Production of catalyst layers on membranes for...

Details Production of catalyst layers on membranes for... Production of catalyst layers on membranes for...

H - Electricity

01

M

H01M 4/88 (2006.01) H01M 8/10 (2006.01) H01M 4/92 (2006.01)

Patent

CA 2389213

The invention relates to a method for applying catalytically active material to a polymer membrane for low temperature fuel cells. According to the invention, a nonpolar solvent, a catalytically active material and a polymer solution are processed into a paste. This paste is then applied to the membrane in the form of a layer, especially by screen printing. The paste is then dried and pressed onto the membrane, heat being supplied. The use of nonpolar solvents prevents swellings from forming in the membrane. It is therefore possible to produce the desired product with only a few processing steps. Material losses are minimised by using the screen-printing technique. The method is therefore economical and simple overall.

L'invention concerne un procédé permettant d'appliquer une matière à action catalytique sur une membrane polymère pour cellules électrochimiques à basse température. Selon l'invention, un solvant homopolaire, une matière à action catalytique et une solution polymère sont travaillés pour former une pâte. Ladite pâte est appliquée par couches, notamment par sérigraphie, sur la membrane. Pour finir, la pâte est séchée et est compactée conjointement avec la membrane sous apport de chaleur. L'utilisation de solvants homopolaires évite les phénomènes de gonflement de la membrane, ce qui permet d'obtenir le produit voulu avec peu d'étapes de traitement. L'utilisation de la technique sérigraphique permet de minimiser les pertes de matière.

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