Durable electrode coatings
AssigneeThe Dow Chemical Company
InventorYu-Min Tsou
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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.
Claims6
An electrode for use in electrochemical reactions comprising (1) an electrically conducting, electrocatalytically inert metal substrate or a non-metallic substrate having an electrically conducting, electrocatalytically inert metallic surface thereon and (2) an electrocatalytically active coating consisting of:
- A) a porous, dendritic, heterogeneous, electrocatalytically active primary phase coating on said substrate having a substantial internal surface area comprising a platinum group metal matrix in admixture with a particulate material,
- B) a secondary phase intermediate coating comprising a water insoluble, adhesion promoting polymer having a nitrogen-containing functional group and an electroless metal plating catalyst;
- and
- C) an outer phase metal reinforcement coating comprising a transition metal or alloy thereof.
Dependencies are inferred from the claim text.