Patent ID: 7258778
Filing Date: 2007-08-21
Classification: C25B,Y02E

Abstract:
1. A process for the production of an electrolytic electrode having an electrocatalytic coating thereon, said electrocatalytic coating having reduced amounts of platinum group metal oxides while maintaining coating durability, said process comprising the steps of: providing a valve metal electrode base; coating said valve metal electrode base with a coating layer of an electrochemically active coating on said valve metal electrode base, said coating comprising a uniform mixture of platinum group metal oxides, and optionally, a valve metal oxide in an amount not greater than 25 mole percent, basis 100 mole percent of the metal content of the coating, said mixture of platinum group metal oxides consisting essentially of ruthenium oxide and iridium oxide in a proportion providing from at least about 5 mole percent up to about 50 mole percent ruthenium, and at least about 50 mole percent up to about 95 mole percent iridium, basis 100 mole percent of these metals present in the coating; wherein said ruthenium oxide and iridium oxide are present in a molar proportion of from about 1:1 to about 1:4 and wherein said electrochemically active coating is applied in an amount from about 0.2 g/m