Perovskite structure, method for producing and application in electrodes and solid oxide cells

Patent metadata

Field	Value
Publication number	US-2023357045-A1
Application number	US-202118246469-A
Country	US
Kind code	A1
Filing date	Sep 22, 2021
Priority date	Sep 24, 2020
Publication date	Nov 9, 2023
Grant date	—

Abstract

Perovskite structures are disclosed comprising: a first element X which may be barium and/or a lanthanide, strontium, iron, cobalt, oxygen, magnesium and tungsten; the structure comprising a region of single perovskite and a region of double perovskite. Also disclosed are methods for forming such structures, electrodes comprising such structures and solid oxide cells using such structures.

First claim

1 . A perovskite structure comprising:
a first element X, strontium, iron, cobalt, oxygen, and tungsten; wherein the first element X is barium and/or a lanthanide; wherein the structure comprises a region of single perovskite and a region of double perovskite; and wherein the perovskite further comprises magnesium.

2 . The perovskite structure according to claim 1 , wherein the concentration of tungsten is in the range of 20-50 at. %.

3 . The perovskite structure according to claim 1 , wherein the concentration of magnesium is up to 20 at. %.

4 . The perovskite structure according to claim 1 , wherein the concentration of magnesium is in the range 1 at. % to 18 at. %.

5 . The perovskite structure according to claim 1 , wherein the concentration of magnesium is in the range 3 at. % to 14 at. %.

6 . The perovskite structure according to claim 1 , wherein the concentration of magnesium is in the range 5 at. % to 10 at. %.

7 . The perovskite structure according to claim 1 , wherein the lanthanide is lanthanum.

8 . The perovskite structure according to claim 1 , wherein element X is barium.

9 . The perovskite structure according to claim 1 , wherein the perovskite has a formula according to formula (1):
(Ba 1-x Sr x )(Co 1-y Fe y ) a W b Mg c O d   (I)
wherein x and y are each independently in the range 0.1 to 0.9; the sum of a, b and c is equal to 1; c is >0; and d is in the range of 2 to 3.

10 . The perovskite structure according to claim 9 , wherein c is in the range 0.05 to 0.2.

11 . An electrode comprising the perovskite structure according to claim 1 .

12 . The electrode according to claim 11 , wherein the electrode is an air electrode.

13 . A solid oxide cell comprising the perovskite structure according to claim 1 .

14 . The solid oxide cell according to claim 13 , wherein the solid oxide cell is a solid oxide fuel cell or a solid oxide electrolysis cell.

15 . A method of forming a perovskite structure according to claim 1 , comprising the steps of:
mixing starting materials, wherein the starting materials comprise: a first element X, strontium, iron, cobalt, oxygen, tungsten, and magnesium to form a mixture; heating the mixture to a first temperature for a first period of time to form a single perovskite; and heating the mixture to a second temperature for a second period of time to form a double perovskite; wherein the first element X is barium and/or a lanthanide.

16 . The method according to claim 15 , further comprising a comminuting step prior to the heating steps.

17 . The method according to claim 15 , wherein the first temperature is in the range 650° C.-750° C.

18 . The method according to claim 15 , wherein the second temperature is in the range 850° C.-1000° C.

19 . The method according to claim 15 , wherein the first period of time is in the range 4 to 8 hours.

20 . The method according to claim 15 , wherein the second period of time is in the range 6 to 10 hours.

21 - 23 . (canceled)

24 . The method according to claim 15 , wherein the method is repeated at least once.

Assignees

• Ceres Ip Co Ltd

Inventors

• Hu Dingyue
• Rosseinsky Matthew
• Claridge John

Classifications

• C01G41/006 Primary

  Compounds containing tungsten, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• 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

• C25B11/047

  Ceramics · CPC title

• C01P2002/52

  containing elements as dopants · CPC title

• C01P2006/40

  Electric properties · CPC title