Air electrode, water electrolysis anode, metal air cell, and water electrolysis device

Patent metadata

Field	Value
Publication number	US-2017362717-A1
Application number	US-201715689377-A
Country	US
Kind code	A1
Filing date	Aug 29, 2017
Priority date	Mar 13, 2015
Publication date	Dec 21, 2017
Grant date	—

Abstract

Provided is an air electrode or water electrolysis anode showing a higher catalytic activity than carbon black and not having a risk of oxidative degradation, in particular, an air electrode or water electrolysis anode for a metal-air battery or a water electrolysis apparatus. The air electrode or water electrolysis anode includes an electron-conductive material represented by LaNi 1−x−y Cu x Fe y O 3−δ (where x>0, y>0, x+y<1, and 0≦δ≦0.4).

First claim

What is claimed is:

1 . An air electrode or water electrolysis anode for a metal-air battery or water electrolysis apparatus, comprising an electron-conductive material represented by LaNi 1−x−y Cu x Fe y O 3−δ , where x>0, y>0, x+y<1, and 0≦δ≦0.4.

2 . The air electrode or water electrolysis anode according to claim 1 , wherein the electron-conductive material further functions as an air electrode catalyst or a water electrolysis anode catalyst.

3 . The air electrode or water electrolysis anode according to claim 1 , wherein the subscript x satisfies x≦0.5.

4 . The air electrode or water electrolysis anode according to claim 1 , wherein the subscript x satisfies 0.01≦x≦0.5.

5 . The air electrode or water electrolysis anode according to claim 1 , wherein the subscript y satisfies y≦0.3.

6 . The air electrode or water electrolysis anode according to claim 1 , wherein the subscript y satisfies 0.01≦y≦0.3.

7 . The air electrode or water electrolysis anode according to claim 1 , wherein the electron-conductive material includes a perovskite crystal phase.

8 . The air electrode or water electrolysis anode according to claim 1 , further comprising a hydroxide-ion conductive material.

9 . The air electrode or water electrolysis anode according to claim 8 , wherein the hydroxide-ion conductive material contains a layered double hydroxide having a fundamental composition represented by a formula: M 2+ 1−x M 3+ x (OH) 2 A n− x/n .mH 2 O, where M 2+ represents at least one divalent cation, M 3+ represents at least one trivalent cation, A n− represents an n-valent anion, n is an integer of 1 or more, x is 0.1 to 0.4, and m is 0 or more.

10 . The air electrode or water electrolysis anode according to claim 9 , wherein M 2+ includes Ni 2+ , M 3+ includes Fe 3+ , and A n− includes NO 3− and/or CO 3 2− .

11 . The air electrode or water electrolysis anode according to claim 8 , wherein the hydroxide-ion conductive material contains a polymer material having hydroxide-ion conductivity.

12 . The air electrode or water electrolysis anode according to claim 9 , comprising the hydroxide-ion conductive material in an amount of 5 to 95 vol % based on the total amount of the electron-conductive material and the hydroxide-ion conductive material.

13 . The water electrolysis anode according to claim 1 , wherein the water electrolysis apparatus includes a hydroxide-ion conductive solid electrolyte and/or a hydroxide-ion conductive electrolytic solution.

14 . The water electrolysis anode according to claim 1 , wherein the water electrolysis apparatus includes a hydroxide-ion conductive solid electrolyte.

15 . A separator-equipped air electrode comprising:
the air electrode according to claim 1 ; and a hydroxide-ion conductive separator disposed on one side of the air electrode.

16 . A solid electrolyte-equipped water electrolysis anode comprising:
the water electrolysis anode according to claim 1 ; and a hydroxide-ion conductive solid electrolyte disposed on one side of the water electrolysis anode.

17 . A metal-air battery comprising:
the air electrode according to claim 1 ; a metal negative electrode; and an electrolytic solution.

18 . A metal-air battery comprising:
the separator-equipped air electrode according to claim 15 ; a metal negative electrode; and an electrolytic solution.

19 . A water electrolysis apparatus comprising:
the water electrolysis anode according to claim 1 ; a cathode; and a hydroxide-ion conductive solid electrolyte and/or a hydroxide-ion conductive electrolytic solution.

Assignees

• Ngk Insulators Ltd

Inventors

• Hattori Tatsuya
• Yamamura Yoshihiko
• Kitoh Kenshin
• Yamada Naohito
• Saito Naomi

Classifications

• H01M4/9033

  Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites · CPC title

• H01M4/8652

  as mixture · CPC title

• H01M12/08

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• H01M4/9008

  Organic or organo-metallic compounds · CPC title

• H01M4/9016

  Oxides, hydroxides or oxygenated metallic salts · CPC title