Wood-based carbon foam and preparation method thereof, cathode electrocatalyst, cathode and metal-air battery

A carbon foam and wood-based technology, applied in the preparation/purification of carbon, electrical components, battery electrodes, etc., can solve the problems of limited industrial application, complicated preparation process of porous carbon materials, high production cost, etc. Industrial application prospect, effect of reducing preparation cost

Inactive Publication Date: 2021-07-02
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a method for preparing wood-based carbon foam, so as to alleviate the technical problems of existing porous carbon materials that are limited in industrial application due to the complicated preparation process and high production cost

Method used

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  • Wood-based carbon foam and preparation method thereof, cathode electrocatalyst, cathode and metal-air battery
  • Wood-based carbon foam and preparation method thereof, cathode electrocatalyst, cathode and metal-air battery
  • Wood-based carbon foam and preparation method thereof, cathode electrocatalyst, cathode and metal-air battery

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preparation example Construction

[0068] According to a first aspect of the present invention, a preparation method of wood-based carbon foam is provided, comprising the following steps:

[0069] (a) providing delignified wood;

[0070] providing a first solution formed of a transition metal salt, a heteroatom compound and a solvent;

[0071] Wherein, the transition metal salt includes iron salt and cobalt salt, and the heteroatom compound includes nitrogen-containing compound;

[0072] (b) mixing the delignified wood with the first solution, followed by solid-liquid separation to obtain a wood precursor;

[0073] The air in the wood precursor is removed to make the wood precursor porous, then low-temperature solidification and freeze-drying are performed to obtain wood-based foam;

[0074] (c) pyrolyzing the wood-based foam in an inert atmosphere to obtain a wood-based carbon foam.

[0075] Specifically, delignified wood means that the wood does not contain lignin, and "free" means that the amount of ligni...

Embodiment approach

[0083] As an optional embodiment of the present invention, in step (a), the preparation method of delignified wood comprises the following steps:

[0084] provide a solution containing a lignin remover;

[0085] The wood is mixed with a solution containing a lignin remover to cause a reaction, and after the reaction is completed, solid-liquid separation is performed, and the separated solid is placed in an oxidizing solution for treatment to obtain de-lignined wood.

[0086] The wood reacts with the solution containing the lignin remover, and the lignin in the wood can be degraded by the above solution (mainly the lignin remover), thereby realizing the removal of lignin from the wood. After the reaction is completed, in order to prevent lignin from remaining in the wood, the separated solids are placed in an oxidizing solution to further remove residual lignin.

[0087] By limiting the preparation method of delignified wood, the lignin can be more fully removed, the removal o...

Embodiment 1

[0137] The preparation method of the wood-based carbon foam provided by the present embodiment comprises the following steps:

[0138] (a) providing delignified wood;

[0139] 1g of wood (Barr fir) was placed in a 100mL polytetrafluoroethylene reactor, and then 50mL of an aqueous solution containing a lignin removing agent was added, wherein the lignin removing agent included KOH (2.5mol / L) and Na 2 SO 3 (0.4mol / L), the reaction temperature was controlled to be 160°C for 10h, and the solid-liquid separation was carried out after the reaction, and the separated solid was placed in boiling hydrogen peroxide for 2h, and then rinsed in hot deionized water for several times to remove Residual chemicals, resulting in delignified wood;

[0140] providing a first solution of transition metal salt, heteroatom compound and ethanol;

[0141] Wherein, the transition metal salt includes 0.1 g of ferric chloride hexahydrate and 0.107 g of cobalt nitrate hexahydrate, and the heteroatom co...

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Abstract

The invention provides wood-based carbon foam and a preparation method thereof, a cathode electrocatalyst, a cathode and a metal-air battery, and relates to the technical field of batteries. The preparation method comprises the following steps: mixing lignin-removed wood with a first solution, carrying out solid-liquid separation to obtain a wood precursor, then removing air in the wood precursor, carrying out low-temperature curing and freeze drying to obtain wood-based foam, and pyrolyzing the wood-based foam in an inert atmosphere to obtain wood-based carbon foam; wherein the wood subjected to lignin removal has a certain porosity, meanwhile, the original structural property of the wood can be kept, transition metal salt and heteroatom compounds can conveniently enter pore channels of the wood, and subsequent doping of the transition metal salt and the heteroatom compounds is facilitated; furthermore, the graphitization degree of the wood-based carbon foam can be improved by adding the transition metal, so that the electro-catalytic performance of the wood-based carbon foam is improved; and by adding the nitrogen-containing compound, the structure of the wood-based carbon foam is effectively changed, the alkaline site on the surface of the wood-based carbon foam is increased, the hydrophilicity of the wood-based carbon foam is enhanced, and the wood-based carbon foam shows electro-catalytic performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a wood-based carbon foam and a preparation method thereof, a cathode electrocatalyst, a cathode and a metal-air battery. Background technique [0002] In recent years, due to global climate change and the growing demand for energy, the scientific community and industry have gradually turned their attention to the exploration of renewable energy and energy storage devices. As an energy storage device, metal-air batteries are favored because of their high theoretical specific energy, low price, and environmental friendliness. Among them, the cathode electrocatalyst is the core component of the metal-air battery, which directly determines its performance and value. The current commercial cathode catalyst is mainly noble metal platinum. Although its catalytic performance is good, the precious metal reserves are scarce and expensive, which greatly limits the wide application of met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/90H01M4/86H01M12/06
CPCC01B32/05H01M4/9083H01M4/9041H01M4/86H01M12/06H01M2004/8689C01B32/00
Inventor 王猛孙佩佩庞怀鹏张兴双张延青
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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