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Electrolytic cell and electrolytic device

外国特許コード F210010546
整理番号 J1014-32WO
掲載日 2021年8月2日
出願国 欧州特許庁(EPO)
出願番号 19776652
公報番号 3778992
出願日 平成31年3月28日(2019.3.28)
公報発行日 令和3年2月17日(2021.2.17)
国際出願番号 JP2019013888
国際公開番号 WO2019189701
国際出願日 平成31年3月28日(2019.3.28)
国際公開日 令和元年10月3日(2019.10.3)
優先権データ
  • 特願2018-066164 (2018.3.29) JP
  • 2019JP13888 (2019.3.28) WO
発明の名称 (英語) Electrolytic cell and electrolytic device
発明の概要(英語) Provided are: an electrolytic cell which has a low activation energy and can easily electrolyze carbon dioxide into carbon monoxide and oxygen; and an electrolytic device. This carbon dioxide electrolytic cell comprises a cathode, an anode, and a solid electrolyte having oxide ion conductivity. The electrolytic cell is characterized in that the cathode satisfies either (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 electrical conductivity.
従来技術、競合技術の概要(英語) 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
特許請求の範囲(英語) [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,
and 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 any one of claims 1 to 3,
wherein the anode is the first mayenite-type compound or the second mayenite-type compound.

[claim5]
5. The electrolytic cell according to any one of claims 1 to 4,
wherein the electrolytic cell is for decomposing carbon dioxide.

[claim6]
6. An electrolytic device comprising the electrolytic cell according to any one of claims 1 to 5.

[claim7]
7. A method for decomposing carbon dioxide using the electrolytic device according to any one of claims 1 to 6.
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • HOSONO HIDEO
  • YOKOYAMA TOSHIHARU
  • TODA YOSHITAKE
  • ISHIYAMA SHINTARO
  • TAGUCHI MASAMI
  • TAKAHASHI HIROKI
国際特許分類(IPC)
指定国 Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Extension States: BA ME
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