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A three-dimensional ordered macroporous transition metal oxide composite material and its preparation method and catalyst application

A transition metal, three-dimensional ordered technology, applied in the field of three-dimensional ordered macroporous transition metal oxide composite materials and their preparation, can solve the problems of further improvement of electrochemical performance, complex synthesis process, strict synthesis conditions, etc. Application potential and industrial value, high energy density, good stability

Active Publication Date: 2021-10-08
WENZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the synthesis process of this type of material is mostly complicated, the synthesis conditions are relatively strict, and it is difficult to produce on a large scale. In addition, its electrochemical performance needs to be further improved.

Method used

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  • A three-dimensional ordered macroporous transition metal oxide composite material and its preparation method and catalyst application
  • A three-dimensional ordered macroporous transition metal oxide composite material and its preparation method and catalyst application
  • A three-dimensional ordered macroporous transition metal oxide composite material and its preparation method and catalyst application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] S1: Cut the purchased commercial carbon cloth to a certain size, then soak it in a mixture of 98% concentrated sulfuric acid and 12mol / L hydrochloric acid, and reflux it in a fume hood at 80°C for 12 hours;

[0052] S2: After the reaction, disperse a certain amount of PS microspheres (130nm in size) in water, and mix them uniformly by ultrasonic. Use a dropper to drip onto the carbon cloth, heat and evaporate to remove water at a certain temperature in an oven;

[0053] S3: A certain amount of potassium permanganate and carbon powder were evenly dispersed in water, and the carbon cloth treated in S2 was immersed in it, hydrothermally synthesized at 90°C for 12 hours, and then dried at high temperature.

[0054] S4: Another PS microsphere with a smaller pore size (70nm in size) is used to disperse in water, and mix uniformly by ultrasonic. Use a dropper to drip onto the carbon cloth with manganese dioxide, and heat at a certain temperature in an oven to evaporate and re...

Embodiment 2-5

[0057] Embodiment 2-5: the investigation of material consumption ratio in the step S5

[0058] Embodiment 2-5: except that in step S5, the molar ratio of nickel nitrate, ferric nitrate hydrate, ammonium fluoride and urea is replaced by 1:1:1:1, 1:1:1:2, 1:1: 1:3, 1:2:1:2, other operations are all the same, thus repeat the operation of Example 1, thereby carrying out the examples 2-5 in sequence, and the obtained carbon materials are named M2, M3, M4, M5.

Embodiment 6-7

[0059] Embodiment 6-7: the investigation of roasting temperature in the step S6

[0060] Example 6-7: Except that the high-temperature calcination treatment temperature in step S6 was replaced from 300°C to 300°C and 500°C respectively, other operations were unchanged, so that Example 1 was repeated to obtain Example 6-7 in sequence , and the resulting carbon materials are therefore named M6, M7.

[0061] Microscopic representation

[0062] The three-dimensional ordered macroporous transition metal oxide M1 and its precursor obtained in Example 1 were microscopically characterized by a number of different means, and the results are as follows:

[0063] 1. By figure 1 It can be seen from the SEM image that the template PS microsphere layer unit size in the M1 precursor is uniform, highly ordered and dense. By changing the synthesis process, PS microspheres with mixed multilayer structure were obtained, which were densely arranged and agglomerated.

[0064] 2. By figure ...

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Abstract

The invention discloses a three-dimensional ordered macroporous transition metal oxide composite material and its preparation method and catalyst application. The method comprises the following steps: S1: soaking carbon cloth in an acidic solution for pretreatment; S2: soaking PS Disperse the microspheres in water, apply them to the carbon cloth after ultrasonic uniformity, and dry; S3: Disperse potassium permanganate and carbon powder evenly in water, immerse the carbon cloth of S2 in it, conduct a closed reaction and dry to obtain the sample; S4 : Disperse PS microspheres in water, apply them dropwise on the sample of S3 after ultrasonication, and dry; Wherein, a sealing reaction is carried out; S6: calcining the dried sample in S5 to obtain a three-dimensional ordered macroporous transition metal oxide composite material. The invention has the advantages of better ORR and OER performance and good electrochemical performance, and has great application potential and industrial value in the electrochemical field.

Description

technical field [0001] The invention relates to a metal oxide material, in particular to a three-dimensional ordered macroporous transition metal oxide composite material and its preparation method and catalyst application. Background technique [0002] With the development of society and economy, energy and environmental issues have become increasingly prominent, and the world's demand for energy is increasing. Zinc-air fuel cells have attracted widespread attention due to their advantages such as high energy density, low price, safety and reliability, and less environmental pollution. They are one of the next-generation battery technologies with the most commercial prospects. [0003] However, as the most important component of zinc-air batteries, air electrodes usually have problems such as excessive overpotential and activity decay after multiple cycles due to their slow reaction kinetics in oxygen reduction and oxygen evolution reactions, which hinder their commercializ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90H01M12/06
CPCH01M4/8825H01M4/8828H01M4/9016H01M4/9083H01M12/06
Inventor 王舜俞同文陈忠伟李文艳金辉乐
Owner WENZHOU UNIV
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