Solid polymer electrolyte fuel cell

A solid polymer electrolyte fuel cell comprising:

• a solid polymer electrolyte membrane;
• an anode and a cathode sandwiching said solid polymer electrolyte membrane therebetween;
• an anode-side conductive separator plate having a gas flow path for supplying a fuel gas to said anode;
• and
• a cathode-side conductive separator plate having a gas flow path for supplying an oxidant gas to said cathode,
• wherein said anode-side and cathode-side conductive separator plates are formed of a metal whose surface is covered with a coat having resistance to oxidation and whose surfaces facing the anode and the cathode have portions which lack said coat and are electrically connected to the anode and the cathode, respectively, through conductive particles interposed between said separator plate and the anode and between said separator plate and the cathode.

A solid polymer electrolyte fuel cell comprising:

• a solid polymer electrolyte membrane;
• an anode and a cathode sandwiching said solid polymer electrolyte membrane therebetween;
• an anode-side conductive separator plate having a gas flow path for supplying a fuel gas to said anode;
• and
• a cathode-side conductive separator plate having a gas flow path for supplying an oxidant gas to said cathode,
• wherein each of said anode-side and cathode-side conductive separator plates is composed of a spongy metal and a carbon powder layer which is filled into said spongy metal and coated on a surface of said spongy metal.

A solid polymer electrolyte fuel cell comprising:

• a solid polymer electrolyte membrane;
• an anode and a cathode sandwiching said solid polymer electrolyte membrane therebetween;
• an anode-side conductive separator plate having a gas flow path for supplying a fuel gas to said anode;
• and
• a cathode-side conductive separator plate having a gas flow path for supplying an oxidant gas to said cathode,
• wherein each of said anode-side and cathode-side conductive separator plates is composed of a metal and a conductive coat which has resistance to oxidation and covers a surface of the metal,
• wherein said conductive coat is selected from the group consisting of a carbonaceous coat, a metal-plated coat containing particles of a water repellent material, and a conductive inorganic compound coat wherein the conductive inorganic compound is selected from the group consisting of Sn(In)O2, PbO, PbO2, and inorganic carbides.