Fuel cell manufacturing method and fuel cell having a...

H - Electricity – 01 – M

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H01M 8/12 (2006.01) H01M 4/86 (2006.01) H01M 4/88 (2006.01) H01M 4/94 (2006.01)

Patent

CA 2546791

The manufacturing method of the invention is applied to manufacture a unit fuel cell 20, which has a hydrogen-permeable metal layer 22 of a hydrogen- permeable metal and an electrolyte layer 21 that is located on the hydrogen- permeable metal layer 22 and has proton conductivity. The method first forms the electrolyte layer 21 on the hydrogen-permeable metal layer 22, and subsequently forms an electrically conductive cathode 24 on the electrolyte layer 21 to block off an electrical connection between the cathode 24 and the hydrogen-permeable metal layer 22. The method releases Pd toward the electrolyte layer 21 in a direction substantially perpendicular to the electrolyte layer 21 to form a Pd layer as the cathode 24 that is thinner than the electrolyte layer 21. This arrangement of the invention effective prevents a potential short circuit, for example, between the cathode and the hydrogen- permeable metal layer, in the fuel cell, due to pores present in the electrolyte layer.

L'invention concerne un procédé pour produire une pile à combustible unitaire (20) présentant une couche métallique (22) perméable à l'hydrogène et une couche d'électrolyte (21) qui est située sur cette dernière (22) et qui présente une conductivité protonique. Ce procédé consiste tout d'abord à former la couche d'électrolyte (21) sur la couche métallique (22) perméable à l'hydrogène, puis à former une cathode électroconductrice (24) sur la couche d'électrolyte (21) pour empêcher une connexion électrique entre la cathode (24) et la couche métallique (22). Ce procédé permet la libération de plomb vers la couche d'électrolyte (21) dans une direction sensiblement perpendiculaire à la couche d'électrolyte (21) pour former une couche de plomb servant de cathode (24), plus fine que la couche d'électrolyte (21). Cette conception empêche efficacement un court-circuit potentiel, par exemple entre la cathode et la couche métallique perméable à l'hydrogène, dans la pile à combustible, en raison de la présence de pores dans la couche d'électrolyte.

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