Electrochemical apparatus and hydrogen generation method

Patent metadata

Field	Value
Publication number	US-2022056597-A1
Application number	US-202117517033-A
Country	US
Kind code	A1
Filing date	Nov 2, 2021
Priority date	May 27, 2019
Publication date	Feb 24, 2022
Grant date	—

Abstract

The electrochemical apparatus of the present disclosure includes a first stack that includes an oxide ion conductor as an electrolyte and decomposes water vapor to generate hydrogen and oxygen, a second stack that includes a proton conductor as an electrolyte and separates the hydrogen generated in the first stack from a gas mixture of the hydrogen and the water vapor that has not been decomposed in the first stack, and a heat insulation material that covers the first stack and the second stack.

First claim

What is claimed is:

1 . An electrochemical apparatus comprising:
a first stack that includes an oxide ion conductor as an electrolyte and decomposes water vapor to generate hydrogen and oxygen; a second stack that includes a proton conductor as an electrolyte and separates the hydrogen generated in the first stack from a gas mixture of the hydrogen and the water vapor that has not been decomposed in the first stack; and a heat insulation material that covers the first stack and the second stack.

2 . The electrochemical apparatus according to claim 1 , further comprising:
a first path that is connected to the first stack and introduces the water vapor to the first stack; a second path that connects between the first stack and the second stack and introduces the gas mixture from the first stack to the second stack; and a third path in which the hydrogen separated in the second stack flows.

3 . The electrochemical apparatus according to claim 1 , further comprising:
an evaporator that generates the water vapor to be supplied to the first stack from water in a liquid phase.

4 . The electrochemical apparatus according to claim 3 , wherein
the heat insulation material covers the first stack, the second stack, and the evaporator.

5 . The electrochemical apparatus according to claim 1 , further comprising:
a power source that supplies electric power to the first stack and the second stack.

6 . The electrochemical apparatus according to claim 1 , further comprising:
a first power source that supplies electric power to the first stack; and a second power source that supplies electric power to the second stack.

7 . The electrochemical apparatus according to claim 1 , wherein the proton conductor includes at least one selected from the group consisting of BaZr 1−x1 M1 x1 O 3−δ , BaCe 1−x2 M2 x2 O 3−δ , and BaZr 1−x3−y3 Ce x3 M3 y3 O 3−δ , where
M1, M2, and M3 each include at least one selected from the group consisting of Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Y, Sc, In, and Lu; x1 is a value of satisfying 0<x1<1; x2 is a value of satisfying 0<x2<1; x3 is a value of satisfying 0<x3<1; y3 is a value of satisfying 0<y3<1; and δ is a value of satisfying 0<δ<0.5.

8 . The electrochemical apparatus according to claim 7 , wherein the proton conductor is made of BaZr 1−x1 M1 x1 O 3−δ .

9 . A hydrogen generation method comprising:
generating hydrogen and oxygen by decomposing water vapor using a first stack that includes an oxide ion conductor as an electrolyte; and separating the hydrogen from a gas mixture of the hydrogen generated in the first stack and the water vapor that has not been decomposed in the first stack using a second stack that includes a proton conductor as an electrolyte,

10 . An electrochemical apparatus comprising:
a first stack that includes an oxide ion conductor as an electrolyte; a second stack that includes a proton conductor as an electrolyte; and a heat insulation material that covers the first stack and the second stack, wherein a power generation reaction is performed in the first stack using oxygen and hydrogen passed through the second stack.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Mikami Yuichi
• Kuroha Tomohiro
• Kakuwa Takashi
• Terayama Takeshi
• Onuma Shigenori
• Nunoo Kosuke
• Goto Takehito
• Kawada Kyohei

Classifications

• C25B15/083

  Separating products · CPC title

• C25B9/70

  Assemblies comprising two or more cells · CPC title

• C25B1/02

  Hydrogen or oxygen · CPC title

• C25B13/07

  based on ceramics · CPC title

• C25B1/042

  by electrolysis of steam · CPC title