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Solid oxide electrolytic cell cathode material and preparation method and application thereof

A solid oxide and cathode material technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of poor redox stability, low ion conductivity, electrode loss of activity, etc., to achieve redox stability and high conductivity , the effect of high comprehensive electrochemical performance

Active Publication Date: 2014-09-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although Ni-YSZ has many advantages (such as high electrical conductivity, low cost, etc.), there are some unresolved problems in the application of this material: such as poor redox stability, low ionic conductivity at low temperature, agglomeration of Ni particles at high temperature, Ni volatilizes at high temperature, is easily affected by various impurity elements, which leads to battery performance degradation, etc.
In addition, the high-temperature and high-humidity working environment of the cathode of the solid oxide electrolytic cell exposes new problems to the Ni-YSZ material: the Ni particles in the Ni-YSZ are more likely to be oxidized to form a passivation layer, thereby deactivating the entire electrode, and the overall performance of the battery The performance is reduced, and the catalytic activity of Ni-YSZ material to catalyze water splitting under high temperature and high humidity is not high enough
[0003] Therefore, the research on cathode materials for oxide electrolytic cells still needs to be in-depth

Method used

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  • Solid oxide electrolytic cell cathode material and preparation method and application thereof
  • Solid oxide electrolytic cell cathode material and preparation method and application thereof
  • Solid oxide electrolytic cell cathode material and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0052] 1. Preparation

[0053] Synthesis of double perovskite Sr by solid-state reaction method 2 FeNbO 6 (Mn doping amount is taken as 0) powder, the specific operation is as follows:.

[0054] First, according to the molar ratio Sr(CO 3 ) 2 :Fe 2 o 3 :Nb 2 o 5 = 4:1:1 weigh the required raw material Sr(CO 3 ) 2 , Fe 2 o 3 , Nb 2 o 5 Next, put the weighed raw materials in a nylon ball mill jar, add an appropriate amount of absolute ethanol, mix and ball mill for 24 hours, then place the ball milled slurry in a 60°C oven to dry for 2 hours, and then sieve, Subsequently, the powder mixture obtained by sieving was placed in an alumina crucible, and calcined at 1200°C for 12 hours in air to obtain Sr 2 FeNbO 6 .

[0055] 2. Characterization

[0056] (1) The structural stability of the double perovskite was studied by X-ray diffraction method, and the obtained Sr 2 FeNbO 6 The X-ray diffraction pattern of figure 1 shown. Depend on figure 1 It can be seen that...

Embodiment 2

[0064] Prepare double perovskite Sr according to the method of embodiment 1 2 Fe 0.8 mn 0.2 NbO 6 Powder, the difference is that the composition of raw materials and the molar ratio of each component are Sr(CO 3 ) 2 :Fe 2 o 3 :MnO 2 :Nb 2 o 5 =2:0.4:0.2:0.5.

[0065] Study on the obtained Sr by X-ray diffraction method 2 Fe 0.8 mn 0.2 NbO 6 The stability of the double perovskite structure of the powder, the prepared Sr 2 Fe 0.8 mn 0.2 NbO 6 The X-ray diffraction spectrum of the powder is shown in Figure 4 . from Figure 4 It can be seen that the prepared Sr 2 Fe 0.8 mn 0.2 NbO 6 The powder has a stable and single Sr 2 Fe 0.8 mn 0.2 NbO 6 double perovskite structure.

[0066] According to the method of embodiment 1, to prepare the obtained Sr 2 Fe 0.8 mn 0.2 NbO 6 As the cathode material, prepare Sr 2 Fe 0.8 mn 0.2 NbO 6 -YSZ electrolytic cell, and test its hydrogen production rate, at the same time, set Ni-YSZ as a control. The hydrogen pr...

Embodiment 3

[0068] Prepare double perovskite Sr according to the method of embodiment 1 2 Fe 0.9 mn 0.1 NbO 6 Powder, the difference is that the composition of raw materials and the molar ratio of each component are Sr(CO 3 ) 2 :Fe 2 o 3 :MnO 2 :Nb 2 o 5 =2:0.45:0.1:0.5.

[0069] Study on the obtained Sr by X-ray diffraction method 2 Fe 0.9 mn 0.1 NbO 6 The stability of the double perovskite structure of the powder, the prepared Sr 2 Fe 0.9 mn 0.1 NbO 6 The X-ray diffraction spectrum of the powder is shown in Image 6 . from Image 6 It can be seen that the prepared Sr 2 Fe 0.9 mn 0.1 NbO 6 The powder has a stable and single Sr 2 Fe 0.9 mn 0.1 NbO 6 double perovskite structure.

[0070] According to the method of embodiment 1, to prepare the obtained Sr 2 Fe 0.9 mn 0.1 NbO 6 As the cathode material, prepare Sr 2 Fe 0.9 mn 0.1 NbO 6 -YSZ electrolytic cell, and test its hydrogen production rate, at the same time, set Ni-YSZ as a control. The hydrogen produ...

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Abstract

The invention provides a solid oxide electrolytic cell cathode material and a preparation method and application thereof, specifically application of a Sr2Fe1-xB2xB'O6 material to the preparation of a solid oxide electrolytic cell cathode material, wherein B2 and B' are transition metal elements, and x is the relative amount of doping and x satisfies the relation of 0<=x<=1. The material as the cathode material of the solid oxide electrolytic cell is suitable for working in the high temperature and high humidity environment of the electrolytic cell cathode side, has the characteristics of stable structure, redox stability, high mixed conductivity and high catalytic activity; and the solid oxide electrolytic cell uses the material as the cathode material has high integrated electrochemical performance in the high temperature electrolysis of water vapor and has high rate of water electrolysis hydrogen production.

Description

technical field [0001] The invention relates to the technical field of new materials and energy, in particular to a cathode material for a solid oxide electrolytic cell and a preparation method and use thereof. Background technique [0002] The key material of solid oxide electrolytic cells is a research hotspot in the field of energy materials today. At present, the most commonly used cathode materials for solid oxide electrolytic cells are metal Ni and Y stabilized ZrO 2 Composite porous electrode material (Ni-YSZ). Although Ni-YSZ has many advantages (such as high electrical conductivity, low cost, etc.), there are some unresolved problems in the application of this material: such as poor redox stability, low ionic conductivity at low temperature, agglomeration of Ni particles at high temperature, Ni volatilizes at high temperature, is easily affected by various impurity elements and causes battery performance to decline, and so on. In addition, the high-temperature and...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B1/04
CPCY02E60/36
Inventor 马景陶葛奔艾德生林旭平邓长生
Owner TSINGHUA UNIV
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