High-conductivity double-perovskite-type anode material and preparation method thereof

An anode material, double perovskite technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems affecting battery output power, electrode polarization, and large gaps in requirements, and achieve reduced electron migration activation energy, electrical conductivity, etc. The effect of improving and improving the migration ability

Active Publication Date: 2012-07-18
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Doping Nb and W at the Mo site of Sr2MgMoO6, although the ionic conductivity has a certain increase, but the electronic conductivity drops a lot, at 800 The conductivity of doped Nb and W in 5 % H2 / Ar atmosphere at oC are 0.29 S / cm and 0.12 S / cm, respectively (S. Vasala, M. Lehtim ?ki, S.C. Haw, et al. Isovalent and aliovalent substitution effects on redox chemistry of Sr2MgMoO6-δSOFC-anode material, Solid State Ionics, 2010(181 ):754–759)
These values ​​are far from the conductivity requirements of SOFC anode materials, and it is difficult to meet the actual needs. The low conductivity can easily cause electrode polarization, which in turn affects the output power of the battery.

Method used

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  • High-conductivity double-perovskite-type anode material and preparation method thereof
  • High-conductivity double-perovskite-type anode material and preparation method thereof
  • High-conductivity double-perovskite-type anode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] In order to illustrate the effect of B-site Y doping on Sr 2 MgO 6 The electrical conductivity of the type double perovskite anode material is significantly improved, and a comparative sample, that is, Example 1, is specially made.

[0029] Synthesis of Sr by Citric Acid-Combustion Method 2 MgO 6-δ (x=0) Dense sample. According to Sr 2 MgO 6-δ Stoichiometric ratio preparation, the Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O and (NH 4 ) 6 MO 7 o 24 4H 2 O was dissolved in deionized water, and citric acid was added at a ratio of 1:2 between metal ions and citric acid, and stirred continuously to form a uniform solution. The solution at 70-90 o C water bath to obtain a homogeneous sol. Place the sol in an oven at 80 o C keep warm to get xerogel, then at 250 o C is heated until it self-combusts to form very fluffy Sr 2 MgO 6-δ Precursor powder. Grind the powder and put it into an electric furnace for roasting at a temperature of 800 o C, the holding time is 6 h...

Embodiment 2

[0032] Synthesis of Sr by Citric Acid-Combustion Method 2 Mg 1-x Y x MoO 6-δ (x=0.1) Dense sample. According to Sr 2 Mg 1-x Y x MoO 6-δ (x=0.1) stoichiometric ratio preparation, the Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, Y (NO 3 ) 3 ·6H 2 O and (NH 4 ) 6 MO 7 o 24 4H 2 O was dissolved in deionized water, and citric acid was added at a ratio of 1:2 between metal ions and citric acid, and stirred continuously to form a uniform solution. Then at 70-90 o C water bath to obtain a homogeneous sol, the sol in an oven for 80 o C to keep dry gel, then 250 o C is heated until it self-combusts to form very fluffy Sr 2 Mg 1-x Y x MoO 6-δ (x = 0.1) Precursor powder. Grind the powder and put it into an electric furnace for roasting at a temperature of 800 o C, the holding time is 6 h, so that the organic matter in it can be fully decomposed. The roasted powder was ground and sieved again, and the sieved powder was added into a 1% PVA solution, ground evenly, and the...

Embodiment 3

[0035] Synthesis of Sr by Citric Acid-Combustion Method 2 Mg 1-x Y x MoO 6-δ (x=0.2) Dense sample. According to Sr 2 Mg 1-x Y x MoO 6-δ (x=0.2) stoichiometric ratio preparation, the Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, Y (NO 3 ) 3 ·6H 2 O and (NH 4 ) 6 MO 7 o 24 4H 2 O was dissolved in deionized water, and citric acid was added at a ratio of 1:2 between metal ions and citric acid, and stirred continuously to form a uniform solution. Then the solution at 70-90 o C water bath to obtain a homogeneous sol, the sol in an oven for 80 o C to keep dry gel, then 250 o C is heated until it self-combusts to form very fluffy Sr 2 Mg 1-x Y x MoO 6-δ (x = 0.2) Precursor powder. Grind the powder and put it into an electric furnace for roasting at a temperature of 800 oC, the holding time is 6 h, so that the organic matter in it can be fully decomposed. The roasted powder was ground and sieved again, and the sieved powder was added to a 1% PVA solution, ground evenl...

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Abstract

The invention discloses a high-conductivity double-perovskite-type anode material and a preparation method thereof and belongs to the field of solid oxide fuel cells. The high-conductivity double-perovskite-type anode material is characterized in that a B site of a double-perovskite-type (A2BB'O6) solid oxide fuel cell anode material Sr2MgMoO6 is doped with Y so that the high-conductivity double-perovskite-type anode material which is a mixed conductor having a double-perovskite structure is obtained. The preparation method provided by the invention comprises the following steps of pressing B site-doped Sr2Mg1-xYxMoO6 powder (x is in a range of 0.1 to 0.2) into a sample strip under certain pressure, carrying out sintering at a high temperature in an air atmosphere, carrying out reduction under reduction conditions, and carrying out conductivity measuring, wherein compared with a conductivity measured before doping, a conductivity measured after doping is improved 5.8 times (x=0.2). Through the preparation method provided by the invention, the high-conductivity double-perovskite-type anode material which is a porous film-type anode material Sr2Mg1-xYxMoO6 (x is in a range of 0.1 to 0.2) is obtained, and has good combinability and good chemical compatibility with electrolytes of GDC and LSGM, and carbon distribution-resistant and sulfur poisoning-resistant capabilities higher than carbon distribution-resistant and sulfur poisoning-resistant capabilites of the traditional anode material.

Description

[0001] technical field [0002] 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 method of performing Y-doping on the B-site to improve its conductivity. Background technique [0003] With the development of global industry and the rapid growth of population, energy resources on the earth are becoming more and more scarce. Therefore, it has become an important direction for the development of the world today to seek new energy technologies with high energy conversion efficiency and environmental friendliness. Among them, solid oxide fuel Batteries have been recognized as one of the most promising energy technologies in the 21st century. A solid oxide fuel cell is a power generation device that converts chemical energy stored in fuel and oxidant directly into electrical energy. Compared with other energy technologies, solid oxide fuel cells have the advantages of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90
CPCY02E60/50
Inventor 赵海雷杜志鸿谢志翔夏青王捷
Owner UNIV OF SCI & TECH BEIJING
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