lee H-J, Kim BG, Lee DH et al (2011) Demonstration of a 20 W class high-temperature polymer electrolyte fuel cell stack with novel fabrication of a membrane electrode assembly. Int J Hydrogen Energy 36 5521-5526... 

The aforementioned polymeric electrolytes have been effectively used in polymer electrolyte fuel cells operating up to In order to study the single cell performance and apart from the high ionic conductivity of the membrane, several parameters residing the MEA constmction must be taken into account in order to have optimum performance of the cell. Some of these parameters are the amount of the catalyst the ionomer-binder used at the electrodes and its percentage, electrode surface and the preparation method, pressure and the temperature of the MEA assembling and design and constmction parameters of the cell. ... 

Abstract The world s first highly durable perfluorinated polymer-based membrane electrode assembly (MEA) for polymer electrolyte membrane fuel cells, under conditions of high temperature and low humidity, has been developed. The newly developed MEA, which is composed of a new perfluorinated polymer composite membrane, reduces the degradation rate to 1/lOOth to l/l,000th of that of the conventional MEA. The new perfluorinated polymer composite MEA can be operated for more than 6,000h at 120°C and 50% relative humidity. 

HBP-SA, HBP-SA-Ac, HBP-PA and HBP-PA-Ac polymers, interpenetrated electrolyte membrane HBP-SA-co-HBP-Ac, and the crosslmked membranes CL-HBP-SA and CL-HBP-PA showed the VTF-type temperature dependence. These polymers and membranes are thermally stable up to 260 °C, and they had suitable thermal stability as an electrolyte in the polymer electrolyte fuel cell operating under non-humidified conditions. Fuel cell measurement using a single membrane electrode assembly cell with crosslinked membranes CL-HBP-SA and CL-HBP-PA was successfully performed under non-humidified conditions, and polarization curves were observed. The concept of the proton conduction coupled with the polymer chain motion was proposed as one possible approach toward high temperature fuel cells. 

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