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ceo x /ruo 2 /mc and ceo x /ruo 2 Preparation and Application of Composite Nanosheet Materials

A technology of nanosheets and raw materials, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, can solve the problem of carbon rationality to be considered, and achieve easy large-scale production, simple process, and available sources. effect of regeneration

Active Publication Date: 2021-07-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some research results show that carbon materials are an important part of side reactions in lithium-oxygen batteries, so the rationality of carbon remains to be considered

Method used

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  • ceo  <sub>x</sub> /ruo  <sub>2</sub> /mc and ceo  <sub>x</sub> /ruo  <sub>2</sub> Preparation and Application of Composite Nanosheet Materials
  • ceo  <sub>x</sub> /ruo  <sub>2</sub> /mc and ceo  <sub>x</sub> /ruo  <sub>2</sub> Preparation and Application of Composite Nanosheet Materials
  • ceo  <sub>x</sub> /ruo  <sub>2</sub> /mc and ceo  <sub>x</sub> /ruo  <sub>2</sub> Preparation and Application of Composite Nanosheet Materials

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preparation example Construction

[0044] The preparation method of the nanosheets of the present invention is as follows: by utilizing the functional groups on the surface of corn stalks to adsorb cerium ions and ruthenium ions to realize the thin layer attachment of the two ions on the surface, the ion thin layer is decomposed into small ions during the roasting process. Size Ru and CeO x The nanocrystals are evenly loaded on the surface of mesoporous carbon to avoid serious agglomeration, and finally they are roasted in air to achieve the purpose of oxidizing Ru and removing the carbon substrate, and CeO can be obtained x / RuO 2 / MC nanosheets or CeO x / RuO 2 Nanosheets.

[0045] The assembling and testing method of battery in the example of the present invention are as follows: the CeO x / RuO 2 / MC or CeO x / RuO 2 , PVDF was mixed according to the mass ratio of 9:1, and the solvent NMP was added to stir into a slurry, coated on carbon paper and dried in vacuum at 120°C for 12 hours to obtain the posi...

Embodiment 1

[0047] (1) Remove the hard shell from the corn stalks recovered from the farm, break them into small particles, place them in 0.5wt.% sulfuric acid solution at 70°C and stir for 1 hour, wash with deionized water until neutral, and filter the obtained product Dry at 35°C to obtain biomass carbon raw material.

[0048] (2) Dissolve cerium acetate and ruthenium trichloride in deionized water, stir to dissolve completely to obtain a 5mM solution, and the molar ratio of cerium salt to ruthenium salt is 1:0.02.

[0049] (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.

[0050] (4) The product dried in step (3) was calcined at 600°C for 6 hours in an argon atmosphere, and the heating rate was 2°C / min to obtain CeO ...

Embodiment 2

[0054] (1) Remove the hard shell from the corn stalks recovered from the farm, break them into small particles, place them in 1.5wt.% nitric acid solution at 70°C and stir for 1 hour, wash with deionized water until neutral, and filter the obtained product Dry at 45°C to obtain biomass carbon raw material.

[0055] (2) Dissolve cerium acetate and ruthenium sulfate in deionized water, stir to dissolve completely to obtain a 20mM solution, and the molar ratio of cerium salt to ruthenium salt is 1:0.2.

[0056] (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 60°C.

[0057] (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 / Ru / MC nanosheet mate...

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Abstract

The invention discloses a CeO x / RuO 2 / MC composite nanosheets and CeO x / RuO 2 Preparation and application of composite nanosheet materials. The preparation method is carried out according to the following steps: (1) removing the hard shell of the waste corn stalks and breaking them into small particles, acid treatment, washing with deionized water until neutral, filtering and drying to obtain the biomass carbon raw material; (2) preparing a mixed solution of cerium salt and ruthenium salt; (3) placing the biomass carbon raw material in the mixed solution for impregnation, performing ultrasonic treatment, vacuum treatment, and ultrasonic treatment successively during the impregnation process, and then filtering and fully drying; ( 4) Roast the dried product in argon to obtain CeO x / Ru / MC composite nanosheets; (5) the CeO x / Ru / MC composite nanosheets were calcined in air to obtain CeO x / RuO 2 / MC composite nanosheet or CeO x / RuO 2 Composite nanosheet materials. The present invention provides the CeO x / RuO 2 / MC composite nanosheet material or CeO x / RuO 2 The application of composite nanosheet materials as cathode catalyst materials for lithium-oxygen batteries has high catalytic activity and can greatly reduce the OER reaction overpotential.

Description

technical field [0001] The present invention relates to a CeO x / RuO 2 / MC composite nanosheets and CeO x / RuO 2 The preparation method of the composite nanosheet material and its application as a cathode catalyst material for a lithium-oxygen battery. Background technique [0002] Lithium-ion batteries, as today's main energy storage devices, have become increasingly difficult to meet people's living and production needs. It is urgent to seek a next-generation energy storage system with higher energy density. The theoretical energy density of rechargeable lithium-oxygen batteries is the highest among currently known battery systems, which is more than ten times higher than that of any lithium-ion batteries currently in use. Therefore, it is widely accepted. Research and attention from academics and businesses. The main problems currently hindering the development of lithium-oxygen batteries are their excessively high overpotential, low cycle life, low round-trip effici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/90H01M12/08B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/86H01M4/8652H01M4/9016H01M4/9083H01M12/08H01M2004/8689
Inventor 苏利伟陈思远赵宜哲吴昊王连邦
Owner ZHEJIANG UNIV OF TECH
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