Catalyst support for an electrochemical fuel cell

B - Operations – Transporting – 01 – J

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B01J 27/22 (2006.01) B01J 21/18 (2006.01) B01J 23/40 (2006.01) B01J 37/08 (2006.01) H01M 4/88 (2006.01) H01M 4/92 (2006.01) H01M 4/96 (2006.01)

Patent

CA 2570992

Corrosion of the carbon catalyst support may occur at both the anode and cathode catalyst layers within an electrochemical fuel cell. Such corrosion may lead to reduced performance and/or decreased lifetimes of the fuel cell. Nevertheless, carbon supports have many desirable properties as catalyst supports including high surface area, high electrical conductivity, good porosity and density. To reduce or eliminate corrosion of the carbon catalyst support, the carbon support may have a metal surface treatment and, in particular, a metal carbide surface treatment. Suitable metal carbides include titanium, tungsten and molybdenum. In this manner, the metal carbide surface treatment protects the underlying carbon support from corrosion while maintaining the desirable characteristics of the carbon support.

La corrosion du support catalyseur de carbone peut avoir lieu à la fois au niveau des couches de catalyse de l'anode et de la cathode au sein d'une pile à combustible électrochimique. Une telle corrosion peut entraîner une réduction des performances et/ou des durées de vie de la pile à combustible. Ceci dit, les supports de carbone possèdent beaucoup de propriétés souhaitables comme supports catalyseurs, y compris une zone de surface élevée, une forte conductivité électrique, de bonnes porosité et densité. Afin de réduire ou d'éliminer la corrosion du support catalyseur de carbone, celui-ci peut être soumis à un traitement de surface au métal et, plus particulièrement, à un traitement de surface au carbide de métal, notamment les carbides de métal appropriés comprennent le titane, le tungstène et le molybdène. Ainsi, le traitement de surface au carbide de métal protège le support de carbone sous-jacent de la corrosion tout en préservant les caractéristiques souhaitables de ce support.

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