# US 10,480,083 B2 · Steam electrolysis cell > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,083 B2 - Document ID: US10480083B2 - Status: Granted - Kind: B2 - Application number: 15/326,741 - Filed: 2015-05-20 - Published: 2017-07-27 - Granted: 2019-11-19 - Earliest claimed: 2014-07-28 - Assignees: Nippon Shokubai Co., Ltd. - Applicants: Nippon Shokubai Co., Ltd. - Inventors: Kuninori Miyazaki; Masatoshi Ikeda - Web page: https://patentgrep.com/patent/US10480083B2 ## CPC - C25B 1/04: by electrolysis of water - C01G 51/68: containing rare earths, e.g. (La0.3Sr0.7)CoO3 - C25B 1/042: by electrolysis of steam - C25B 9/73: of the filter-press type - C25B 11/02: characterised by shape or form - C25B 11/04: characterised by the material - C25B 11/051: Electrodes formed of electrocatalysts on a substrate or carrier - C25B 13/04: characterised by the material - C25B 13/05: based on inorganic materials - C01P 2002/34: perovskite-type (ABO3) - C01P 2006/12: Surface area - Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis - C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B) - C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20) - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## 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. ## Claims ### Claim 1 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 is formed by sintering at a temperature of 900° C. or lower and comprises a perovskite oxide having an ABO3 type structure, the perovskite oxide comprises Ba and Co, a part of the A site of the perovskite oxide is substituted by La, and a molar ratio of Co in the B site of the perovskite oxide is 90% or more. ### Claim 2 (depends on 1) The steam electrolysis cell according to claim 1, wherein the perovskite oxide comprises 30% or more by molar ratio of Ba in the A site. ### Claim 3 (depends on 1) The steam electrolysis cell according to claim 1, wherein in addition to the La, a part of the A site of the perovskite oxide is further substituted by one or more elements selected from the group consisting of Sr, Ce, Pr, Nd, Sm, Eu, Gd and Yb. ### Claim 4 (depends on 1) The steam electrolysis cell according to claim 1, wherein the anode layer is formed from a raw material powder having a BET specific surface area of 2.0 m2/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. ### Claim 5 (depends on 1) The steam electrolysis cell according to claim 1, wherein the proton conducting oxide electrolyte layer comprises a perovskite oxide having an ABO3 type structure containing an alkaline earth metal in the A site and a trivalent or tetravalent transition metal belonging to the group 4 elements through the group 14 elements in the periodic table in the B site. ### Claim 6 (depends on 1) The steam electrolysis cell according to claim 1, wherein the cathode layer comprises one or more metal elements and a perovskite oxide having an ABO3 type structure, wherein the metal element is selected from the group consisting of nickel, cobalt and iron, and the perovskite oxide contains an alkaline earth metal in the A site and a trivalent or tetravalent transition metal belonging to the group 4 elements through the group 14 elements in the periodic table in the B site. ### Claim 7 A method for producing hydrogen, comprising the steps of supplying a water vapor-containing gas to an anode layer of a steam electrolysis cell comprising the 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 having an ABO3 type structure, the perovskite oxide comprises Ba and Co, and a molar ratio of Co in the B site of the perovskite oxide is 90% or more, and applying voltage between the anode layer and the cathode layer, wherein a part of the A site of the perovskite oxide is substituted by La, and wherein the anode layer is formed by sintering at a temperature of 900° C. or lower. ### Claim 8 (depends on 7) The method according to claim 7, wherein the perovskite oxide comprises 30% or more by molar ratio of Ba in the A site. ### Claim 9 (depends on 7) The method according to claim 7, wherein in addition to the La, a part of the A site of the perovskite oxide is further substituted by one or more elements selected from the group consisting of Sr, Ce, Pr, Nd, Sm, Eu, Gd and Yb. ### Claim 10 (depends on 7) The method according to claim 7, wherein the anode layer is formed from a raw material powder having a BET specific surface area of 2.0 m2/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. ### Claim 11 (depends on 7) The method according to claim 7, wherein the proton conducting oxide electrolyte layer comprises a perovskite oxide having an ABO3 type structure containing an alkaline earth metal in the A site and a trivalent or tetravalent transition metal belonging to the group 4 elements through the group 14 elements in the periodic table in the B site. ### Claim 12 (depends on 7) The method according to claim 7, wherein the cathode layer comprises one or more metal elements and a perovskite oxide having an ABO3 type structure, the metal element is selected from the group consisting of nickel, cobalt and iron, and the perovskite oxide contains an alkaline earth metal in the A site and a trivalent or tetravalent transition metal belonging to the group 4 elements through the group 14 elements in the periodic table in the B site.