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a kind of ceo x Preparation method and application of /mc nanosheet material

A technology of nanosheets and raw materials, applied in the direction of fuel cell half-cells and secondary battery-type half-cells, structural parts, electrical components, etc., to achieve the effects of easy scale production, abundant raw material sources, and large load capacity

Active Publication Date: 2021-11-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • a kind of ceo <sub>x</sub> Preparation method and application of /mc nanosheet material
  • a kind of ceo <sub>x</sub> Preparation method and application of /mc nanosheet material
  • a kind of ceo <sub>x</sub> Preparation method and application of /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 immersion, ultrasonic treatment for 20 minutes, vacuum treatment for 20 minutes, ultrasonic treatment for 20 minutes again, filter, and filter the obtained product 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 curve above is the Ce...

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) to immerse, sonicate for 30 minutes, vacuum treat for 30 minutes, sonicate 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 CeO prepared in Example 2 x / ...

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 CeO x The preparation method and application of the MC nanosheet material, the preparation method is carried out according to the following steps: (1) the dry corn stalks are removed from the shell and broken into small particles, placed in an acid solution and stirred, washed with deionized water until neutral, Filtrate and dry to obtain the biomass carbon raw material; (2) Weigh the cerium salt and dissolve it in deionized water, stir to make it dissolve completely to obtain a 10-100mM cerium salt solution; (3) place the biomass carbon raw material in the cerium solution After ultrasonic treatment, vacuum treatment, and secondary ultrasonic treatment, filter and dry; (4) roast the dried product in step (3) at 600-900°C in an argon atmosphere to obtain CeO x / MC nanosheet material. The invention provides prepared CeO x Application of / MC nanosheet materials as cathode catalyst materials for lithium-oxygen batteries. The invention realizes the CeO x Scale-scale and controllable preparation of / MC nanosheets, in which CeO x With abundant oxygen vacancies, ultra-small grain size and high loading capacity, it exhibits excellent catalytic performance for lithium-air batteries.

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 Patents(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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