Preparation and applications of CeOx/RuO2/MC and CeOx/RuO2 composite nanosheet material

A technology of nanosheets and raw materials, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of carbon rationality to be considered, and achieve easy large-scale production and good lithium-oxygen battery catalysis Performance, the effect of high catalytic activity

Active Publication Date: 2020-07-31
ZHEJIANG UNIV OF TECH
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  • Abstract
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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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  • Preparation and applications of CeOx/RuO2/MC and CeOx/RuO2 composite nanosheet material
  • Preparation and applications of CeOx/RuO2/MC and CeOx/RuO2 composite nanosheet material
  • Preparation and applications of CeOx/RuO2/MC and CeOx/RuO2 composite nanosheet material

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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 severe 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 posit...

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 preparation and applications of a CeOx / RuO2 / MC composite nanosheet and a CeOx / RuO2 composite nanosheet material. The preparation method comprises the following steps: (1) removing hard shells from waste corn straws, crushing into small particles, carrying out acid treatment, washing with deionized water to be neutral, filtering, and drying to obtain a biomass carbon raw material; (2) preparing a mixed solution of a cerium salt and a ruthenium salt; (3) putting the biomass carbon raw material into the mixed solution, dipping, sequentially carrying out ultrasonic treatment, vacuum treatment and ultrasonic treatment again in the dipping process, then filtering, and fully drying; (4) roasting the dried product in argon to obtain a CeOx / Ru / MC composite nanosheet; and (5)roasting the CeOx / RuO2 / MC composite nanosheet in air to obtain a CeOx / RuO2 / MC composite nanosheet or a CeOx / RuO2 composite nanosheet material. The invention provides applications of the CeOx / RuO2 / MCcomposite nanosheet material or the CeOx / RuO2 composite nanosheet material as a positive electrode catalyst material of a lithium-oxygen battery, wherein the CeOx / RuO2 / MC composite nanosheet materialor the CeOx / RuO2 composite nanosheet material has relatively high catalytic activity, and the OER reaction overpotential can be greatly reduced.

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 Applications(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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