H - Electricity – 01 – M
Patent
H - Electricity
01
M
H01M 4/96 (2006.01) H01M 4/88 (2006.01) H01M 8/10 (2006.01) H01M 8/04 (2006.01)
Patent
CA 2081063
There is provided a combination, unitary, membrane and electrode assembly with a solid polymer electrolyte membrane, and first and second electrodes at least partially embedded in opposed surfaces of the membrane. The method leads to a very significant increase in catalyst utilization. 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 water retention properties and is relatively more hydrophilic and less hydrophobic 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 finely divided carbon particles and very finely divided catalytic particles supported on and in the carbon 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 to thereby form a membrane electrode assembly.
Mikhail Youssef Morcos
Swathirajan Sundararajan
General Motors Corporation
Gowling Lafleur Henderson Llp
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