The Dow Chemical Company

Richard N Beaver, Deceased

John R Pimlott

Yu-Min Tsou

James W McMichael

Stephen L Kelly

Harry S Burney, Jr

Charles W Becker

Carl E Byrd, Deceased

Gordon E Newman

A pressurized or forced circulation electrolysis cell comprising a cell housing containing at least one pair of electrodes which is a cathode and an anode, a current collector and an ion exchange membrane having a surface area of at least about 40 ft.sup.2 having the improvement which comprises an electrically conductive, hydraulically permeable resilient mattress substantially coplanar with and contacting on one side the current collector and coplanar with and contacting on the other side an electrode. The mattress comprises at least six non-aligned layers of woven and crimped metal fibers having a resiliency product of greater than 100 (inches).sup.2 /psi according to the formula:

Mattress for electrochemical cells

A membrane-electrode structure for use in an electrochemical cell comprising an ion exchange membrane with a cathode layer and several intermediate layers between the cathode and the membrane. The intermediate layers comprises at least two layers or zones of inorganic solid particles and an organic polymer binder. The intermediate layer or zone adjacent to the membrane comprises more than 50% by weight of inorganic particles and the other layers or zones have 50% by weight or less of inorganic particles.

Membrane-electrode structure for electrochemical cells

In an electrolyzer system having metallic supply and discharge piping subjected to shunt currents, the improvement which comprises a removable target electrode in the section of said piping subjected to said shunt currents, said target electrode having a lower overvoltage than the metallic piping being protected.

Target electrode for preventing corrosion in electrochemical cells

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.

Growing community of inventors

Angleton, TX, United States of America

Richard N Beaver, Deceased