Method for producing an electrode catalyst from a perovskite metal oxide

Patent metadata

Field	Value
Publication number	US-2019190031-A1
Application number	US-201716316250-A
Country	US
Kind code	A1
Filing date	Jul 7, 2017
Priority date	Jul 8, 2016
Publication date	Jun 20, 2019
Grant date	—

Abstract

The invention relates to a method of producing electrode materials for solid oxide cells which comprises applying an electric potential to a metal oxide which has a perovskite crystal structure. The resultant electrode catalyst exhibits excellent electrochemical performance. The invention extends to the electrode catalyst itself, and to electrodes and solid oxide cells comprising the electrode catalyst.

First claim

1 - 9 . (canceled)

10 . A method of producing an electrode catalyst comprising applying an electric potential to a perovskite metal oxide.

11 . A method according to claim 10 , wherein the perovskite metal oxide has the formula:
(M 1 x1 M 2 x2 )(M 3 y M 4 z M 5 a M 6 b )O 3-γ
wherein
M 1 is a rare earth metal,
M 2 is an alkaline earth metal,
M 3 , M 4 , M 5 and M 6 are each independently Al or a transition metal, and M 3 is different from at least one of M 4 , M 5 and M 6 ,
0≤x1+x2≤1,
0<y≤1,
0<z≤1,
0≤a≤1,
0≤b≤1,
y+z+a+b=1, and
0≤γ≤0.1.

12 . A method according to claim 11 , wherein M 1 is selected from the group consisting of La, Ce and Pr; M 2 is selected from the group consisting of Ca, Sr and Ba; M 3 is selected from the group consisting of Ti, Cr, Fe, Al and Sc; M 4 , M 5 and M 6 are each independently chosen from the group consisting of Ti, Sc, V, Mn, Cr, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Ru, Rh, Pd, Cd, Ag, Pt, Au and Al; and M 3 is different from at least one of M 4 , M 5 and M 6 .

13 . A method according to claim 11 , wherein M 2 is Ca.

14 . A method according to claim 12 , wherein M 2 is Ca.

15 . A method according to claim 10 comprising applying an electrical potential of from 1.5 to 2.5 volts to the perovskite metal oxide.

16 . An electrode catalyst obtained or obtainable by the method of claim 10 .

17 . An electrode comprising the electrode catalyst of claim 16 .

18 . A solid oxide cell comprising an electrode according to claim 17 .

19 . A method of operating the solid oxide cell of claim 18 in fuel cell mode comprising combining H 2 and O 2 electrochemically to produce power.

20 . A method of regenerating an electrode catalyst according to claim 16 , which method comprises applying an electrical potential to the electrode catalyst.

21 . A method according to claim 20 , comprising applying an electrical potential to an electrode comprising said electrode catalyst, which electrode is in a solid oxide cell, under solid oxide cell operating conditions.

Assignees

• Univ Court Univ St Andrews

Inventors

• Irvine John T S
• Myung Jae-Ha
• Neagu Dragos
• Miller David

Classifications

• H01M8/1213

  characterised by the electrode/electrolyte combination or the supporting material · CPC title

• H01M8/04223

  during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells · CPC title

• H01M4/8621 Primary

  containing only metallic or ceramic material, e.g. made by sintering or sputtering · CPC title

• H01M8/186

  by electrolytic decomposition of the electrolytic solution or the formed water product · CPC title

• H01M4/8835

  Screen printing · CPC title