Process for operating a fuel cell in dry conditions

Details Process for operating a fuel cell in dry conditions Process for operating a fuel cell in dry conditions

H - Electricity

01

M

H01M 8/10 (2006.01) C08J 5/22 (2006.01) H01M 8/04 (2006.01)

Patent

CA 2673069

The invention pertains to a process for operating a polymer electrolyte membrane fuel cell (PEMFC), said PEMFC comprising:(a) a membrane comprising at least one fluorinated ionomer [polymer (I)] comprising recurring units derived from tetrafluoroethylene (TFE) and from at least one monomer of formula (M): wherein m is an integer between 1 and 6 and X' is chosen among halogens (Cl, F, Br, I), -O-M+, wherein M+ is a cation selected among H+, NH4 +, K+, Li+, Na+or mixtures thereof, said polymer (I) having an equivalent weight (EW) of from 700 to 850 g/eq.; (b) a cathode; (c) an anode; said process comprising: (i) feeding gaseous reactants at the electrodes at a relative humidity of at most 66 %; (ii) maintaining an average current density between 0.05 and 1.5 A/cm2; and(iii) maintaining an average temperature of more than 65 °C.

L'invention concerne un procédé destiné à actionner une pile à combustible à membrane électrolytique polymère (PEMFC), ladite PEMFC comprenant :(a) une membrane comprenant au moins un ionomère fluoré [polymère (I)] comprenant des unités récurrentes issues d'un tétrafluoroéthylène (TFE) et d'au moins un monomère de formule (M) : où m est un entier entre 1 et 6 et X' est choisi parmi des halogènes (Cl, F, Br, I), -O-M+, où M+ est un cation choisi parmi H+, NH4 +, K+, Li+, Na+ ou des mélanges de ceux-ci, ledit polymère (I) ayant un poids équivalent (EW) de 700 à 850 g/eq; (b) une cathode; (c) une anode; ledit procédé comprenant les opérations consistant à : (i) alimenter des réactifs gazeux au niveau des électrodes à une humidité relative d'au plus 66 %; (ii) maintenir une densité de courant moyenne entre 0,05 et 1,5 A/cm2; et (iii) maintenir une température moyenne de plus de 65 °C.

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