Oxygen generating electrode

Details Oxygen generating electrode Oxygen generating electrode

1993-03-10

1994-03-15

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

4271263, 4271265, 429 44, C25B 1100

Patent

active

052943178

ABSTRACT:
An oxygen generating electrode has on a conductive substrate a first layer of metallic platinum and tantalum oxide containing 80-99 mol% of Ta and 20-1 mol% of Pt, a second layer of iridium oxide and tantalum oxide containing 80-99.9 mol% of Ir and 20-0.1 mol% of Ta, and preferably a third layer of iridium oxide and tantalum oxide containing 40-79.9 mol% of Ir and 60-20.1 mol% of Ta. In another embodiment, the first layer consists of iridium oxide and tantalum oxide and contains 14-8.4 mol% of Ir and 86-91.6 mol% of Ta. The electrode, when used as an anode in electrolysis with concomitant oxygen generation, can be used for an extended period at a low bath voltage. It is adapted for electrolysis at a high current density of more than 100 A/cm.sup.2 since it maintains mechanical strength and has a long effective life. It experiences a minimal change of oxygen overvoltage with time.

REFERENCES:
patent: 4481097 (1984-11-01), Asano et al.
patent: 4502936 (1985-03-01), Hayfield
patent: 4707229 (1987-11-01), Dempsey et al.
patent: 5156726 (1992-10-01), Nakada et al.

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