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Solid oxide electrolysis cell cathode material as well as preparation method and application thereof

A solid oxide and cathode material technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of small powder particle size, low synthesis temperature, affecting the electrochemical performance of cathode materials in solid oxide electrolytic cells, etc., to achieve Improving the electrochemical performance and eliminating the effect of impurity

Active Publication Date: 2015-01-28
TSINGHUA UNIV
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  • Summary
  • 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 electrolysis cell cathode material as well as preparation method and application thereof
  • Solid oxide electrolysis cell cathode material as well as preparation method and application thereof
  • Solid oxide electrolysis cell cathode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Take 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, press Sr 2 Fe 0.9 Mg 0.1 MoO 6-δ Weigh the required raw materials in a stoichiometric ratio, dissolve citric acid in an appropriate amount of deionized water, and add 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 iron 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 2:1. Then add ammonia water to adjust pH=3. Then the solution was heated and evaporated in a water bath at 90°C for several hours to form a gel. Next, put the gel in a 180°C thermostat to continue heating until it burns. After cooling, take out the fluffy combustion products and grind to obtain combustion powder. Place the combustion powder i...

Embodiment 2

[0055] Take 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, press Sr 2 FeMoO 6-δ Weigh the required raw materials in a stoichiometric ratio, dissolve citric acid in an appropriate amount of deionized water, add accurately weighed Sr(NO 3 ) 2 , Fe(NO 3 ) 3 ·9H 2 O, in order to avoid the formation of iron 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 2:1. Then add ammonia water to adjust pH=2. Then the solution was heated and evaporated in a water bath at 90°C for several hours to form a gel. Next, put the gel in a 180°C thermostat to continue heating until it burns. After cooling, take out the fluffy combustion products and grind to obtain combustion powder. Place the combustion powder in an air atmosphere at 600°C for 4 hours to pre-fire to re...

Embodiment 3

[0059] Take 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, press Sr 2 MgMoO 6-δ Weigh the required raw materials in a stoichiometric ratio, dissolve citric acid in an appropriate amount of deionized water, add accurately weighed Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, in order to avoid the formation of iron 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 2:1. Then add ammonia water to adjust pH=3. Then the solution was heated and evaporated in a 60°C water bath for several hours to form a gel. Next, put the gel in a 160°C thermostat to continue heating until it burns. After cooling, take out the fluffy combustion products and grind to obtain combustion powder. Place the combustion powder in an air atmosphere at 800°C for 2 hours to pre-fire to remov...

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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 solid oxide electrolytic cells, and a preparation method and application thereof. Background technique [0002] The acid rain, greenhouse effect, ozone layer hole and other global problems caused by fossil fuels have been around for a long time. Fossil fuels are increasingly unable to meet people’s higher-level energy needs, and new energy sources such as wind, nuclear, solar and hydrogen energy Energy is rising rapidly. Among them, hydrogen, as a clean and efficient renewable energy carrier, has attracted the attention of all countries in the world. Among them, high temperature steam eleetrolysis (HTSE) hydrogen production not only has no pollutants and greenhouse gas emissions during the reaction process, but the hydrogen production efficiency is as high as 45-59%. The core of HTSE is the solid oxide electrolysis cell (SOEC). How to design and pr...

Claims

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Application Information

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Patent Type & Authority Applications(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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