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Composite material containing perovskite structure oxide, preparation method and application thereof

A perovskite-type, composite material technology, applied in structural parts, fuel cells, electrochemical generators, etc., can solve problems such as low performance, poor oxygen reduction performance, and concentration polarization of porous structure design cells

Active Publication Date: 2014-05-21
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the composite material is used in the cathode of the solid oxide fuel cell, it can solve the problem of poor battery performance due to the low performance of the existing cathode material system after the current solid oxide fuel cell lowers the operating temperature, for example, After reducing the operating temperature, the surface oxygen exchange performance of the existing material system is insufficient, the adsorption process of oxygen on the surface of the cathode is slow, the dissociation of oxygen after being adsorbed, and the slowness of the reduction of dissociated oxygen to obtain electrons (electron transfer process) , Poor oxygen reduction performance due to the slow diffusion of oxygen ions in the cathode; between cathode materials and existing medium and low temperature electrolytes, such as samarium or gadolinium-doped cerium oxide (SDC or GDC) based electrolytes The chemical compatibility of the electrolyte and the cathode material is not good, and the electrolyte and the cathode material will have an electronic or ion insulating phase formed at the interface between the electrolyte and the cathode during the battery preparation or operation, which will reduce the performance of the battery and rapidly decay with time; Or the cathode and certain components in the air such as CO 2 The performance of the cathode material declines due to the reaction; or due to the unreasonable design of the porous structure of the cathode, the battery has serious concentration polarization during the discharge process.
When the composite material is used as a positive electrode material of a solid electrolytic cell, it can solve the problem of poor long-term stability of the battery caused by electrode delamination and interface reaction under the operating conditions of the solid oxide electrolytic cell

Method used

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  • Composite material containing perovskite structure oxide, preparation method and application thereof
  • Composite material containing perovskite structure oxide, preparation method and application thereof
  • Composite material containing perovskite structure oxide, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0111] This example is used to illustrate the perovskite structure oxide Sr 0.95 Ce 0.05 CoO 3-δ and its preparation method.

[0112] Wherein, the present embodiment adopts sol-gel method to prepare Sr 0.95 Ce 0.05 CoO 3-δ , the specific steps include:

[0113] (1) 2g of analytically pure grade strontium nitrate (Sr(NO 3 ) 2 ), and stoichiometric cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) and cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O) dissolved in 110 ml of deionized water to prepare a solution;

[0114] (2) Add 8 ml of ethylene glycol and 2.86 g of citric acid to the above solution respectively, wherein the molar ratios of ethylene glycol and citric acid to the total amount of metal ions are about 7.2 and about 1.5 respectively, and stir on a hot plate at 80°C for 10 hour, a brown gel was obtained;

[0115] (3) Put the prepared brown gel into an oven and dry it at 250°C to obtain a black-gray precursor;

[0116] (4) Grind and press the prepared precursor into tablets, sin...

Embodiment 2

[0120] This example is used to illustrate the perovskite structure oxide Sr 0.9 Ce 0.1 CoO 3-δ and its preparation method.

[0121] Wherein, the present embodiment adopts solid state reaction method to prepare Sr 0.9 Ce 0.1 CoO 3-δ , the specific steps include:

[0122] (1) Add 1g of analytically pure SrO 2 , and the stoichiometric CeO 2 and Co 3 o 4 Grind in an agate mortar to mix well;

[0123] (2) Press the powder obtained by grinding in step (1) into tablets, sinter in air at 1100°C, repeat the grinding, pressing and sintering operations until no impurity phase is detected, and the total sintering time is about 72 hours, that is Perovskite structure oxide Sr can be prepared 0.9 Ce 0.1 CoO 3-δ The sample (SCCO010 for short), numbered No.2.

[0124] Adopt X-ray diffraction method to test the crystal structure of sample, its X-ray diffraction spectrum figure is similar to embodiment 1, and all diffraction peaks can be indexed as a pure tetragonal phase Sr 0.9 C...

Embodiment 3

[0126] This example is used to illustrate the perovskite structure oxide Sr 0.95 Ce 0.05 CoO 3-δ and oxygen ion conductor oxide Sm 0.2 Ce 0.8 o 1.9 (SDC) composite material Sr 0.95 Ce 0.05 CoO 3-δ - SDC and method for its preparation.

[0127] Composite Sr 0.95 Ce 0.05 CoO 3-δ -The concrete preparation method of SDC comprises:

[0128] According to the ratio of 7:3 by weight, the Sm prepared by burning glycine 0.2 Ce 0.8 o 1.9 (abbreviated as SDC, its particle size is about 20 nanometers) and the perovskite structure oxide Sr prepared in Example 1 0.95 Ce 0.05 CoO 3-δ The composite material Sr 0.95 Ce 0.05 CoO 3-δ -SDC (SCCO005+SDC for short), No.3.

[0129] Of course, this embodiment can also use the perovskite structure oxide Sr 0.95 Ce 0.05 CoO 3-δ and Sm 0.2 Ce 0.8 o 1.9 Mix evenly by mechanical grinding.

[0130] It should be pointed out that the purpose of the ball milling or mechanical grinding used in the present invention is to make the mech...

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Abstract

The invention provides a composite material containing a perovskite structure oxide, a preparation method and application thereof. The composite material contains, by weight, 20%-99.99% of the perovskite structure oxide and 0.01%-80% of an oxygen ion conductor oxide. According to the invention, a sol-gel method can be employed to prepare the perovskite structure oxide, a combustion method can be employed to prepare the oxygen ion conductor oxide, and then the perovskite structure oxide and the oxygen ion conductor oxide can be mixed uniformly by means of ball milling or mechanical grinding, thus obtaining the composite material. The invention also relates to application of the composite material in solid oxide fuel cells and solid oxide electrolysis cells.

Description

technical field [0001] The invention relates to a composite material containing a perovskite structure oxide and its preparation method and application, in particular to the application of the composite material in solid oxide fuel cells and solid oxide electrolytic cells. Background technique [0002] Currently, the increasing demand for energy stimulates the research and development of alternative energy conversion and storage systems that are efficient, low-cost, and environmentally friendly. [0003] Solid oxide fuel cells (SOFCs) are a class of electrochemical reactors that can directly convert the chemical energy of fuel gases into electrical energy in an efficient and environmentally friendly manner. figure 1 shown. [0004] Among them, the cathode reaction is: 1 / 2O 2 +2e - →O 2- ; [0005] The anode reaction is: H 2 +O 2- →H 2 O+2e - , [0006] CO+O 2- →CO 2 +2e - , [0007] C n h 2n+2 +(3n+1)O 2- →nCO 2 +(n+1)H 2 O+(6n+2)e ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86
CPCH01M8/1246H01M8/1253H01M8/126H01M2008/1293H01M2300/0074H01M2300/0077Y02E60/50
Inventor 孙春文杨伟马朝晖李帅王少飞陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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