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Title: Method of making membrane-electrode assemblies for electrochemical cells and assemblies made thereby

A method is described for making a combination, unitary, membrane and electrode assembly having a solid polymer electrolyte membrane, and first and second electrodes at least partially embedded in opposed surfaces of the membrane. The electrodes each comprise a respective group of finely divided carbon particles, very finely divided catalytic particles supported on internal and external surfaces of the carbon particles and a proton conductive material intermingled with the catalytic and carbon particles. A first group of finely divided carbon particles forming the first electrode has greater water attraction and retention properties, and is more hydrophilic than a second group of carbon particles forming the second electrode. In a preferred method, the membrane electrode assembly of the invention is prepared by forming a slurry of proton conductive material and at least one group of the carbon and catalyst particles. The slurry is applied to the opposed surfaces of the membrane and heated while being pressed to the membrane for a time and at a temperature and compressive load sufficient to embed at least a portion of the particles into the membrane. 10 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
7200141
Assignee:
General Motors Corp., Detroit, MI (United States) CHO; EDB-94-100829
Patent Number(s):
US 5316871; A
Application Number:
PPN: US 8-102189
Contract Number:
AC02-90CH10435
Resource Relation:
Patent File Date: 5 Aug 1993
Research Org:
General Motors Corp
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; ELECTRODES; FABRICATION; SOLID ELECTROLYTE FUEL CELLS; CARBON; CATALYSTS; ELECTRIC-POWERED VEHICLES; IMPREGNATION; MEMBRANES; DIRECT ENERGY CONVERTERS; ELECTROCHEMICAL CELLS; ELEMENTS; FUEL CELLS; NONMETALS; VEHICLES; 300503* - Fuel Cells- Materials, Components, & Auxiliaries