Laminated electrolyte membrane, membrane electrode assembly, water electrolysis cell, stack, and water electrolysis apparatus

Patent metadata

Field	Value
Publication number	US-2018274110-A1
Application number	US-201715698308-A
Country	US
Kind code	A1
Filing date	Sep 7, 2017
Priority date	Mar 23, 2017
Publication date	Sep 27, 2018
Grant date	—

Abstract

A laminated electrolyte membrane of an embodiment includes: a hydrocarbon-based electrolyte membrane; and a composite electrolyte membrane laminated with the hydrocarbon-based electrolyte, the composite electrolyte membrane containing a perfluorosulfonic acid-based electrolyte and a superstrong acid metal oxide having an acid function (H0) of −12 or less.

First claim

What is claimed is:

1 . A laminated electrolyte membrane, comprising:
a hydrocarbon-based electrolyte membrane; and a composite electrolyte membrane laminated with the hydrocarbon-based electrolyte, the composite electrolyte membrane containing a perfluorosulfonic acid-based electrolyte and a superstrong acid metal oxide having an acid function (H0) of −12 or less.

2 . The membrane according to claim 1 , wherein the superstrong acid metal oxide having the acid function (H0) of −12 or less in the composite electrolyte membrane is 20 mass % or more and 80 mass % or less.

3 . The membrane according to claim 1 , wherein, in the superstrong acid metal oxide, an oxide of an element Y containing at least one selected from the group consisting of: B, S, W, Mo, and V is supported on an oxide of an element X containing at least one selected from the group consisting of: Ti, Zr, Si, Sn, and Al.

4 . The membrane according to claim 3 , wherein the oxide of the element Y in the superstrong acid metal oxide is 2 mass % or more and 20 mass % or less.

5 . The membrane according to claim 3 , wherein the oxide of the element X is one or more oxides selected from the group consisting of: TiO 2 , SiO 2 , ZrO 2 , SnO 2 , SiAl x O y (0<x≤2, 2<y≤5), SiO—Al 2 O 3 , and TiW α O β (0<α≤1, 2<β≤5), and the oxide of the element Y is one or more oxides selected from the group consisting of: SO 4 , BO 3 , WO 3 , VO V (1≤γ≤2.5 or less), and MoO 3 .

6 . The membrane according to claim 1 , wherein the composite electrolyte membrane contains a radical scavenger or a hydrogen peroxide decomposer of 10 mass % or less.

7 . The membrane according to claim 1 , wherein the composite electrolyte membrane has a thickness of 10 μm or more and 200 μm or less.

8 . The membrane according to claim 1 , wherein the composite electrolyte membrane has a thickness of 11 μm or more and 23 μm or less.

9 . The membrane according to claim 3 , wherein the superstrong acid metal oxide is oxide particles, and the average primary particle diameter of the superstrong acid metal oxide is 1 nm or more and 1,000 nm or less.

10 . The membrane according to claim 3 , wherein the superstrong acid metal oxide is oxide particles, and the average primary particle diameter of the superstrong acid metal oxide is 4 nm or more and 200 nm or less.

11 . The membrane according to claim 1 , wherein the thickness of the laminated electrolyte membrane is 20 μm or more and 400 μm or less, and the thickness of the hydrocarbon-based electrolyte membrane is 10 μm or more and 150 μm or less.

12 . The membrane according to claim 1 , wherein the composite electrolyte membrane has a thickness of 10 μm or more and 200 μm or less.

13 . A membrane electrode assembly comprising:
a first electrode; a second electrode; and the laminated electrolyte membrane according to claim 1 between the first electrode and the second electrode.

14 . A water electrolysis cell using the membrane electrode assembly according to claim 13 .

15 . A stack using the membrane electrode assembly according to claim 13 .

16 . A stack using the water electrolysis cell according to claim 14 .

17 . A water electrolysis apparatus using the membrane electrode assembly according to claim 13 .

18 . A water electrolysis apparatus using the water electrolysis cell according to claim 14 .

19 . A water electrolysis apparatus using the stack according to claim 15 .

20 . A water electrolysis apparatus using the stack according to claim 16 .

Assignees

• Toshiba Kk

Inventors

• Nakano Yoshihiko
• Mei Wu
• Yoshinaga Norihiro
• Iida Atsuko

Classifications

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• H01M8/1032

  having sulfur, e.g. sulfonated-polyethersulfones [S-PES] · CPC title

• H01M8/1034

  having phosphorus, e.g. sulfonated polyphosphazenes [S-PPh] · CPC title

• B32B37/18

  involving the assembly of discrete sheets or panels only · CPC title

• C25B1/10 Primary

  Chemistry & Metallurgy · mapped topic