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Preparation method and application of CeOx/MC nanosheet material

A technology of nanosheets and raw materials, applied in the direction of fuel cell type half cells and secondary battery type half cells, electrical components, battery electrodes, etc., to achieve the effects of easy large-scale production, high catalytic activity, and renewable raw material sources

Active Publication Date: 2020-05-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high loading in traditional methods usually leads to the agglomeration of nanocrystals, so it is very challenging to obtain ultra-small particle size and high loading at the same time.

Method used

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  • Preparation method and application of CeOx/MC nanosheet material
  • Preparation method and application of CeOx/MC nanosheet material
  • Preparation method and application of CeOx/MC nanosheet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Remove the hard shell from the corn stalks recovered from the farm, break them into small particles, place them in 1.5wt.% sulfuric acid solution at 70°C and stir for 3 hours, wash with deionized water until neutral, and filter the obtained product Dry at 35°C to obtain biomass carbon raw material.

[0043] (2) Weigh cerium acetate and dissolve it in deionized water, and stir to completely dissolve it to obtain a 50 mM solution.

[0044] (3) Place the biomass carbon raw material in step (1) in the solution configured in step (2) for impregnation, ultrasonic treatment for 20 minutes, vacuum treatment for 20 minutes, ultrasonic treatment for 20 minutes again, and filtration, and the product obtained by filtration Fully dry, the drying temperature is 35°C.

[0045] (4) The product dried in step (3) was calcined at 600°C for 4 hours in an argon atmosphere, and the heating rate was 5°C / min to obtain CeO x / MC nanosheet material.

[0046] attached figure 1 The first cur...

Embodiment 2

[0048] (1) Remove the hard shell from the corn stalks recovered from the farm, break them into small particles, place them in 2wt.% hydrochloric acid solution at 85°C and stir for 2 hours, wash with deionized water until neutral, and place the filtered product in Dry at 45°C to obtain biomass carbon raw material.

[0049] (2) Weigh cerium chloride and dissolve it in deionized water, and stir to completely dissolve it to obtain a 30 mM solution.

[0050] (3) Place the biomass carbon raw material in step (1) in the solution configured in step (2) for immersion, ultrasonic treatment for 30 minutes, vacuum treatment for 30 minutes, ultrasonic treatment for 30 minutes again, filter, and filter the obtained product Fully dry, the drying temperature is 45 ℃.

[0051] (4) The product dried in step (3) was calcined in an argon atmosphere at 700°C for 5 hours at a heating rate of 5°C / min to obtain CeO x / MC nanosheet material.

[0052] attached figure 1 The second curve above is the...

Embodiment 3

[0054] (1) Remove the hard shell from the corn stalk recovered from the farm, break it into small particles, place it in a 5wt.% sulfuric acid solution and stir it at 95°C for 1 hour, wash it with deionized water until it is neutral, and place the filtered product Dry at 50°C to obtain biomass carbon raw material.

[0055] (2) Weigh cerium nitrate and dissolve it in deionized water, stir to make it dissolve completely to obtain a 10 mM solution.

[0056] (3) Place the biomass carbon raw material in step (1) in the solution configured in step (2) for immersion, ultrasonic treatment for 45 minutes, vacuum treatment for 45 minutes, and sub-ultrasonic treatment for 45 minutes, and filter. The product was fully dried, and the drying temperature was 60°C.

[0057] (4) The product dried in step (3) was calcined at 800°C for 4 hours in an argon atmosphere, and the heating rate was 10°C / min to obtain CeO x / MC nanosheet material.

[0058] attached figure 1 The third curve above is ...

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Abstract

The invention discloses a preparation method and application of a CeOx / MC nanosheet material, and the preparation method is carried out according to the following steps: (1) removing shells of dry corn straws, crushing into small particles, placing and stirring the small particles in an acid solution, washing with deionized water to be neutral, and carrying out filtering and drying to obtain a biomass carbon raw material; (2) weighting cerium salt and dissolving the cerium salt in deionized water, carrying out stirring to enable the cerium salt to be completely dissolved to obtain a 10-100 mMcerium salt solution; (3) putting the biomass carbon raw material into a cerium solution, carrying out ultrasonic treatment, vacuum treatment and secondary ultrasonic treatment, filtering and drying;and (4) roasting the product dried in the step (3) in an argon atmosphere at 600-900 DEG C to obtain the CeOx / MC nanosheet material. The invention provides an application of the prepared CeOx / MC nanosheet material as a positive electrode catalyst material of a lithium-oxygen battery. According to the invention, large-scale controllable preparation of the CeOx / MC nanosheet is realized, and CeOx hasrich oxygen vacancies, ultra-small grain size and high load capacity, so that the CeOx / MC nanosheet shows excellent lithium-air battery catalytic performance.

Description

technical field [0001] The present invention relates to a CeO x Preparation method of nanocrystalline / biomass carbon-based positive electrode material and application as positive electrode catalyst material for oxygen-reactor battery. Background technique [0002] The rechargeable lithium-oxygen battery has an ultra-high energy density (11.4kWh kg -1 and 6.1kWh L -1 ), which has attracted extensive attention from academia and industry at home and abroad, and some key technologies such as high overpotential, low lifetime, low first effect and unsatisfactory rate performance need to be solved urgently. The chemical composition and structure of catalyst materials seriously affect the transport of oxygen, electrons and lithium ions and the final performance of batteries, so their rational design and precise control are necessary. CeO 2 It has good catalytic performance for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), and can reversibly absorb and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M12/08
CPCH01M4/88H01M4/9016H01M4/9083H01M12/08Y02E60/10
Inventor 王连邦陈思远苏利伟黑金培顾启航吴昊
Owner ZHEJIANG UNIV OF TECH
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