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Preparation method of La1.8Sr0.2NiO4+delta-Ce0.8Sm0.2O1.9 composite cathode powder

A -ce0.8sm0.2o1.9, cathode technology, which is applied in the field of composite system cathode powder materials and its preparation, can solve the problems of complex process control, difficult to control the uniformity of electrolyte component distribution, and impregnation amount limitation, etc. The process is simple, the cathode electrocatalytic performance is promoted, and the synthesis temperature is low.

Inactive Publication Date: 2020-07-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mechanical mixing method is simple and easy to control the composition of the composite cathode in a wide range of composition, it is also difficult to control the distribution uniformity of the electrolyte components in the mixed conductor porous cathode.
The main advantage of the precursor impregnation method is that it can realize the uniform distribution of the electrolyte components in the porous structure of the cathode. The main disadvantage is that the process control is relatively complicated.
In addition, since the precursor impregnation method is to form electrolyte components in the porous structure of the sintered mixed conductor cathode, the impregnation amount of the electrolyte precursor solution in the porous structure is limited.

Method used

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  • Preparation method of La1.8Sr0.2NiO4+delta-Ce0.8Sm0.2O1.9 composite cathode powder
  • Preparation method of La1.8Sr0.2NiO4+delta-Ce0.8Sm0.2O1.9 composite cathode powder
  • Preparation method of La1.8Sr0.2NiO4+delta-Ce0.8Sm0.2O1.9 composite cathode powder

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0025] According to La 1.8 Sr 0.2 NiO 4+δ The stoichiometric ratio of lanthanum hydroxide, strontium carbonate, and basic nickel carbonate are added to deionized water for dissolving, and then diethylenetriaminepentaacetic acid is added (the molar ratio of diethylenetriaminepentaacetic acid to the total amount of metal ions added is 1.9:3), to obtain a mixed solution with a concentration of 0.1mol / L. Aqueous ammonia was added dropwise to adjust the pH of the mixed solution to 8, followed by stirring in a constant temperature water bath at 90° C. for 2 h to obtain a clear and transparent precursor solution A.

[0026] According to Ce 0.8 SM 0.2 o 1.9 The stoichiometric ratio of cerium nitrate and samarium nitrate was added to deionized water for dissolution, and then urea was added (the molar ratio of urea to the total amount of metal ions added was 1.8:1) to obtain a mixed solution with a concentration of 0.1mol / L. Aqueous ammonia was added dropwise to adjust the pH of t...

Embodiment 2

[0033] According to La 1.8 Sr 0.2 NiO 4+δ The stoichiometric ratio of lanthanum hydroxide, strontium carbonate, and basic nickel carbonate are added to deionized water for dissolving, and then diethylenetriaminepentaacetic acid is added (the molar ratio of diethylenetriaminepentaacetic acid to the total amount of metal ions added is 2.4:3), to obtain a mixed solution with a concentration of 0.2mol / L. Aqueous ammonia was added dropwise to adjust the pH of the mixed solution to 9, followed by stirring in a constant temperature water bath at 90° C. for 2 h to obtain a clear and transparent precursor solution A.

[0034] According to Ce 0.8 SM 0.2 o 1.9 The stoichiometric ratio of cerium nitrate and samarium nitrate was added to deionized water for dissolution, and then urea was added (the molar ratio of urea to the total amount of metal ions added was 1.2:1) to obtain a mixed solution with a concentration of 0.2mol / L. Aqueous ammonia was added dropwise to adjust the pH of t...

Embodiment 3

[0038] According to La 1.8 Sr 0.2 NiO 4+δ The stoichiometric ratio of lanthanum hydroxide, strontium carbonate, and basic nickel carbonate are added to deionized water for dissolving, and then diethylenetriaminepentaacetic acid is added (the molar ratio of diethylenetriaminepentaacetic acid to the total amount of metal ions added is 2.2:3), to obtain a mixed solution with a concentration of 0.3mol / L. Aqueous ammonia was added dropwise to adjust the pH of the mixed solution to 8, followed by stirring in a constant temperature water bath at 90° C. for 2 h to obtain a clear and transparent precursor solution A.

[0039] According to Ce 0.8 SM 0.2 o 1.9 The stoichiometric ratio of cerium nitrate and samarium nitrate was added to deionized water to dissolve, and then urea was added (the molar ratio of urea to the total amount of metal ions added was 1.5:1) to obtain a mixed solution with a concentration of 0.3mol / L. Aqueous ammonia was added dropwise to adjust the pH of the m...

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Abstract

The invention relates to a preparation method of La1.8Sr0.2NiO4+delta-Ce0.8Sm0.2O1.9 composite cathode powder. The preparation method comprises the following steps: firstly, according to the stoichiometric ratio of La1.8Sr0.2NiO4+delta and Ce0.8Sm0.2O1.9, a lanthanum source, a strontium source, a nickel source, amino polycarboxylic acid, a cerium source, a samarium source, urea and water are usedas raw materials to prepare two alkalescent precursor solutions respectively; then, the two precursor solutions are mixed in proportion and heated to obtain sol, and then, the sol is rapidly dried toobtain a solid precursor; and finally, the solid precursor is ground and subjected to heat treatment to obtain target powder. The method disclosed by the invention has the advantages of simple and feasible process, low preparation temperature and the like; the components in the obtained composite system powder are uniformly mixed, and the particles are fine, and the components can be used for manufacturing a cathode of a medium-temperature solid oxide fuel cell; and tests show that the cathode has relatively low polarization resistance.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a chemical expression of La 1.8 Sr 0.2 NiO 4+δ -Ce 0.8 SM 0.2 o 1.9 The composite system cathode powder material and its preparation method. Background technique [0002] A solid oxide fuel cell (SOFC) is an energy conversion device that can directly convert chemical energy stored in fuel into electrical energy. The basic composition of SOFC includes anode, cathode and electrolyte. The main function of the cathode is to catalyze the oxygen reduction reaction on the surface of the cathode and collect current. The SOFC cathode material has an important impact on the performance of SOFC. [0003] How to reduce the working temperature of SOFC to the medium temperature range (600-800°C) is the main development direction of SOFC technology. K 2 NiF 4 Structure (A 2 BO 4 ) of La 2 NiO 4+δ Ion-electron mixed conductors are a novel candidate material for intermedi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90B82Y40/00
CPCB82Y40/00H01M4/8647H01M4/9016Y02E60/50
Inventor 徐庆郭金虎黄端平解肖斌张枫
Owner WUHAN UNIV OF TECH