Integral fuel cell electrode and matrix and a method for manufacturing same
OwnerHiroshi Kato, Ichiro Komadainventors
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Abstract
An integrally molded, combined fuel cell electrode and matrix is provided having a matrix layer containing 3 to 20 weight percent polytetrafluoroethylene (PTFE) and 80 to 97 weight percent inorganic powder, the matrix being integral with an electrode layer of PTFE containing a catalyst. The electrode layer preferably is 40 to 90 weight percent of electrically conductive fine powder, on which the catalyst has been supported, and 10 to 60 weight percent PTFE. Also provided is a method for manufacture of the integral fuel cell electrode and matrix of the invention.
Claims14
An integrally molded fuel cell electrode and matrix comprising:
- (a) a matrix layer containing 3 to 20 weight percent PTFE and 80 to 97 weight percent inorganic powder integrally formed on one side of
- (b) an electrode layer of PTFE containing a catalyst, wherein said matrix layer contains carbon fine powder and has integrally formed, on its side opposite said electrode layer, a layer of PTFE containing a second inorganic powder which possesses electrical insulating properties.
An integrally molded fuel cell electrode and matrix comprising:
- (a) a matrix layer containing 3 to 20 weight percent PTFE and 80 to 97 weight percent inorganic powder integrally formed on one side of
- (b) an electrode layer of PTFE containing a catalyst,
- wherein said matrix layer has a second counter electrode layer of PTFE containing a catalyst integrally formed on the second side of said matrix layer opposite said electrode layer.
A method for manufacturing an integrally molded fuel cell electrode and matrix comprising:
- (a) (i) forming a catalyst layer element which contains PTFE and a catalyst, (ii) forming a matrix composition layer element adjacent said catalyst layer element which contains 3 to 20 weight percent PTFE and 80 to 97 percent inorganic powder, prepared as elements whose thicknesses are greater than the thicknesses of the respective layers in the desired finished product, and whose thicknesses are in accordance with a ratio determined from the thickness ratio of the respective layers in said finished product, and (iii) forming a third layer element adjacent said matrix layer, on its side opposite said electrode layer, the third layer comprising PTFE containing a second inorganic powder which possesses electrical insulating properties, and
- (b) laminating said elements together by rolling so that said elements are reduced to their final thicknesses and simultaneously formed into an integral body.
Dependencies are inferred from the claim text.