Solid oxide electrolytic cell cathode material and its preparation method and application

A solid oxide and cathode material technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of low synthesis temperature, small powder particle size, and the cathode material of solid oxide electrolytic cell needs to be deepened, so as to eliminate impurities Phase, the effect of improving electrochemical performance

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

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Problems solved by technology

At present, perovskite structure ceramics are the fastest-growing cathode materials for SOEC. For example, Chinese patent application No. 201010034518.9 discloses "Preparation method of perovskite powder material for cathode of solid oxide electrolytic cell". The method adopts the citric acid sol-gel combustion method, which has the characteristics of low synthesis temperature and small powder particle size, but the powder synthesized by this method contains SrMoO 3 Miscellaneous
SrO 3 Will seriously affect the electrochemical performance as a cathode material for solid oxide electrolytic cells
[0004] Therefore, the research on cathode materials for solid oxide electrolytic cells still needs to be further studied.

Method used

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  • Solid oxide electrolytic cell cathode material and its preparation method and application
  • Solid oxide electrolytic cell cathode material and its preparation method and application
  • Solid oxide electrolytic cell cathode material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0051] 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 burns. After cooling, take out the fluffy ...

Embodiment 2

[0055] 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 and grind it to obtain combustion powder. ...

Embodiment 3

[0059] 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 and grind it to obtain combustion powder. ...

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Abstract

The invention provides a solid oxide electrolysis cell cathode material as well as a preparation method and an application thereof. The method comprises the following steps: (1) providing gel; (2) heating the gel to be combusted, thereby obtaining a combustion product; (3) grinding the combustion product, thereby obtaining combustion powder; (4) pre-sintering the combustion powder, thereby obtaining pre-sintered powder; and (5) calcining the pre-sintered powder, thereby obtaining the solid oxide electrolysis cell cathode material. According to the method, the solid oxide electrolysis cell cathode material with the chemical composition of Sr2Fe(1-x)MxO6-delta can be rapidly and effectively prepared, and due to the two-section calcining method, the Sr2MoO3 mixed phase can be effectively eliminated, a single perovskite phase product is obtained, and the obtained product is small in particle size and high in electrical conductivity. In addition, the thermal expansion coefficient of the obtained solid oxide electrolysis cell cathode material is close to LSGM and is well matched with thermal expansion of an electrolyte material with excellent performance.

Description

technical field [0001] The invention relates to the field of solid oxide electrolytic cells, in particular to a cathode material for a solid oxide electrolytic cell and a preparation method and application thereof. Background technique [0002] Global problems such as acid rain, greenhouse effect, and ozone hole caused by fossil fuels have been around for a long time. The rapid rise of energy, among them, hydrogen, as a clean and efficient carrier of renewable energy, has attracted the attention of all countries in the world. Among them, high temperature steam electrolysis (HTSE) hydrogen production not only does not emit any pollutants and greenhouse gases during the reaction process, but also has a hydrogen production efficiency as high as 45-59%. The core of HTSE is solid oxide electrolysis cell (SOEC). How to design and prepare SOEC with superior performance is of great significance. [0003] The cathode material of SOEC plays an important role in providing a place for...

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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