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Method for hydrothermal synthesis of Ba-doped Sr2Fe1.5Mo0.5O6 double perovskite nano material

The technology of sr2fe1.5mo0.5o6 and sr2-xbaxfe1.5mo0.5o6 is applied in the field of anode material preparation of solid oxide fuel cells, and can solve the problem of high sintering temperature, poor crystal form, and reduction of anode materials of solid oxide fuel cells. performance and other issues, to achieve the effect of good performance and high value

Active Publication Date: 2021-02-26
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the main methods for preparing double perovskite electrode materials are traditional solid-phase method, co-precipitation method and sol-gel method, etc. These methods have problems such as poor crystal form, high sintering temperature, and long heat treatment time, which reduce the cost of solid phase. Properties of Anode Materials for Oxide Fuel Cells

Method used

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  • Method for hydrothermal synthesis of Ba-doped Sr2Fe1.5Mo0.5O6 double perovskite nano material
  • Method for hydrothermal synthesis of Ba-doped Sr2Fe1.5Mo0.5O6 double perovskite nano material
  • Method for hydrothermal synthesis of Ba-doped Sr2Fe1.5Mo0.5O6 double perovskite nano material

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Experimental program
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Effect test

Embodiment 1

[0020] According to the double perovskite anode material Sr 2 Fe 1.5 Mo 0.5 o 6 In the stoichiometric ratio of Sr, Fe and Mo, Sr(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O and (NH 4 ) 6 Mo 7 o 24 4H 2 O was added to the water one by one.

[0021] Then add complexing agent citric acid and dispersant polyethylene glycol, the molar ratio of citric acid to all metal ions is 1.5: 1, and the molar ratio of polyethylene glycol to all metal ions is 1:1.

[0022] Ammonia water was added to adjust the pH of the solution to about 4 to obtain a precursor solution prepared by a hydrothermal method.

[0023] Pour the precursor solution into the hydrothermal reaction kettle, the volume of the solution is about 60%~70%, seal the reaction kettle and put it into the oven. The oven temperature is 220 o C~260 o C, the reaction time is 18~24 hours.

[0024] After taking out the reactants, the product was centrifuged at 8000 r / min for 5 minutes using absolute ethanol as a solvent, the above ope...

Embodiment 2

[0030] According to the double perovskite anode material Sr 1.75 Ba 0.25 Fe 1.5 Mo 0.5 o 6 In the stoichiometric ratio of Sr, Ba, Fe and Mo, Sr(NO 3 ) 2 , Ba(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O and (NH 4 ) 6 Mo 7 o 24 4H 2 O was added to the water one by one.

[0031] Then add complexing agent citric acid and dispersant polyethylene glycol, the molar ratio of citric acid to all metal ions is 1.5: 1, and the molar ratio of polyethylene glycol to all metal ions is 1:1.

[0032] Ammonia water was added to adjust the pH value of the solution to about 4 to obtain a precursor solution prepared by a hydrothermal method.

[0033] Pour the precursor solution into the hydrothermal reaction kettle, the volume of the solution is about 60%~70%, seal the reaction kettle and put it into the oven. The oven temperature is 220 o C~260 o C, the reaction time is 18~24 hours.

[0034] After taking out the reactants, the product was centrifuged at 8000 r / min for 5 minutes using absolu...

Embodiment 3

[0042] According to the double perovskite anode material Sr 1.5 Ba 0.5 Fe 1.5 Mo 0.5 o 6 The stoichiometric ratio of Sr, Ba, Fe and Mo in Sr(NO 3 ) 2 , Ba(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O and (NH 4 ) 6 Mo 7 o 24 4H 2 O was added to the water one by one.

[0043] Then add complexing agent citric acid and dispersant polyethylene glycol, the molar ratio of citric acid to all metal ions is 1.5: 1, and the molar ratio of polyethylene glycol to all metal ions is 1:1.

[0044] Ammonia water was added to adjust the pH value of the solution to about 4 to obtain a precursor solution prepared by a hydrothermal method.

[0045] Pour the precursor solution into the hydrothermal reaction kettle, the volume of the solution is about 60%~70%, seal the reaction kettle and put it into the oven. The oven temperature is 220 o C~260 o C, the reaction time is 18~24 hours.

[0046] After taking out the reactants, the product was centrifuged at 8000 r / min for 5 minutes using absolute ...

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Abstract

The invention discloses a method for hydrothermal synthesis of a Ba-doped Sr2Fe1.5Mo0.5O6 double perovskite nano material. The method comprises the following steps: according to stoichiometric numbersof Sr, Ba, Fe and Mo in the double perovskite anode material Sr2-xBaxFe1.5Mo0.5O6, sequentially adding Sr(NO3)2, Ba(NO3)2, Fe(NO3)3.9H2O and (NH4)6Mo7O24.4H2O into water, wherein x is larger than 0 and smaller than or equal to 1; then adding a complexing agent citric acid and a dispersing agent polyethylene glycol; adjusting the pH value to 3-5 to obtain a precursor solution; carrying out hydrothermal reaction on the precursor solution at 220 DEG C to 260 DEG C, centrifuging, cleaning and drying; and calcining the obtained dried product at 950-1150 DEG C in a calcining atmosphere of 5-10% H2 / N2 to obtain the nano material. The double-perovskite anode material prepared by the method is relatively good in phase structure, is relatively stable in a reducing atmosphere when being used as an anode material of a solid oxide fuel cell, is relatively good in thermal matching property with electrolyte GDC, and can improve the performance of the anode material of the solid oxide fuel cell.

Description

technical field [0001] The invention belongs to the technical field of solid oxide fuel cell anode material preparation, in particular to a Ba-doped Sr 2 Fe 1.5 Mo 0.5 o 6 Preparation method of double perovskite nanomaterials. Background technique [0002] Solid oxide fuel cells (SOFC) have low sensitivity to impurities in fuel, and at the same time have higher energy conversion efficiency, all-solid-state mechanical structure, and do not require noble metal catalysts, etc., and have become the focus of scientific research and industry. The selection of anode materials will have an important impact on its performance and long-term stability. Therefore, continuous improvement of material performance and battery preparation process is the focus of developing high-performance SOFCs. Traditional SOFC fuels are usually H 2 , but due to the current high cost of hydrogen production and difficult transportation, the most suitable fuel gas for SOFC is still hydrocarbon fuel gas,...

Claims

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Application Information

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IPC IPC(8): C01G49/00H01M4/90H01M4/88
CPCC01G49/0036H01M4/9033H01M4/8825H01M4/8882C01P2002/34Y02E60/50
Inventor 周娟蒲江戈刘超
Owner NANJING UNIV OF SCI & TECH
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