Chemistry: electrical current producing apparatus – product – and – Having earth feature
Patent
1994-10-12
1996-06-04
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Having earth feature
429 41, H01M 492, H01M 486
Patent
active
055231772
ABSTRACT:
A direct methanol fuel cell (DMFC) contains a membrane electrode assembly (MEA) including an anode porous electrode structure which can operate on a liquid or vapor methanol/water feed in the absence of a liquid electrolyte such as sulfuric acid, a proton-exchange membrane electrolyte, and a porous gas-diffusion cathode. The anode porous electrode structure includes a three-dimensional reduced (Pt--Ru)O.sub.x catalyst particle-ionomer composite structure, whereby the ionomer coats the individual particles and provides a mechanism for continuous proton transport throughout the composite structure, eliminating the need for a liquid acidic electrolyte. The partially reduced (Pt--Ru)O.sub.x particles are individually ionomer coated prior to anode fabrication. The anode porous electrode structure is subsequently bonded to one side of a thin sheet of a solid proton-conducting ionomer membrane and a cathode structure bonded to the opposite side of the membrane, to form a MEA. Insertion of the MEA into appropriate hardware results in fuel cell fabrication.
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Cropley Cecelia C.
Kosek John A.
LaConti Anthony B.
Chaney Carol
Giner, Inc.
Kalafut Stephen
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