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A A-site vacancy type perovskite oxygen catalyst, a preparation method and application thereof

An oxygen catalyst and perovskite technology, which is applied in the field of A-site-deficient perovskite oxygen catalyst and its preparation, can solve the problems of reducing fuel cell production and use costs, low catalytic activity, poor stability, etc., and reach the limit of improvement High current density, high catalytic activity, and low cost

Inactive Publication Date: 2018-12-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the ubiquitous problems of high cost, low catalytic activity and poor stability in existing fuel cell oxygen catalysts, and creatively utilize perovskite materials with A-site vacancy to improve the catalytic activity and stability of the catalyst. Since the raw materials do not contain any precious metals, the production and use costs of fuel cells are greatly reduced

Method used

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  • A A-site vacancy type perovskite oxygen catalyst, a preparation method and application thereof
  • A A-site vacancy type perovskite oxygen catalyst, a preparation method and application thereof
  • A A-site vacancy type perovskite oxygen catalyst, a preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Weigh 5.76 g of lanthanum nitrate, 1.87 g of strontium nitrate, and 6.46 g of cobalt nitrate according to the stoichiometric ratio La:Sr:Co=0.6:0.4:1, and dissolve them in 300 mL of deionized water. Add complexing agent citric acid 17.06g, EDTA12.975g to the solution according to the ratio of total moles of metal ions: citric acid moles: EDTA moles=1:2:1, then add ammonia water to adjust the pH value=7 of the solution, Finally heated to 80°C with magnetic stirring for 10h to obtain La 0.6 Sr 0.4 CoO 3 Precursor gel.

[0032] The obtained precursor gel was dried in an oven at 150°C for 10 hours, and the gel-like liquid gradually turned into a fluffy black solid. Grinding the black solid into a powder in a mortar gave La 0.6 Sr 0.4 CoO 3 Precursor powder.

[0033] The prepared black precursor powder sample was placed in a 100mL corundum crucible, raised from room temperature to 500°C at a rate of 2°C / min, and kept at 500°C for 2 hours to remove excess citric acid an...

Embodiment 2

[0035] Weigh 5.62 g of lanthanum nitrate, 1.83 g of strontium nitrate, and 6.635 g of cobalt nitrate according to the stoichiometric ratio La:Sr:Co=0.57:0.38:1, and dissolve them in 300 mL of deionized water. Add complexing agent citric acid 17.06g, EDTA12.99g to the solution according to the ratio of total moles of metal ions: citric acid moles: EDTA moles=1:2:1, then add ammonia water to adjust the pH value of the solution=7, Finally, it was heated to 80° C. and magnetically stirred for 10 h to obtain a precursor gel.

[0036] The above precursor gel was dried in an oven at 150°C for 10 hours, and the gel-like liquid gradually turned into a fluffy black solid. Grinding the black solid into a powder in a mortar gave (La 0.6 Sr 0.4 ) 0.95 CoO 3 Precursor powder.

[0037] Put the black precursor powder sample in a 100mL corundum crucible, raise the temperature from room temperature to 500°C at a rate of 2°C / min, and keep it at 500°C for 2 hours; then continue to heat up fr...

Embodiment 3

[0040] Weigh 4.91 g of lanthanum nitrate, 2.40 g of strontium nitrate, and 6.60 g of cobalt nitrate according to the stoichiometric ratio La:Sr:Co=0.5:0.5:1, and dissolve them in 300 mL of deionized water. Add complexing agent citric acid 17.45g, EDTA13.27g according to the ratio of total moles of metal ions: moles of citric acid: moles of EDTA=1:2:1, then add ammonia water to adjust the pH value of the solution=7, and finally heat to Magnetic stirring at 80° C. for 10 h to obtain a precursor gel.

[0041] The above precursor gel was dried in an oven at 150°C for 10 hours, and the gel-like liquid gradually turned into a fluffy black solid. Grinding the black solid into a powder in a mortar gave La 0.5 Sr 0.5 CoO 3 Precursor powder.

[0042] Place the prepared black precursor powder sample in a 100mL corundum crucible, raise the temperature from room temperature to 500°C at a rate of 2°C / min, and keep it at 500°C for 2 hours; then continue to heat up from 500°C to 1000°C, ...

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Abstract

The invention relates to an A-site vacancy type perovskite oxygen catalyst and a preparation method and application thereof, which mainly solves the problems of high cost and poor stability of the current fuel cell oxygen electrode catalyst. As the sol-gel method and the calcination process are adopted, the A site vacancy and the increase of B site valence of perovskite are realized, Furthermore,the oxygen vacancy number is increased, the electronic structure of the B site is changed, and the electrochemical oxygen reduction performance of the perovskite catalyst is improved essentially. Moreover, the application of alkaline environment can better protect the catalytic activity of metal elements at the B site, and greatly improve the stability of the perovskite catalyst. Compared with thecommercially available platinum-carbon noble metal catalyst, the perovskite type oxygen catalyst has improved performance and reduced cost through vacancy treatment of the A site and doping of metalelements with smaller ion radius, and has good application prospect in alkaline fuel cells in the future.

Description

technical field [0001] The invention relates to the technical field of catalysts and fuel cells, in particular to an A-site-vacancy type perovskite oxygen catalyst, a preparation method thereof, and an application in fuel cells. Background technique [0002] Hydrogen fuel cell vehicles are the ultimate goal of future vehicle development. They directly convert chemical energy into electrical energy through electrochemical reactions. The reaction is stable, and the product is water without any pollution. Compared with traditional engines that use fossil fuels to perform work through explosions and discharge pollutants, fuel cells, as the next generation of engine power devices, have received extensive attention. However, for this type of battery to be widely used, the cathode must be more prone to the reduction of oxygen, and the anode must also be prone to the oxidation of hydrogen. Compared with the oxidation reaction of hydrogen, the reduction reaction of oxygen is more di...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M8/083
CPCH01M4/9016H01M4/9091H01M8/083Y02E60/50
Inventor 刘毅辉陈昆陈鹏郭冠伦
Owner WUHAN UNIV OF TECH
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