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Synthesis method of Ln0.3Sr0.7Fe0.7Cr0.3O<3-delta> ion electronic mixed conductor material

A synthesis method and technology of mixed conductors, which are applied in chemical instruments and methods, circuits, electrical components, etc., can solve the problems of not fully meeting the coordination requirements of rare earth metal ions and cannot be highly ordered combination, and achieve fine particles and make up for coordination. Insufficient positional ability, effect of strong coordination ability

Active Publication Date: 2018-08-03
WUHAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

But in the synthesis of Ln 0.3 Sr 0.7 Fe 1-x Cr x o 3-δ When diethylenetriaminepentaacetic acid is an octadentate complex, it does not fully meet the coordination requirements of rare earth metal ions, and the insufficient ligands are supplemented by water molecules, which cannot make various reactant ions on the atomic and molecular scales To achieve a highly ordered combination, it cannot completely solve the problem of easy formation of impurity phases due to the large difference in ionic radius between the Sr ion at the A site and the rare earth ion. This method still requires a higher synthesis temperature (1200 ° C) to obtain a single Synthetic products of perovskite structure

Method used

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  • Synthesis method of Ln0.3Sr0.7Fe0.7Cr0.3O&lt;3-delta&gt; ion electronic mixed conductor material
  • Synthesis method of Ln0.3Sr0.7Fe0.7Cr0.3O&lt;3-delta&gt; ion electronic mixed conductor material
  • Synthesis method of Ln0.3Sr0.7Fe0.7Cr0.3O&lt;3-delta&gt; ion electronic mixed conductor material

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Experimental program
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Effect test

Embodiment 1

[0023] By product Pr 0.3 Sr 0.7 Fe 0.7 Cr 0.3 o 3-δ The stoichiometric ratio of the corresponding Pr, Sr, Fe, Cr nitrates were respectively weighed, dissolved in deionized water in turn, and then added diethylenetriaminepentaacetic acid and triethylenetetraminehexaacetic acid, diethylenetriaminepentaacetic acid, The molar ratio of triethylenetetraminehexaacetic acid to the total amount of various metal ions is 0.7:0.6:1.0. An appropriate amount of ammonia water was added dropwise to the mixed solution to adjust its pH value to 7-8, and the mixed solution was heated to 90° C. and stirred for 4 hours in a water bath to form a clear and transparent precursor solution. After the precursor solution is heated to 100°C and aged for 24 hours, a solid precursor is obtained. Finally, the solid precursor was ground and heat-treated at 1000°C for 2 hours, and the obtained black fine powder was the synthesis product.

[0024] The synthesized powder product was analyzed by XRD, SEM an...

Embodiment 2

[0026] By product Nd 0.3 Sr 0.7 Fe 0.7 Cr 0.3 o 3-δ Weigh the corresponding nitrates of Nd, Sr, Fe, Cr respectively, dissolve them in deionized water in sequence, then add diethylenetriaminepentaacetic acid and triethylenetetraminehexaacetic acid, diethylenetriaminepentaacetic acid, The molar ratio of triethylenetetraminehexaacetic acid to the total amount of various metal ions is 0.7:0.5:1.0. An appropriate amount of ammonia water was added dropwise to the mixed solution to adjust its pH value to 7-8, and the mixed solution was heated to 80° C. and stirred for 5 hours in a water bath to form a clear and transparent precursor solution. After the precursor solution is heated to 100°C and aged for 20 hours, a solid precursor is obtained. Finally, the solid precursor was ground and heat-treated at 1000°C for 3 hours, and the obtained black fine powder was the synthesis product.

[0027] After testing, the Nd prepared in this embodiment 0.3 Sr 0.7 Fe 0.7 Cr 0.3 o 3-δ Th...

Embodiment 3

[0029] By product Sm 0.3 Sr 0.7 Fe 0.7 Cr 0.3 o 3-δ Weigh the corresponding nitrates of Sm, Sr, Fe, Cr respectively, dissolve them in deionized water in turn, then add diethylenetriaminepentaacetic acid and triethylenetetraminehexaacetic acid, diethylenetriaminepentaacetic acid, The molar ratio of triethylenetetraminehexaacetic acid to the total amount of various metal ions is 0.8:0.6:1.0. An appropriate amount of ammonia water was added dropwise to the mixed solution to adjust its pH value to 7-8, and the mixed solution was heated to 85° C. and stirred for 6 hours in a water bath to form a clear and transparent precursor solution. After the precursor solution is heated to 100°C and aged for 24 hours, a solid precursor is obtained. Finally, the solid precursor was ground and heat-treated at 1030°C for 2 hours, and the obtained black fine powder was the synthesis product.

[0030] After testing, the Sm prepared in this example 0.3 Sr 0.7 Fe 0.7 Cr 0.3 o 3-δ The powde...

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Abstract

The invention relates to a synthesis method of a Ln0.3Sr0.7Fe0.7Cr0.3O<3-delta> ion-electronic mixed conductor material. The method comprises the steps: firstly, dissolving nitrate of Ln, Sr, Fe and Cr in water; then, adding diethylenetriamine pentaacetic acid and triethylene tetramine hexaacetic acid and regulating pH of the solution to be alkaline, performing hydrothermal reaction and then continuing heating and aging to obtain a solid precursor; and finally, grinding and thermal processing at high temperature so as to obtain the Ln0.3Sr0.7Fe0.7Cr0.3O<3-delta> ion-electronic mixed conductormaterial. The synthesis method has the advantages of low synthesis temperature and fine and uniform product particle and the like, and the obtained powder can be used for preparing a cathode of a medium-temperature solid oxide fuel battery.

Description

technical field [0001] The present invention relates to ABO 3 Type perovskite material technical field, specifically relate to a kind of Ln 0.3 Sr 0.7 Fe 0.7 Cr 0.3 o 3-δ Ionic-electronic mixed conductor materials and their synthesis methods. Background technique [0002] La 0.3 Sr 0.7 Fe 1-x Cr x o 3-δ (x=0.1-0.3) is an ABO 3 Type perovskite structure compound, in the temperature range of 600-800 ℃ and a wide range of oxygen partial pressure, has high structural stability and excellent ion-electronic mixed conductivity, and has excellent oxygen reduction The electrocatalytic activity is very promising as a cathode candidate material for intermediate temperature solid oxide fuel cells. However, La 0.3 Sr 0.7 Fe 1-x Cr x o 3-δ The thermal expansion coefficient is too high, and its average thermal expansion coefficient in the temperature range of 50-900°C is (16×10 -6 -19×10 -6 )K -1 , it is difficult to combine with electrolyte materials of intermediate te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00H01M4/90
CPCC01G49/009C01P2002/34C01P2002/72C01P2004/03C01P2004/62C01P2006/32H01M4/9016Y02E60/50
Inventor 徐庆黄端平张枫刘会栋肖静林露解肖斌
Owner WUHAN UNIV OF TECH
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