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A preparation method and application of amorphous manganese dioxide modified shrimp shell carbon matrix

A shrimp shell carbon base and manganese dioxide technology, applied in the field of electrocatalytic materials, can solve the problems of complex preparation process, unfriendly environment, long cycle, etc., and achieve the effects of simplifying the preparation process, being environmentally friendly, and increasing porosity

Active Publication Date: 2022-03-04
GUANGDONG OCEAN UNIVERSITY
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Problems solved by technology

[0006] Aiming at the problems of complex preparation process, long cycle and unfriendly environment of the existing manganese dioxide-modified porous carbon materials, the present invention provides a preparation method and application of amorphous manganese dioxide-modified shrimp shell carbon matrix. Amorphous manganese dioxide-modified shrimp shell carbon matrix composite as an efficient oxygen catalyst for secondary zinc-air batteries

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  • A preparation method and application of amorphous manganese dioxide modified shrimp shell carbon matrix
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  • A preparation method and application of amorphous manganese dioxide modified shrimp shell carbon matrix

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preparation example Construction

[0036] One embodiment of the present invention provides a method for preparing amorphous manganese dioxide modified shrimp shell carbon matrix, comprising the following steps:

[0037] Step 1: using EDTA aqueous solution to process the shrimp shell powder;

[0038] Step 2: pyrolyzing the shrimp shell powder treated in Step 1 in an inert atmosphere;

[0039] Step 3: The pyrolysis product is treated with potassium permanganate dilute acid solution, and the pyrolysis product after treatment with potassium permanganate dilute acid solution is dried to obtain amorphous manganese dioxide modified biomass carbon matrix composite material—δ -MnO 2 @BCF.

[0040] In one embodiment, before the first step, the method further includes: washing, drying and crushing the discarded shrimp shells into powder.

[0041] The impurity on the surface of the shrimp shell is removed by cleaning, so as to avoid the influence of the impurity on the performance of the subsequently prepared amorphous ma...

Embodiment 1

[0054] a. Add 3g of pretreated shrimp shell powder to 30mL of EDTA-2Na aqueous solution, the concentration of EDTA-2Na is 2%, the solid-liquid ratio is 1:10, and the solid-liquid separation is carried out after stirring for 0.5h

[0055] b. Dry the filter residue in step a and transfer it to a tube furnace for roasting under a nitrogen atmosphere, and naturally cool to room temperature, wherein the roasting temperature is 600°C, the holding time is 2.0h, and the heating program is 2°C / min;

[0056] c. Soak the pyrolysis product obtained in step b with dilute hydrochloric acid, add 0.15g of potassium permanganate, stir magnetically for 0.5h and let it stand for 20min, then wash it repeatedly with deionized water and ethanol, and dry it overnight at 60°C in a blast drying oven , to obtain a black amorphous manganese dioxide modified biomass carbon-based framework composite material, denoted as δ-MnO 2 @BCF;

[0057] d. Add dilute hydrochloric acid to the EDTA decalcification so...

Embodiment 2

[0059] a. Add 5g of pretreated shrimp shell powder to 75mL of EDTA-2Na aqueous solution, the concentration of EDTA-2Na is 3%, the solid-liquid ratio is 1:15, and the solid-liquid separation is carried out after stirring for 1.0h

[0060] b. Dry the filter residue in step a and transfer it to a tube furnace for roasting under a nitrogen atmosphere, and naturally cool to room temperature, wherein the roasting temperature is 900°C, the holding time is 2.5h, and the heating program is 3°C / min;

[0061] c. Soak the pyrolysis product obtained in step b with dilute nitric acid, add 0.5g potassium permanganate, stir magnetically for 0.5h and let stand for 30min, then wash repeatedly with deionized water and ethanol, and dry overnight at 60°C in a blast drying oven , to obtain a black amorphous manganese dioxide modified biomass carbon-based framework composite material, denoted as δ-MnO 2 @BCF;

[0062] d. Add dilute hydrochloric acid to the EDTA decalcification solution obtained in ...

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Abstract

In order to solve the problems of the existing manganese dioxide-modified porous carbon materials, such as complex preparation process, long cycle and unfriendly environment, the present invention provides an amorphous manganese dioxide-modified shrimp shell carbon matrix (δ-MnO 2 The preparation method of @BCF) is characterized in that it comprises the following steps: step 1: using EDTA aqueous solution to treat the shrimp shell powder; step 2: pyrolyzing the shrimp shell powder treated in step 1 in an inert atmosphere; step 3 : The pyrolysis product is treated with potassium permanganate dilute acid solution, and then the pyrolysis product after treatment with potassium permanganate dilute acid solution is dried to obtain the amorphous manganese dioxide modified biomass carbon matrix composite material. The present invention also provides the application of the amorphous manganese dioxide modified shrimp shell carbon base prepared by the above-mentioned preparation method.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic materials, in particular to a preparation method and application of amorphous manganese dioxide modified shrimp shell carbon base. Background technique [0002] The intensification of energy crisis and environmental pollution has made the development and utilization of clean and sustainable new energy an inevitable choice for current social development. In particular, the rapid development of industries such as electric vehicles, wearable devices, and new grid energy storage has put forward higher energy density requirements for current energy storage devices. Aqueous metal-air batteries represented by secondary zinc-air batteries are considered to be one of the most promising electrochemical energy storage devices due to their low price, high energy density (1084Wh / kg), high safety and environmental friendliness. First, it has become a research hotspot in the field of clean energy. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/96H01M12/06
CPCY02E60/10
Inventor 肖晓罗章奕陈蓓蓓孙东赵辉莫玉剑
Owner GUANGDONG OCEAN UNIVERSITY
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