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Cathode materials for solid oxide electrolysis cells and their applications

A technology of solid oxide and cathode materials, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems that affect the service life of the electrolytic cell and hydrogen production efficiency, the solid oxide electrolytic cell needs to be deepened, Ni agglomeration and volatilization, etc.

Active Publication Date: 2017-08-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it was found that the Ni / YSZ cathode material used in the related art would have problems such as low water vapor transmission rate, agglomeration and volatilization of Ni in the high-temperature and high-humidity environment of high-temperature electrolysis of water for hydrogen production, which seriously affected the use of electrolytic cells. Lifetime and Hydrogen Production Efficiency
[0004] Therefore, the research on solid oxide electrolytic cells still needs to be deepened.

Method used

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  • Cathode materials for solid oxide electrolysis cells and their applications
  • Cathode materials for solid oxide electrolysis cells and their applications
  • Cathode materials for solid oxide electrolysis cells and their applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 1. Preparation of cathode slurry

[0077] With Sr(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O, Mg(NO 3 ) 2 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O is the raw material, according to Sr 2 Fe 0.9 Mg 0.1 MoO 6-δ The stoichiometric ratio weighs the required raw materials, dissolves citric acid in an appropriate amount of deionized water, and adds accurately weighed Sr(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O, Mg(NO 3 ) 2 ·6H 2 O, in order to avoid the formation of ferric molybdate precipitation under weak acid conditions, ammonium molybdate is dissolved in deionized water to form a clear solution and then added to the above mixed solution, wherein the molar ratio of citric acid to the total number of metal ions is guaranteed to be 2:1. Aqueous ammonia was then added to adjust the pH to about 3. Then the solution was placed in a 90°C water bath and heated to evaporate for several hours until a gel was formed. Next, put the gel into a 180°C incubator and continue heating until it ...

Embodiment 2

[0088] 1. Preparation of cathode slurry

[0089] With Sr(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O is the raw material, according to Sr 2 FeMoO 6-δ The stoichiometric ratio weighs the required raw materials, dissolves citric acid in an appropriate amount of deionized water, and adds accurately weighed Sr(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O, in order to avoid the formation of ferric molybdate precipitation under weak acid conditions, ammonium molybdate is dissolved in deionized water to form a clear solution and then added to the above mixed solution, wherein the molar ratio of citric acid to the total number of metal ions is guaranteed to be 2:1. Aqueous ammonia was then added to adjust the pH to about 2. Then the solution was placed in a 90°C water bath and heated to evaporate for several hours until a gel was formed. Next, put the gel into a 180°C incubator and continue heating until it burns. After cooling, take out the fluffy combustion product ...

Embodiment 3

[0099] 1. Preparation of cathode slurry

[0100] With Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O is the raw material, according to Sr 2 MgO 6-δ The stoichiometric ratio weighs the required raw materials, dissolves citric acid in an appropriate amount of deionized water, and adds accurately weighed Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, in order to avoid the formation of ferric molybdate precipitation under weak acid conditions, ammonium molybdate is dissolved in deionized water to form a clear solution and then added to the above mixed solution, wherein the molar ratio of citric acid to the total number of metal ions is guaranteed to be 2:1. Aqueous ammonia was then added to adjust the pH to about 3. Then the solution was placed in a 60°C water bath and heated to evaporate for several hours until a gel was formed. Next, put the gel into a 160°C incubator and continue heating until it burns. After cooling, take out the fluffy combustion product ...

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Abstract

The invention provides a cathode material used for a solid oxide electrolytic cell and application of the cathode material. The chemical constitution of the cathode material is Sr2Fe1-xMxMoO6-Delta, wherein x is larger than or equal to 0 and smaller than or equal to 1; M is one or more selected from Mg, Zn, Ni, Co, Cu and Mn; an SrMoO3 phase is not contained in the cathode material. The cathode material does not comprise the SrMoO3 phase, adopts a single perovskite phase structure, can effectively solve the problem that the electrochemical performance of the Sr2Fe1-xMxMoO6-Delta is undesirable due to existence of the SrMoO3 phase, has favorable electrochemical performance, and can effectively improve hydrogen manufacturing efficiency of the solid oxide electrolytic cell.

Description

technical field [0001] The invention relates to the field of solid oxide electrolytic cells, in particular, to cathode materials for solid oxide electrolytic cells and applications thereof, more specifically, to cathode materials for solid oxide electrolytic cells, and cathodes for solid oxide electrolytic cells - Electrolyte-anode assembly and method for its preparation and solid oxide electrolytic cell. Background technique [0002] Due to the increasingly prominent energy and environmental issues, people have paid more and more attention to the scientific issue of hydrogen production by high-temperature electrolysis of water. In the field of basic research related to solid oxide electrolytic cells, such as electrode materials, electrolyte materials, connector materials and sealing materials, and the overall performance of single cells, there are continuous reports of new achievements. [0003] However, it was found that the Ni / YSZ cathode material used in the related art...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/04
CPCC25B1/04C25B11/04Y02E60/36
Inventor 马景陶盖文超赵兴宇郝少昌邓长生
Owner TSINGHUA UNIV
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