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High-conductivity double perovskite aluminum-doped Sr2AlxMg1-xMoO6-Delta anode material and preparation method thereof

A sr2alxmg1-xmoo6-, double perovskite technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems affecting battery output power, polarization, large gaps, etc., to achieve good chemical stability, improve conductivity The effect of improving the conductivity and conductivity

Inactive Publication Date: 2010-10-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] According to D.Marrero-Lopez, J.Pena-Martinez, J.C.Ruiz-Morales, et al.Synthesis, phase stability and electrical conductivity of Sr 2 MgO 6-δ anode, Materials Research Bulletin, 2008(43): 2441-1450 report: Sr 2 MgO 6 At 800°C, 5% H 2 The conductivity in the / Ar atmosphere can reach a maximum of 0.8S / cm. This value is far from the conductivity requirements of SOFC anode materials, and it is difficult to meet the actual needs. The lower conductivity can easily cause electrode polarization, which in turn affects the performance of the battery. Output Power

Method used

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  • High-conductivity double perovskite aluminum-doped Sr2AlxMg1-xMoO6-Delta anode material and preparation method thereof
  • High-conductivity double perovskite aluminum-doped Sr2AlxMg1-xMoO6-Delta anode material and preparation method thereof
  • High-conductivity double perovskite aluminum-doped Sr2AlxMg1-xMoO6-Delta anode material and preparation method thereof

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Embodiment 1

[0026] Synthesis of Sr by Citric Acid-Combustion Synthesis 2 Al x Mg 1-x MoO 6-δ (x=0.01) Dense sample. According to Sr 2 Al x Mg 1-x MoO 6-δ (x=0.01) stoichiometric ratio preparation, Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O and (NH 4 ) 6 MO 7 o 24 4H 2 Dissolve O in deionized water respectively, then add citric acid at a ratio of 1:2 between metal ions and citric acid, and keep stirring to make it evenly mixed. Heat and stir on the muffle furnace until combustion to form Sr 2 Al x Mg 1-x MoO 6-δ (x=0.01) Precursor powder. Grind the powder, put it into an electric furnace for roasting, the temperature is 800°C, and the holding time is 10h, so that the organic matter in it can be fully decomposed. Grind the calcined powder again, sieve, add (binder) polyvinyl alcohol to the sieved powder, mix evenly, and use 115MPa pressure to dry press into rectangular strips in a steel casting mold. At 1500 ° C, sintered in an air atmosphere for 10 h to...

Embodiment 2

[0029] The preparation method and preparation conditions of this embodiment and the above-mentioned embodiment 1 are the same, and its difference from embodiment 1 is that the citric acid-combustion synthesis method is used to synthesize Sr 2 Al x Mg 1-x MoO 6-δ (x=0.02) Dense sample. According to Sr 2 Al x Mg 1-x MoO 6-δ (x=0.02) stoichiometric ratio preparation, Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O and (NH 4 ) 6 MO 7 o 24 4H 2 O was dissolved in deionized water, respectively.

[0030] Using four-terminal lead method at 5%H 2 / Ar atmosphere, the reduction temperature is 1300 ° C, after reduction for 24 hours, the anode material Sr 2 Al x Mg 1-x MoO 6-δ (x=0.02) conductivity. The experimentally measured conductivity reaches 4.47S / cm at 800°C.

Embodiment 3

[0032] The preparation method and preparation conditions of this embodiment and the above-mentioned embodiment 1 are the same, and it is different from embodiment 1 in adopting citric acid-combustion synthesis method to synthesize Sr 2 Al x Mg 1-x MoO 6-δ (x=0.03) Dense sample. According to Sr 2 Al x Mg 1-x MoO 6-δ (x=0.03) stoichiometric ratio preparation, Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O and (NH 4 ) 6 MO 7 o 24 4H 2 O was dissolved in deionized water, respectively.

[0033] Using four-terminal lead method at 5%H 2 / Ar atmosphere, the reduction temperature is 1300 ° C, after reduction for 24 hours, the anode material Sr 2 Al x Mg 1-x MoO 6-δ (x=0.03) conductivity. The experimentally measured conductivity reaches 4.82S / cm at 800°C.

[0034] figure 1 The Sr synthesized by the citric acid-combustion synthesis method for the present invention 2 Al x Mg 1-x MoO 6-δ , x=0.01-0.03 XRD pattern of the powder, the synthesis temperatu...

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Abstract

The invention relates to a high-conductivity double perovskite aluminum-doped Sr2AlxMg1-xMoO6- Delta anode material and a preparation method thereof, which belong to the field of the fuel cell. B site of double perovskite (A2BB'O6) solid oxide fuel cell anode material Sr2MgMoO6 is doped with aluminum to form a mixed conductor of double perovskite structure. Then binder of defined quantity is added to the B site doped Sr2AlxMgxMg1-xMoO6(x=0.01 to 0.1) powder to be compressed to sample strips under a given pressure after being uniformly mixed, the sample strips are sintered at high temperature under the air atmosphere and then are reduced under the low-oxygen condition, the measurement of the conductivity is performed after the reduction, the conductivity is 276 percent higher than that before the doping, thus favoring the improvement of the working property of the electrode. At the same time, the doped Sr2AlxMg1-xMoO6 has higher carbon sedimentation resistance and higher sulfur poisoning resistance than that of the traditional anode material Ni / YSZ.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to a double perovskite type (A 2 BB'O 6 ) Solid oxide fuel cell anode material Sr 2 MgO 6 The B-site is doped with Al to improve its conductivity, and the B-site-doped solid oxide fuel cell double perovskite structure anode material is prepared by a citric acid-combustion synthesis method. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy stored in fuel and oxidant into electrical energy. It is called the fourth generation power generation device after hydropower, thermal power, and nuclear energy and a power device that replaces internal combustion engines. Fuel cells will be One of the most attractive methods of generating electricity in the 21st century. Solid oxide fuel cells have become one of the most promising new energy systems due to their all-solid components, strong adaptability to fuels, and high conversion efficie...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 赵海雷谢志翔周雄徐南生
Owner UNIV OF SCI & TECH BEIJING
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