Cathode including a tandem electrocatalyst and solid oxide fuel cell including the same

Patent metadata

Field	Value
Publication number	US-2021057770-A1
Application number	US-201916549848-A
Country	US
Kind code	A1
Filing date	Aug 23, 2019
Priority date	Aug 23, 2019
Publication date	Feb 25, 2021
Grant date	—

Abstract

A cathode having a tandem electrocatalyst structure is provided. The cathode includes a plurality of wires spaced apart from each other, a layer formed on a surface of each of the plurality of wires, and a plurality of nanoparticles disposed on the layer. Each of the plurality of wires includes a first perovskite material or a metal. The layer includes a second perovskite material. Each of the nanoparticles includes a metal oxide.

First claim

What is claimed is:

1 . A cathode comprising:
a plurality of wires spaced apart from each other, each of the plurality of wires comprising a material selected from the group consisting of: a first perovskite material and a metal; a layer formed on a surface of each of the plurality of wires, the layer comprising a second perovskite material; and a plurality of nanoparticles disposed on the layer, each of the plurality of nanoparticles comprising a metal oxide.

2 . The cathode according to claim 1 , wherein
each of the plurality of wires is formed of at least one selected from the group consisting of: lanthanum strontium cobalt ferrite and stainless steel.

3 . The cathode according to claim 1 , wherein
the second perovskite material is at least one selected from the group consisting of: praseodymium barium strontium cobalt ferrite and lanthanum strontium cobaltite.

4 . The cathode according to claim 1 , wherein
the metal oxide is at least one selected from the group consisting of: praseodymium oxide and neodymium oxide.

5 . The cathode according to claim 1 , wherein
the metal oxide is at least one selected from the group consisting of: chromium oxide and iron oxide.

6 . The cathode according to claim 1 , wherein
each of the plurality of wires has a length greater than or equal to 200 nm and less than or equal to 50 μm.

7 . The cathode according to claim 1 , wherein
a distance between each of the plurality of wires is greater than or equal to 100 nm and less than or equal to 10 μm.

8 . The cathode according to claim 3 , wherein
the distance between each of the plurality of wires is constant.

9 . The cathode according to claim 1 , wherein
each of the plurality of wires has a diameter greater than or equal to 100 nm and less than or equal to 10 μm.

10 . The cathode according to claim 1 , wherein
a thickness of the layer is greater than or equal to 50 nm and less than or equal to 200 nm.

11 . The cathode according to claim 1 , wherein
each of the plurality of nanoparticles has a size greater than or equal to 5 nm and less than or equal to 20 nm.

12 . The cathode according to claim 1 , wherein
a thickness of the cathode ranges from 200 μm to 400 μm.

13 . The cathode according to claim 1 , wherein
a top surface of each of the plurality of wires is free of the layer and the nanoparticles.

14 . The cathode according to claim 13 , wherein
the top surface of each of the plurality of wires is coated with an epoxy.

15 . A solid oxide fuel cell comprising:
a solid electrolyte; a plurality of wires spaced apart from each other and formed on the solid electrolyte layer, each of the plurality of wires comprising a material selected from the group consisting of: a first perovskite material and a metal; a layer formed on a surface of each of the plurality of wires, the layer comprising a second perovskite material; and a plurality of nanoparticles disposed on the layer, each of the plurality of nanoparticles comprising a metal oxide.

16 . The solid oxide fuel cell according to claim 15 , wherein
each of the plurality of wires is formed of at least one selected from the group consisting of: lanthanum strontium cobalt ferrite and stainless steel.

17 . The solid oxide fuel cell according to claim 15 , wherein
the second perovskite material is at least one selected from the group consisting of: praseodymium barium strontium cobalt ferrite and lanthanum strontium cobaltite.

18 . The solid oxide fuel cell according to claim 15 , wherein
the metal oxide is at least one selected from the group consisting of: praseodymium oxide and neodymium oxide.

19 . The solid oxide fuel cell according to claim 15 , further comprising
an anode comprising stainless steel.

20 . The solid oxide fuel cell according to claim 19 , further comprising
a bonding layer between the anode and the solid electrolyte, the bonding layer comprising scandium cerium-stabilized zirconia.

21 . The solid oxide fuel cell according to claim 19 , wherein
the anode comprises stainless steel particles and an anode catalyst coating on each of the stainless steel particles.

22 . The solid oxide fuel cell according to claim 15 , wherein
the solid oxide fuel cell does not include a current collector.

23 . The solid oxide fuel cell according to claim 15 , wherein
the anode has a thickness of 200 μm.

24 . The solid oxide fuel cell according to claim 15 , wherein
the solid electrolyte comprises scandium cerium-stabilized zirconia.

25 . A cathode comprising:
a plurality of wires spaced apart from each other, each of the plurality of wires formed of a metal; and a layer formed on a surface of each of the plurality of wires, the layer comprising a metal oxide.

26 . The cathode according to claim 25 , wherein
each of the plurality of wires is formed of stainless steel.

27 . The cathode according to claim 25 , wherein
the metal oxide comprises at least one transition metal and at least one rare-earth metal.

28 . The cathode according to claim 27 , wherein
the metal oxide is neodymium chromium oxide.

29 . A method of producing a solid oxide fuel cell, the method comprising:
providing a cathode comprising a plurality of metal wires spaced apart from each other on a first surface of a solid electrolyte, the second surface of the solid electrolyte opposite the first surface being in contact with an anode; forming a layer comprising a metal on a surface of each of the plurality of metal wires; heating the layer in air to a first temperature to form a first metal oxide in the layer; coating the layer with a plurality of nanoparticles; and heating the nanoparticles in air to a second temperature to form a second metal oxide in the layer.

30 . The method according to claim 29 , wherein
each of the plurality of metal wires are formed of stainless steel.

31 . The method according to claim 29 , wherein
the anode comprises a metal support and a bonding layer formed on the metal support, the bonding layer comprising a solid electrolyte material.

32 . The method according to claim 29 , wherein
the second metal oxide comprises neodymium and chromium.

Assignees

• Nissan North America Inc

Inventors

• Gumeci Cenk
• Abdul Jabbar Mohammed Hussain

Classifications

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/50

  Fuel cells · CPC title

• C04B2235/5264

  characterised by the diameter of the fibers · CPC title

• C04B35/62894

  with more than one coating layer · CPC title