Steam electrolysis cell

Patent metadata

Field	Value
Publication number	US-2017211193-A1
Application number	US-201515326741-A
Country	US
Kind code	A1
Filing date	May 20, 2015
Priority date	Jul 28, 2014
Publication date	Jul 27, 2017
Grant date	—

Abstract

The objective of the present invention is to provide a steam electrolysis cell of which current efficiency is high and by which hydrogen can be efficiently produced, and a method for producing hydrogen using the steam electrolysis cell. The steam electrolysis cell according to the present invention is characterized in comprising an anode layer, a cathode layer, and a proton conducting oxide electrolyte layer between the anode layer and the cathode layer, wherein the anode layer comprises a perovskite oxide, and the perovskite oxide comprises Ba and Co.

First claim

1 . The A steam electrolysis cell,
comprising an anode layer, a cathode layer, and a proton conducting oxide electrolyte layer between the anode layer and the cathode layer, wherein the anode layer comprises a perovskite oxide, and the perovskite oxide comprises Ba and Co.

2 . The steam electrolysis cell according to claim 1 , wherein the perovskite oxide comprises 30% or more by molar ratio of Ba in A site and at least Co in B site.

3 . The steam electrolysis cell according to claim 1 , wherein a part of the A site of the perovskite oxide is substituted by one or more elements selected from Sr, La, Ce, Pr, Nd, Sm, Eu, Gd and Yb.

4 . The steam electrolysis cell according to claim 1 , wherein the anode layer is formed from a raw material powder having BET specific surface area of 2.0 m 2 /g or more in a case where the raw material powder is calcined in the same condition as a sintering condition to form the anode layer.

5 . The steam electrolysis cell according to claim 1 , wherein the anode layer is formed by sintering at a temperature of 900° C. or lower.

6 . The steam electrolysis cell according to claim 1 , wherein the proton conducting oxide electrolyte layer comprises a perovskite oxide containing an alkaline earth metal in A site and a trivalent or tetravalent transition metal belonging to the group 4 element through the group 14 element in the periodic table in B site.

7 . The steam electrolysis cell according to claim 1 , wherein the cathode layer comprises one or more metal elements and a perovskite oxide, the metal element is selected from nickel, cobalt and iron, and the perovskite oxide contains an alkaline earth metal in A site and a trivalent or tetravalent transition metal belonging to the group 4 element through the group 14 element in the periodic table in B site.

8 - 11 . (canceled)

12 . A method for producing hydrogen, comprising the steps of
supplying a water vapor-containing gas to the anode layer of a steam electrolysis cell comprising an anode layer, a cathode layer, and a proton conducting oxide electrolyte layer between the anode layer and the cathode layer, wherein the anode layer comprises a perovskite oxide, and the perovskite oxide comprises Ba and Co, and applying voltage between the anode layer and the cathode layer.

13 . The method according to claim 12 , wherein the perovskite oxide comprises 30% or more by molar ratio of Ba in A site and at least Co in B site.

14 . The steam electrolysis cell according to claim 12 , wherein a part of the A site of the perovskite oxide is substituted by one or more elements selected from Sr, La, Ce, Pr, Nd, Sm, Eu, Gd and Yb.

15 . The steam electrolysis cell according to claim 12 , wherein the anode layer is formed from a raw material powder having BET specific surface area of 2.0 m 2 /g or more in a case where the raw material powder is calcined in the same condition as a sintering condition to form the anode layer.

16 . The steam electrolysis cell according to claim 12 , wherein the anode layer is formed by sintering at a temperature of 900° C. or lower.

17 . The steam electrolysis cell according to claim 12 , wherein the proton conducting oxide electrolyte layer comprises a perovskite oxide containing an alkaline earth metal in A site and a trivalent or tetravalent transition metal belonging to the group 4 element through the group 14 element in the periodic table in B site.

18 . The steam electrolysis cell according to claim 12 , wherein the cathode layer comprises one or more metal elements and a perovskite oxide, the metal element is selected from nickel, cobalt and iron, and the perovskite oxide contains an alkaline earth metal in A site and a trivalent or tetravalent transition metal belonging to the group 4 element through the group 14 element in the periodic table in B site.

Assignees

• Nippon Catalytic Chem Ind

Inventors

• Miyazaki Kuninori
• Ikeda Masatoshi

Classifications

• C01P2002/34

  perovskite-type (ABO3) · CPC title

• C25B11/04

  characterised by the material · CPC title

• C01P2006/12

  Surface area · CPC title

• C25B11/02

  characterised by shape or form · CPC title

• C25B13/04

  characterised by the material · CPC title