Abstract
The electrical power consumption in aircraft will increase significantly in the next generations of aircraft. The use of fuel cells in aircrafts allows a more environmentally friendly generation of electrical energy with a higher efficiency than the present electrical power generator in aircraft. Fuel cells in aircrafts will be operated under special conditions and in particular the low pressures conditions are of interest. For this purpose at the DLR test facilities for polymer electrolyte membrane fuel cells (PEFC) have been built-up and first experiments under low pressure conditions were performed. For a better understanding of the electrochemical behaviour, a single cell was operated at various pressures and the electrochemical performance was investigated in combination with locally resolved current density distribution measurements. Under low-pressure conditions the water balance in the fuel cell is the crucial factor to explain fuel cell performance.
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