Appeal 2007-0128
Reexamination Control 90/006,208
Patent 5,573,648
electrode structure, uniform application of the electrode layer,
reduction in the formation of gas bubbles at the membrane/electrode
interface and without adversely effecting the strength, dimensional
stability or electrical properties of the membrane. Unlike prior art
membranes the suspension medium reduces the viscosity of the ink,
suspends or dissolves the polymer but does not interact with the
functional groups of the polymer which may reduce the ionic
conductivity of the membrane and electrode structure.
(Id. at col. 4, ll. 15-29).
19) Grot’s electrode contains catalytically active particles and binders. (Grot,
col. 3, line 60 to col. 4, line 14).
20) Grot states that NAFIONŽ is a preferred binder. (Id.).
21) Grot describes its catalytically active particles as follows:
The electrode layer can be made from well-known catalytically active
particles or materials. The anode is preferably formed by one or more
platinum group metal such as platinum, ruthenium, rhodium, and
iridium and electroconductive oxides thereof, and electroconductive
reduced oxides thereof. The cathode is preferably formed by one or
more of iron, nickel, stainless steel, a thermally decomposed product
of a fatty acid nickel salt, Raney nickel, stabilized Raney nickel,
carbonyl nickel and carbon powder supporting a platinum group
metal. The catalyst may be supported or unsupported. The preferred
catalyst is a platinum catalyst (manufactured by Precious Metals
Corp.), particularly 20% platinum on a carbon support known as
VULCAN7 (manufactured by Cabot Corp.).
13
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