Chemistry: electrical and wave energy – Processes and products
Patent
1991-04-17
1993-07-13
Niebling, John
Chemistry: electrical and wave energy
Processes and products
204128, C25B 116, C25B 1500
Patent
active
052270300
ABSTRACT:
Cathodes useful in an electrolytic cell, such as a chlor-alkali cell, are disclosed which have a metallic-surfaced substrate coated with a catalytic coating composition. In one aspect, the catalytic coating includes a base layer of at least one primary electrocatalytic metal with particles of at least one electrocatalytic metal oxide entrapped therein. In another aspect, at least one upper oxide layer is formed on the base layer. Each upper oxide layer includes a substantially heterogeneous mixture of at least one primary electrocatalytic metal oxide and at least one secondary electrocatalytic metal oxide. The catalytic coatings are tightly adherent to the underlying substrate, resist loss during cell operation and exhibit low hydrogen overvoltage potentials. Disclosed are methods for preparing the above-described cathodes. Also disclosed is a method for reducing the hydrogen overvoltage potential of an electrolytic cell by placing an electrocatalytic metal/metal oxide particle coating on a metallic-surfaced cathode.
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Beaver, deceased Richard N.
Becker Charles W.
Byrd, deceased Carl E.
Kelly Stephen L.
Gorgos Kathryn
Niebling John
The Dow Chemical Company
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