Fuel cell

a fuel cell and cell technology, applied in the field of fuel cells, can solve the problems of decreased durability, achieve the effects of reducing voltage, preventing contamination of cooling medium, and reducing corrosion curren
US20050142416A1Inactive Publication Date: 2005-06-30HONDA MOTOR CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
HONDA MOTOR CO LTD
Publication Date
2005-06-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides a fuel cell having a layered structure, including: a membrane electrode assembly having a fuel electrode, an oxidation electrode, and an electrolyte membrane held between the fuel electrode and the oxidation electrode; and stainless steel separators holding the membrane electrode assembly therebetween. The stainless steel separator contains Cr and Fe; the Cr concentration by mass % by mass ratio of Cr to Fe at the separator surface facing the fuel electrode is from 0.7 to 1.3; and the Cr concentration by mass % by mass ratio of Cr to Fe at the separator surface facing the oxidation electrode is less than 0.7.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a fuel cell, and in particular relates to a solid polymer electrolyte fuel cell.

[0003] 2. Description of the Related Art

[0004] In a fuel cell in which a polymer electrolyte is used, electric power and heat are simultaneously generated by an electrochemical reaction of a fuel gas containing hydrogen gas and an oxidizing gas containing oxygen gas or air. The fuel cell basically has a polymer electrolyte membrane for selectively transporting hydrogen ions, and a pair of electrodes, that is, an anode electrode and a cathode electrode formed on both surfaces of the polymer electrolyte membrane. The electrode generally consists of a catalytic layer formed on a surface of the polymer electrolyte membrane layer and a gas-diffusion layer formed on an outside surface of the catalyst layer. The catalyst layer is mainly composed of a carbon powder supporting a platinum group metal catalyst. Th...

Claims

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