Fuel cell and method for moistening the electrolyte

Details Fuel cell and method for moistening the electrolyte Fuel cell and method for moistening the electrolyte

H - Electricity

01

M

H01M 8/04 (2006.01)

Patent

CA 2142090

Abstract In the case of fuel cells having an electrolyte which conducts oxygen ions,, hydroxide ions or protons, the problem fundamentally exists of moistening the air of the combustion gases in order to prevent the electrolyte drying out or thinning and thus to prevent defective operation of the fuel cell during air operation. In this case, the design and financial cost, in particular, for moistening of the air is of concern. In order to avoid this disadvantage, it is provided according to the invention that exhaust gas, which occurs on the cathode side, of the fuel cell is at least partially recirculated into the cathode of the fuel cell. In consequence, the water content of the electro- lyte can be set within wide limits by simple adjustment of the recirculated exhaust-gas quantity. In consequence, economical use of the PEM fuel cell becomes possible. The invention can be used in principle for all fuel cells having an electrolyte which conducts oxygen ions, hydroxide ions or protons. FIG 1

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