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A kind of perovskite/cerium oxide oxygen catalyst and its desolvation composite preparation method

A composite oxygen catalyst and cerium oxide technology, which is applied in the direction of fuel cell half-cells and primary battery half-cells, structural parts, electrical components, etc. Mechanical performance limitations and other issues to achieve the effect of improving activity, increasing power density, and enhancing interaction

Active Publication Date: 2020-12-15
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its ORR and OER electrocatalytic activities still cannot meet the practical needs
If the currently developed perovskite is used as the cathode catalyst, the discharge kinetics of metal-air batteries will be greatly limited.

Method used

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  • A kind of perovskite/cerium oxide oxygen catalyst and its desolvation composite preparation method
  • A kind of perovskite/cerium oxide oxygen catalyst and its desolvation composite preparation method
  • A kind of perovskite/cerium oxide oxygen catalyst and its desolvation composite preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] With cerium nitrate Ce(NO) 3 ·6H 2 O is the source of Ce, cobalt nitrate Co(NO) 3 ·6H 2 O is the source of cobalt, strontium nitrate Sr(NO 3 ) 2 As the source of strontium, citric acid and EDTA were used as the complexing agent, and the cerium-doped Sr was prepared by the sol-gel method 0.9 Ce 0.1 CoO 3 Perovskite.

[0031]The cerium-doped perovskite is placed in a vacuum ball milling tank, and an argon-hydrogen mixture gas with a hydrogen volume ratio of 5% is introduced into the vacuum ball milling tank to fully discharge the air, and then the argon and hydrogen in the ball milling tank are mixed The pressure of the gas was kept at 5MPa, and the vacuum ball mill jar was placed on a planetary ball mill, and ball milled at room temperature for 48 hours, the ball milling was terminated, and the argon-hydrogen mixture was evacuated to obtain Sr 0.9 Ce 0.1-x CoO 3 / CeO 2 Composite catalyst, take out the sample for later use. The XRD patterns and SEM photos of t...

Embodiment 2

[0034] Using cerium nitrate and cerium oxide as the Ce source, lanthanum oxide as the La source, manganese oxide as the Mn source, and strontium carbonate as the Sr source, cerium-doped (La 0.7 Sr 0.3 ) 0.9 Ce 0.1 MnO 3 Perovskite.

[0035] The cerium-doped perovskite is placed in a vacuum ball milling tank, and an argon-hydrogen mixture gas with a hydrogen volume ratio of 5% is introduced into the vacuum ball milling tank to fully discharge the air, and then the argon and hydrogen in the ball milling tank are mixed The pressure of gas is kept as 5MPa, and the vacuum ball mill jar is placed on the planetary ball mill, and ball milled at room temperature for 48 hours, terminates the ball mill, and evacuates the argon-hydrogen mixed gas to obtain (La 0.7 Sr 0.3 ) 0.9 Ce 0.1-x MnO 3 / CeO 2 Composite catalyst, take out the sample for later use. The XRD patterns and SEM photographs of the synthesized samples illustrate that ball milling in a reducing atmosphere can achiev...

Embodiment 3

[0038] With cerium nitrate Ce(NO) 3 ·6H 2 O is the source of Ce, cobalt nitrate Co(NO) 3 ·6H 2 O is the source of cobalt, strontium nitrate Sr(NO 3 ) 2 As the strontium source, citric acid and EDTA were used as complexing agents, and the cerium-doped Sr was prepared by the sol-gel method. 0.9 Ce 0.1 CoO 3 Perovskite.

[0039] The cerium-doped perovskite is placed in a vacuum ball milling tank, and a nitrogen-hydrogen mixture gas with a hydrogen volume ratio of 10% is introduced into the vacuum ball milling tank to fully discharge the air therein, and then the nitrogen and hydrogen in the ball milling tank are mixed The pressure of the gas is kept at 10MPa, the vacuum ball mill jar is placed on a planetary ball mill, and ball milled at room temperature for 12 hours, the ball mill is terminated, and the nitrogen-hydrogen mixture is emptied to obtain Sr 0.9 Ce 0.1-x CoO 3 / CeO 2 Composite catalyst, take out the sample for later use. The XRD patterns and SEM photos of ...

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Abstract

The invention provides a perovskite / cerium oxide oxygen catalyst preparation method and an application thereof, and especially relates to a perovskite / cerium oxide composite oxygen catalyst prepared by a desolvation composite method. A high-temperature reduction or high-energy atmosphere ball milling method is employed, a second phase (cerium oxide) is precipitated in a material body phase, underdriving with poor concentration, the second phase is diffused to the surface of the material and gradually grown to the nano particles, and in-situ composite of cerium oxide and a catalyst body is realized. Compared with a traditional composite catalyst preparation method, a desolvation composite method is used, The nano particles are subjected to in-situ composite on the surface of the perovskitecatalyst, and interacting between the catalyst body and the composite material can be greatly enhanced, the concerted catalysis effect of the catalyst body and the second phase can be fully performed, the activity of the oxygen catalyst is improved, and the power density of a metal air cell can be increased.

Description

technical field [0001] The invention relates to a perovskite oxygen catalyst, in particular to a preparation method and application of a perovskite / cerium oxide composite oxygen catalyst. Background technique [0002] Since the beginning of the 21st century, problems such as resource shortage, environmental pollution, and greenhouse effect brought about by traditional energy utilization methods have become more prominent. Therefore, traditional energy structures and their utilization methods have become increasingly difficult to meet the needs of human survival and development. In this context, various new green energy sources have been developed rapidly, among which chemical power sources have also received great attention and attention. As a new type of battery technology, metal-air batteries have become a research and development hotspot in the field of chemical power sources due to their safety, environmental protection, low cost, and high energy density. [0003] The m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90H01M12/06
CPCH01M4/8825H01M4/90H01M4/9016H01M12/06
Inventor 苗鹤袁金良王洲航王甫
Owner NINGBO UNIV