Method and apparatus for forming catalyst layer on base...

H - Electricity – 01 – M

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H01M 4/88 (2006.01) B05C 19/00 (2006.01) B05D 1/04 (2006.01) B05D 1/28 (2006.01) H01M 2/14 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2555086

In an apparatus A in which electrode powder 10 is allowed to adhere via the electrostatic force to an electrolyte membrane that serves as a substrate 2 so as to form a catalyst layer, a screen 5 is held in a state of non-contact with the substrate 2, and a voltage is applied therebetween. The electrode powder 10 is allowed to adhere to an elastic feed roller 7, and the feed roller 7 is allowed to rotate in contact with the screen 5 by pressure The electrode powder 10 is dispersed toward the substrate 2 so as to stably adhere thereto via both the electrostatic force and the extruding force of the elastic body. Variation of thickness and collapse of the outline are extremely reduced on the catalyst layer to be transferred and formed on the substrate (electrolyte membrane) via the electrostatic force using a conventionally used mesh-like screen so as to obtain a membrane electrode assembly with a high product manufacturing accuracy

Appareil (A) servant à former une couche de catalyseur par électrodéposition d'une poudre d'électrode (10) sur un film électrolyte servant de base (2). On maintient un tamis (5) hors de contact de la base (2) et on applique une tension entre ceux-ci. On fait en sorte que la poudre de l'électrode (10) adhère à un cylindre d'alimentation élastique (7) et on fait tourner le cylindre d'alimentation (7) en contact par pression avec le tamis (5). La poudre de l'électrode (10) vole vers la base (2) à cause de la force électrostatique et de la force d'extrusion du corps élastique et adhère de façon stable. Tout en utilisant un tamis ressemblant à un tamis à mailles classiquement utilisé, on peut diminuer de façon extrêmement importante les variations de l'épaisseur de la couche de catalyseur transféré et formé sur et par-dessus la base (film électrolyte) par la force électrostatique et des variations de contour, produisant de cette manière un assemblage électrode membrane ayant une grande précision de fabrication du produit.

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