Patent ID: 7556878

Claim:
A fuel cell, comprising, a first separator plate; a second separator plate joined to the first separator plate to form a chamber between the joined separator plates, the second separator plate having a mounting hole to fix a solid electrolyte layer and the mounting hole extending through a surface of the second separator plate facing the first separator plate; and a porous pyroelectric member in the chamber, the porous pyroelectric member including a first density part and a second density part having a higher density than that of the first density part and the second density part comprising a plurality of ribs in a surface of the porous pyroelectric member; wherein the second density part is connected to the first separator plate and at least two opposing sides of the second density part are in contact with the first density part; and wherein at least one of the first separator plate and the second separator plate comprises a plurality of ribs joined to the plurality of ribs of the porous pyroelectric member, each of the plurality of ribs of the porous pyroelectric member pre-formed in the surface of the porous pyroelectric member for alignment with the plurality of ribs of the at least one of the first separator plate and the second separator plate.