SANS investigation of accelerated stress test of fuel cell electrode membrane assembly
A polymer electrolyte membrane fuel cell for the automotive application must deliver high performance under various operating conditions. However, the operation under unsteady conditions results in degradation of fuel cell materials, particularly the electrode membrane assembly (MEA). Understanding degradation mechanisms of fuel cell components is a key to the commercialization. In the proposed experiment, the MEA of the fuel cell will be investigated with small angle neutron scattering (SANS) during accelerated stress tests (ASTs). We will study how relative humidity and potential cycling impact the water management in the operando fuel cell. The ionomer peak (Q~0.1 and 0.25 A-1) will be tracked for quantifying water uptake in the ionomer, while the total water content can be deduced from incoherent scattering (Q~0.5 to 1 A-1) or transmission. Additionally, reference quartz pocket cells, coated with catalyst inks, will be investigated with and without (heavy) water for calibration. The calibration data will be incorporated to the operando results to improve the accuracy of water measurements.
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MORIN Arnaud; GEBEL Gerard; Jongmin Lee; LYONNARD Sandrine; MICOUD Fabrice and PORCAR Lionel. (2019). SANS investigation of accelerated stress test of fuel cell electrode membrane assembly. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-160
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