Manufacturing method for electrolyte membrane including noble metal particles, electrolyte membrane including noble metal particles, membrane electrode assembly, electrochemical cell, stack, and electrolyzer

Patent metadata

Field	Value
Publication number	US-2024102190-A1
Application number	US-202318462942-A
Country	US
Kind code	A1
Filing date	Sep 7, 2023
Priority date	Sep 20, 2022
Publication date	Mar 28, 2024
Grant date	—

Abstract

A manufacturing method for a electrolyte membrane including noble metal particles according to an embodiment includes a step of impregnating cationic noble metal complex ions with a first region of a surface of a cation exchange membrane by spraying solution containing the cationic noble metal complex ions on the cation exchange membrane and drying the sprayed member, and a step of applying a reducing treatment to the cation exchange membrane impregnated with the cationic noble metal complex ions.

First claim

What is claimed is:

1 . A manufacturing method for electrolyte membrane including noble-metal particles comprising:
impregnating cationic noble metal complex ions with a first region of a surface of a cation exchange membrane by spraying solution containing the cationic noble metal complex ions on the cation exchange membrane and drying the sprayed member; and applying a reducing treatment to the cation exchange membrane impregnated with the cationic noble metal complex ions.

2 . The manufacturing method according to claim 1 , wherein the cationic noble metal complex ion includes one or more kinds of ions of noble metals selected from the group consisting of Pt, Re, Rh, Ir, Pd, and Ru and a neutral molecule as a ligand.

3 . The manufacturing method according to claim 2 , wherein the neutral molecule is NH 3 or amine.

4 . The manufacturing method according to claim 1 , wherein the spraying and the drying are performed alternately and repeatedly.

5 . The manufacturing method according to claim 1 , wherein hot air at 30 [° C.] or more and 120 [° C.] or less is applied to the cation exchange membrane in the impregnating the cationic noble metal complex ions.

6 . The manufacturing method according to claim 1 , wherein a concentration of the cationic noble metal complex ion in the solution containing the cationic noble metal complex ion is 0.05 [wt %] or more and 5 [wt %] or less.

7 . The manufacturing method according to claim 1 , wherein the cation exchange membrane impregnated with the cationic noble metal complex ions is immersed in a reducing solution in the applying the reducing treatment.

8 . The manufacturing method according to claim 1 , wherein the cation exchange membrane impregnated with the cationic noble metal complex ions is treated in an atmosphere of heated hydrogen gas in the applying the reducing treatment.

9 . An electrolyte membrane including noble metal particles comprising:
a cation exchange membrane having a first surface which is a main surface; and noble metal particles on the first surface side excluding a peripheral region of the cation exchange membrane.

10 . The electrolyte membrane according to claim 9 , wherein
the noble metal particles are particles including one or more kinds of noble metal elements selected from the group consisting of Pt, Re, Rh, Ir, Pd, and Ru, an average circumscribed circle diameter of the noble metal particles is 0.5 [nm] or more and 1000 [nm] or less, and the amount of the noble metal particles included on the first surface side of the cation exchange membrane is 0.01 [mg/cm 2 ] or more and 1 [mg/cm 2 ] or less.

11 . The electrolyte membrane according to claim 9 , wherein the cation exchange membrane has sulfonic acid groups.

12 . A membrane electrode assembly comprising:
a first electrode including a first support and a first catalyst layer on the first support; a second electrode includes a second support and a catalyst layer on the second support; and the electrolyte membrane according to claim 9 .

13 . An electrochemical cell comprising:
the membrane electrode assembly according to claim 12 .

14 . A stack comprising:
the membrane electrode assembly according to claim 12 .

15 . An electrolyzer comprising:
the stack according to claim 14 .

Assignees

• Toshiba Kk
• Toshiba Energy Systems & Solutions Corp

Inventors

• Nakano Yoshihiko
• Yoshinaga Norihiro

Classifications

• C25B13/05 Primary

  based on inorganic materials · CPC title

• C25B13/08

  based on organic materials · CPC title

• C25B9/19

  with diaphragms · CPC title

• C25B9/23 Primary

  comprising ion-exchange membranes in or on which electrode material is embedded · CPC title

• C25B13/04

  characterised by the material · CPC title