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US 5,882,723 AGranted
Durable electrode coatings
AssigneeThe Dow Chemical Company
InventorYu-Min Tsou
Life of this patent
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Abstract
Durable electrolytic cell electrodes having low hydrogen overpotential and performance stability. A highly porous electrocatalytic primary phase and an outer, secondary phase reinforcement coating are provided on an electrically conducting transition metal substrate to make the electrodes. Durability is achieved by the application of the outer secondary phase to protect the primary phase electrocatalytically active coating. A process is also disclosed for catalizing a substrate surface to promote electroless deposition of a metal.
Claims7
A process for preparing an electrocatalytic electrode coating on a substrate comprising:
- (A) contacting at least one surface of an electrically conductive, electrocatalytically inert metallic substrate or a non-metallic substrate having an electrically conductive electrocatalytically inert metallic coating thereon with a fluid medium comprising at least one water or aqueous acid soluble compound of a platinum group metal in admixture with a dispersion containing particles of a particulate material to form a porous, dendritic, heterogeneous, electrocatalytically active primary coating on said substrate;
- and
- (B) augmenting the adhesion of the porous primary coating form in step (A) to the substrate, comprising:
- (i) applying an intermediate coating comprising a water insoluble, adhesion promoting polymer having a nitrogen-containing functional group and a catalyst precursor compound for electroless metal plating;
- (ii) reducing said catalyst precursor compound in step (B)(i) to form a metal catalyst by contact with a reducing agent;
- and
- (iii) applying an outer coating comprising a transition metal or alloy thereof.
4 more elements
Dependencies are inferred from the claim text.