Electrolysis cathode and method for producing electrolysis cathode

Patent metadata

Field	Value
Publication number	US-2017198402-A1
Application number	US-201515316733-A
Country	US
Kind code	A1
Filing date	Jul 14, 2015
Priority date	Jul 15, 2014
Publication date	Jul 13, 2017
Grant date	—

Abstract

Provided is an economical cathode for electrolysis in which the amount of expensive cathode catalyst component used in a base is effectively reduced, without damaging the performance of the cathode, and an increase in the amount of cathode catalyst consumed due to long-term electrolysis can be prevented.
A cathode for electrolysis and a simple method for manufacturing the cathode for electrolysis are provided. The cathode for electrolysis includes a conductive base, which is, for example, a wire mesh, includes a plurality of intersection portions, and is made of nickel and a cathode catalyst layer that includes a catalyst component, such as platinum, and is formed by applying an application liquid to the base and dying and solidifying the application liquid. A solidified portion of a liquid pool of the application liquid is not formed in the intersection portion of the base, or even if the solidified portion is formed, the cross-sectional shape of the solidified portion has mesh-shaped pores and the average porosity of the solidified portion is equal to or greater than 15%. In the method for manufacturing the cathode for electrolysis, the base is preheated to 43° C. to 120° C. immediately before the application liquid is applied, and thereafter the cathode catalyst layer is formed.

First claim

1 . A cathode for electrolysis comprising:
a conductive cathode base that is a wire mesh, expanded metal or perforated metal, the wire mesh having a plurality of intersection portions between linear or strip-shaped members, the expanded metal and the perforated metal having right-angled or acute portions of holes as a plurality of intersection portions; and a cathode catalyst layer that includes a cathode catalyst component and is formed by an application method which applies an application liquid including a starting material of the cathode catalyst component to at least one surface of the conductive cathode base, and dries and bakes the applied application liquid, wherein the cathode catalyst component includes at least one selected from platinum, iridium, ruthenium, palladium, osmium, nickel, and oxides thereof, the conductive cathode base is made of nickel or nickel alloy, a solidified portion of a liquid pool is not generated in the intersection portion of the conductive cathode base, or even if the solidified portion is generated, a cross-sectional shape of the solidified portion has mesh-shaped pores and the average porosity of the solidified portion is equal to or greater than 15%.

2 . The cathode for electrolysis according to claim 1 ,
wherein the average porosity is equal to or greater than 44%.

3 . The method for manufacturing the cathode for electrolysis according to claim 1 , comprising:
a cathode catalyst layer forming step for forming a cathode catalyst layer including the cathode catalyst the step comprising: applying an application liquid including a starting material of a cathode catalyst component to at least one surface of a conductive cathode base that is the wire mesh, the expanded metal or the perforated metal, the wire mesh having a plurality of intersection portions between linear or strip shaped members, the expanded metal and the perforated metal haying right-angled or acute portions of holes as a plurality of intersection portions; and thereafter drying and baking the application liquid applied to the base; the applying step, the drying step and the baking step being performed one time or plurality of times, wherein the cathode catalyst component includes at least one selected from platinum, iridium, ruthenium, palladium, osmium, nickel, and oxides thereof, the conductive cathode base is made of nickel or nickel alloy, and in the cathode catalyst layer forming step, the conductive cathode base is heated such that the temperature of the conductive cathode base immediately before the application liquid is applied one or more times is in the range of 43° C. to 120° C.

4 . The method for manufacturing the cathode for electrolysis according to claim 3 ,
wherein, in the cathode catalyst layer forming step, a means for preheating the conductive cathode base is provided on an upstream side of the step of applying the application liquid, the series of the applying step of the application liquid, the drying and baking step of drying and baking the application liquid applied to the base is repeated a plurality of times, and whenever the steps are repeated, the conductive cathode base is heated by the preheating means such that the temperature of the conductive cathode base immediately before the application liquid is applied is in the range of 43° C. to 120° C.

5 . The method for it manufacturing the cathode for electrolysis according to claim 3 ,
wherein the conductive cathode base is heated such that the temperature of the conductive cathode base immediately before the application liquid is applied is in the range of 43° C. to 63° C.

6 . The method for manufacturing the cathode for electrolysis according to claim 3 ,
wherein the application liquid is an acid.

Assignees

• De Nora Permelec Ltd

Inventors

• Takeuchi Atsumi

Classifications

• B01J23/755

  Nickel · CPC title

• C25B11/03 Primary

  perforated or foraminous · CPC title

• B05D3/0254

  After-treatment · CPC title

• B01J23/40

  of the platinum group metals · CPC title

• C25B11/0415

  Chemistry & Metallurgy · mapped topic