Method of making electrodes for electrochemical fuel cells

H - Electricity – 01 – M

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H01M 4/04 (2006.01)

Patent

CA 2575452

In preparing a fluid diffusion electrode, typical methods include applying a catalyst ink to a fluid diffusion layer, drying the catalyst ink and hot- pressing the coated fluid diffusion layer to produce a fluid diffusion electrode. In the present application, unexpected improvements in the smoothness of the resulting electrode have been observed by drying the catalyst ink during compaction. To assist with drying the catalyst layer, the compacting step may be performed at elevated temperatures. In some embodiments, a release sheet may be applied to the catalyst layer prior to compaction. In addition or alternatively, partial drying of the catalyst layer may occur prior to compaction.

Pour élaborer une électrode de diffusion de fluide, des procédés typiques consistent à appliquer une encre catalytique à une couche de diffusion de fluide, à sécher l~encre catalytique et à presser à chaud la couche de diffusion de fluide déposée pour produire une électrode de diffusion de fluide. Dans la présente application, on a observé des améliorations inattendues dans le lissé de l~électrode résultante en séchant l~encre catalytique pendant le compactage. Pour faciliter le séchage de la couche catalytique, la phase de compactage peut être réalisée à des températures élevées. Dans certains modes de réalisation, on peut appliquer une feuille détachable à la couche catalytique avant le compactage. En plus ou en alternative, il peut y avoir un séchage partiel de la couche catalytique avant le compactage.

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