Chemistry: electrical current producing apparatus – product – and – Having earth feature
Reexamination Certificate
2005-02-15
2005-02-15
Ryan, Patrick (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Having earth feature
C429S006000, C429S047000
Reexamination Certificate
active
06855453
ABSTRACT:
The invention is a fuel cell (20) having a corrosion resistant and protected cathode catalyst layer (24). The cathode catalyst layer (24) includes a platinum oxygen reduction catalyst and an oxygen evolution catalyst selected from the group consisting of catalysts that are more active than platinum for oxygen evolution. The oxygen evolution catalyst may be uniformly applied within the cathode catalyst layer, or non-uniformly applied to identified high corrosion areas (82) (84) of the cathode catalyst layer (24). The cathode catalyst layer (24) may include heat-treated carbon support material, and/or a heat-treated carbon black within a diffusion layer (40) supporting the cathode catalyst layer (24). The fuel cell (20) may also include an anode catalyst layer (22) having a poor oxygen reduction catalyst having a greater oxygen reduction over potential than platinum.
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Ioroi, Kitazawa, Yasuda, Yamamoto and Takenaka; Iridium Oxide/Platinum Electrocatalysts for Unitized Regenerative Polymer Electrolyte Fuel Cells: Journal of the Electrochemical Society; 147, at pp. 2018-2002 (2000).
Bett John A. S.
Breault Richard D.
Cipollini Ned E.
Jarvi Thomas D.
Chisholm, Jr. Malcolm J.
Parsons Thomas H
Ryan Patrick
UTC Fuel Cells LLC
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