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Electrolytic cell and electrolytic device

Foreign code F210010547
File No. J1014-32WO
Posted date 2021年8月2日
Country アメリカ合衆国
Application number 201917040853
Gazette No. 20210025063
Date of filing 平成31年3月28日(2019.3.28)
Gazette Date 令和3年1月28日(2021.1.28)
International application number JP2019013888
International publication number WO2019189701
Date of international filing 平成31年3月28日(2019.3.28)
Date of international publication 令和元年10月3日(2019.10.3)
Priority data
  • 特願2018-066164 (2018.3.29) JP
  • 2019JP13888 (2019.3.28) WO
Title Electrolytic cell and electrolytic device
Abstract An electrolytic cell capable of simply electrolyzing carbon dioxide into carbon monoxide and oxygen with low activation energy, and an electrolytic device. The carbon dioxide electrolytic cell includes a cathode, an anode, and a solid electrolyte having oxide ion conductivity. The cathode is the following (A) or (B); (A) a metal and a first mayenite-type compound are included therein or (B) a metal and a second mayenite-type compound are included therein, said second mayenite type compound including a mayenite type compound having electron conductivity.
Outline of related art and contending technology BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to an electrolytic cell and an electrolytic device.
Description of Related Art
As a target for reducing greenhouse gas becomes mandatory on a global scale (Paris Agreement), carbon dioxide sequestration and carbon dioxide decomposition are being actively studied, and among them, electrolysis is attracting attention as one of new options.
For example, a method of decomposing CO2 gas into solid carbon and O2 gas using molten salt as an electrolyte has been proposed (for example, Patent Document 1).
A method of electrolyzing carbon dioxide into carbon monoxide and oxygen by using a defect transfer type oxide ion conductor such as yttria stabilized zirconia (hearafter, referred to as “YSZ”.) formed by adding Y2O3 to ZrO2 as an electrolyte has been proposed (for example, Patent Document 2).
[Patent Document 1] Japanese Unexamined Patent Application Publication No. 2013-237901
[Patent Document 2] Japanese Unexamined Patent Application Publication No. 2013-173980
Scope of claims [claim1]
1. A electrolytic cell comprising:
a cathode,
an anode, and
a solid electrolyte having oxide ion conductivity;
wherein
the cathode is following (A) or (B):
(A) the cathode comprises a metal and a first mayenite-type compound, or
(B) the cathode comprises a metal and a second mayenite-type compound, wherein the second mayenite-type compound comprises a mayenite-type compound having electronic conductivity;
each of the first mayenite-type compound and the second mayenite-type compound is a mayenite-type compound having a representative composition represented by 12CaO.7Al2O3;
the first mayenite-type compound and the second mayenite-type compound are the same or different; and
the mayenite-type compound comprises Al and at least one element selected from the group consisting of Ca and Sr, and a molar ratio of a sum of CaO and SrO to Al2O3 in terms of oxides is 12.6:6.4 to 11.7:7.3.

[claim2]
2. The electrolytic cell according to claim 1,
wherein the mayenite-type compound comprises:
(i) at least one element selected from the group consisting of B, Si and Ge, and total amount thereof is 0 to 17 mol % in terms of oxides with respect to the mayenite-type compound;
(ii) at least one element selected from the group consisting of Li, Na, and K, and total amount thereof is 0 to 5 mol % in terms of oxides with respect to the mayenite-type compound;
(iii) at least one element selected from the group consisting of Mg and Ba, and total amount thereof is 0 to 10 mol % in terms of oxides with respect to the mayenite-type compound; and
(iv) at least one element selected from the group consisting of:
at least one rare earth element selected from the group consisting of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb,
at least one transition metal element selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Pd, Ir, and Pt, and
at least one typical metal element selected from the group consisting of Zn, Cd, In, and Sn,
nd total amount thereof is 0 to 8 mol % in terms of oxides with respect to the mayenite-type compound.

[claim3]
3. The electrolytic cell according to claim 1 or 2,
wherein the solid electrolyte is a third mayenite-type compound;
the third mayenite-type compound is the mayenite-type compound having the representative composition represented by 12 CaO.7Al2O3; and
the third mayenite-type compound is the same as or different from the first mayenite-type compound or the second mayenite-type compound.

[claim4]
4. The electrolytic cell according to claim 1,
wherein the anode is the first mayenite-type compound or the second mayenite-type compound.

[claim5]
5. The electrolytic cell according to claim 1,
wherein the electrolytic cell is for decomposing carbon dioxide.

[claim6]
6. An electrolytic device comprising the electrolytic cell according to claim 1.

[claim7]
7. A method for decomposing carbon dioxide using the electrolytic device according to claim 1.

[claim8]
8. A method of decomposing carbon dioxide, comprising:
decomposing carbon dioxide into carbon monoxide and oxygen by using the electrolytic cell according to claim 1.

[claim9]
9. A method of decomposing carbon dioxide, comprising:
decomposing carbon dioxide into carbon monoxide and oxygen with the electrolytic device according to claim 6.
  • Inventor, and Inventor/Applicant
  • HOSONO HIDEO
  • YOKOYAMA TOSHIHARU
  • TODA YOSHITAKE
  • ISHIYAMA SHINTARO
  • TAGUCHI MASAMI
  • TAKAHASHI HIROKI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
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