Metal component for electrochemical stack and electrochemical stack

Patent metadata

Field	Value
Publication number	US-2023047305-A1
Application number	US-202217865935-A
Country	US
Kind code	A1
Filing date	Jul 15, 2022
Priority date	Aug 13, 2021
Publication date	Feb 16, 2023
Grant date	—

Abstract

A metal component for electrochemical stack in an embodiment includes: a metal base material having a first surface exposed to an atmosphere containing hydrogen and a second surface exposed to an atmosphere containing oxygen; and a hydrogen permeation inhibition and protection coating provided on the first surface of the metal base material. The metal component for electrochemical stack in the embodiment can suppress metallic corrosion also in the case where one side is in contact with air and the other side is in contact with an atmosphere containing hydrogen.

First claim

What is claimed is:

1 . A metal component for electrochemical stack comprising:
a metal base material having a first surface exposed to an atmosphere containing hydrogen and a second surface exposed to an atmosphere containing oxygen; and a hydrogen permeation inhibition and protection coating provided on the first surface of the metal base material.

2 . The metal component according to claim 1 , wherein
the hydrogen permeation inhibition and protection coating comprises at least one selected from the group consisting of aluminum, aluminum oxide, aluminum-chromium composite oxide, erbium oxide, silicon-chromium composite oxide, zirconium oxide, magnesium phosphate, aluminum phosphate, titanium nitride, titanium carbide, and silicon carbide.

3 . The metal component according to claim 1 , wherein:
the metal base material comprises chromium; and the hydrogen permeation inhibition and protection coating comprises at least one selected from the group consisting of aluminum-chromium composite oxide and silicon-chromium composite oxide, and at least part of chromium in the at least one selected from the group consisting of the aluminum-chromium composite oxide and the silicon-chromium composite oxide is formed by diffusion of chromium in the metal base material.

4 . The metal component according to claim 1 , wherein
the metal component is configured to use as a conduction member, and the hydrogen permeation inhibition and protection coating has a thickness of 2 μm or more and 30 μm or less.

5 . An electrochemical stack comprising:
a first electrochemical cell comprising a first electrode in contact with an atmosphere containing hydrogen, a second electrode in contact with an atmosphere containing oxygen, and an electrolyte layer interposed between the first electrode and the second electrode; a second electrochemical cell comprising a first electrode in contact with an atmosphere containing hydrogen, a second electrode in contact with an atmosphere containing oxygen, and an electrolyte layer interposed between the first electrode and the second electrode; and a separator arranged between the first electrode of the first electrochemical cell and the second electrode of the second electrochemical cell to electrically connect the first electrode of the first electrochemical cell and the second electrode of the second electrochemical cell, wherein the separator comprises a metal component comprising: a metal base material having a first surface arranged on the first electrode side of the first electrochemical cell and exposed to an atmosphere containing hydrogen and a second surface arranged on the second electrode side of the second electrochemical cell and exposed to an atmosphere containing oxygen; and a hydrogen permeation inhibition and protection coating provided on the first surface of the metal base material.

6 . The electrochemical stack according to claim 5 , wherein
the hydrogen permeation inhibition and protection coating comprises at least one selected from the group consisting of aluminum, aluminum oxide, aluminum-chromium composite oxide, erbium oxide, silicon-chromium composite oxide, zirconium oxide, magnesium phosphate, aluminum phosphate, titanium nitride, titanium carbide, and silicon carbide.

7 . The electrochemical stack according to claim 5 , wherein:
the metal base material comprises chromium; and the hydrogen permeation inhibition and protection coating comprises at least one selected from the group consisting of aluminum-chromium composite oxide and silicon-chromium composite oxide, and at least part of chromium in the at least one selected from the group consisting of the aluminum-chromium composite oxide and the silicon-chromium composite oxide is formed by diffusion of chromium in the metal base material.

8 . The electrochemical stack according to claim 5 , wherein
the hydrogen permeation inhibition and protection coating has a thickness of 2 μm or more and 30 μm or less.

9 . The electrochemical stack according to claim 5 , wherein
the electrolyte layer of the first electrochemical cell and the electrolyte layer of the second electrochemical cell comprise a solid oxide electrolyte.

10 . The electrochemical stack according to claim 5 , wherein
the first electrode of the first electrochemical cell and the first electrode of the second electrochemical cell are electrodes each for generating a hydrogen ion from supplied hydrogen, and the second electrode of the first electrochemical cell and the second electrode of the second electrochemical cell are electrodes each for generating water from supplied oxygen and the hydrogen ion sent from the first electrode.

11 . The electrochemical stack according to claim 5 , wherein
the first electrode of the first electrochemical cell and the first electrode of the second electrochemical cell are electrodes each for generating hydrogen and an oxide ion from supplied water, and the second electrode of the first electrochemical cell and the second electrode of the second electrochemical cell are electrodes each for generating oxygen from the oxide ion sent from the first electrode.

12 . An electrochemical stack comprising:
a first electrochemical cell comprising a first electrode in contact with an atmosphere containing hydrogen, a second electrode in contact with an atmosphere containing oxygen, and an electrolyte layer interposed between the first electrode and the second electrode; a second electrochemical cell comprising a first electrode in contact with an atmosphere containing hydrogen, a second electrode in contact with an atmosphere containing oxygen, and an electrolyte layer interposed between the first electrode and the second electrode; a separator arranged between the first electrode of the first electrochemical cell and the second electrode of the second electrochemical cell to electrically connect the first electrode of the first electrochemical cell and the second electrode of the second electrochemical cell; and a pipe having at least one of a supply pipe configured to supply gas containing hydrogen to the first electrode, and an exhaust pipe configured to exhaust gas containing hydrogen from the first electrode, wherein the pipe comprises a metal pipe comprising: a metal tube having an inner surface in contact with the supply gas or the exhaust gas, and an outer surface in contact with an atmosphere containing oxygen; and a hydrogen permeation inhibition and protection coating provided at least on the inner surface of the metal tube.

13 . The electrochemical stack according to claim 12 , wherein
the hydrogen permeation inhibition and protection coating comprises at least one selected from the group consisting of aluminum, aluminum oxide, aluminum-chromium composite oxide, erbium oxide, silicon-chromium composite oxide, zirconium oxide, magnesium phosphate, aluminum phosphate, titanium nitride, titanium carbide, and silicon carbide.

14 . The electrochemical stack according to claim 12 , wherein:
the metal tube comprises chromium; and the hydrogen permeation inhibition and protection coating comprises at least one selected from the group consisting of aluminum-chromium composite oxide and silicon-chromium composite oxide, and at least part of chromium in the at least one selected from the group consisting of the aluminum-chromium composite oxide and the silicon-chromium composite oxide is formed by diffusion of chromium in the metal tube.

15 . The electrochemical stack according to claim 12 , wherein
the electrolyte layer of the first electrochemical cell and the electrolyte layer of the sec

Assignees

• Toshiba Energy Systems & Solutions Corp

Inventors

• Inuzuka Riko
• Kameda Tsuneji
• Asayama Masahiro
• Osada Norikazu
• Kobayashi Shohei

Classifications

• Y02E60/50

  Fuel cells · CPC title

• H01M8/2432 Primary

  Grouping of unit cells of planar configuration · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M8/04201

  Reactant storage and supply, e.g. means for feeding, pipes · CPC title

• H01M8/0228 Primary

  in the form of layered or coated products · CPC title