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- W2071669336 abstract "Cold-starts of a polymer electrolyte fuel cell (PEFC), isothermally maintained at various subfreezing temperatures, were visualized using high resolution dynamic in-plane neutron imaging. The results obtained aim to bring new knowledge about the water accumulation mechanisms leading to the voltage drop usually observed in isothermal mode after a given working time, also called voltage failure. In particular, the data presented should be useful for comparison to simulation predictions provided by modeling studies. As main result, water in a condensed phase was observed to accumulate not only in the membrane-electrode-assembly (MEA), but also in the cathode gas diffusion layer (GDL) at −15°C and even in the cathode gas channels at −10°C. Moreover, approximately 400 cold-starts were realized without neutron imaging and revealed stochastic distributions of working times. The presence of water in super-cooled state is discussed and finally retained as only valid explanation of the results obtained. Additionally, the sudden freezing of super-cooled water is thought to cause the rapid water accumulation observed in the MEA during the voltage failure." @default.
- W2071669336 created "2016-06-24" @default.
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- W2071669336 date "2011-01-01" @default.
- W2071669336 modified "2023-10-01" @default.
- W2071669336 title "Cold-Start of a PEFC Visualized with High Resolution Dynamic In-Plane Neutron Imaging" @default.
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- W2071669336 doi "https://doi.org/10.1149/2.085202jes" @default.
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