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Carbon-doped transition metal oxide composite material and preparation method and application thereof

A technology of transition metals and composite materials, applied in the field of electrochemistry, can solve the problems of long precursor preparation cycle, large consumption of organic solvent, complicated operation, etc., and achieve the effect of promoting reaction kinetics, strengthening low-temperature oxidation process, and increasing specific surface area

Inactive Publication Date: 2019-01-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the precursor preparation cycle of this method is long, the operation is complicated, and the preparation process consumes a large amount of organic solvent, and the yield is low.

Method used

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  • Carbon-doped transition metal oxide composite material and preparation method and application thereof
  • Carbon-doped transition metal oxide composite material and preparation method and application thereof
  • Carbon-doped transition metal oxide composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Add sodium alginate to deionized water, stir to form a uniform transparent viscous solution, and control the mass percent concentration of sodium alginate to 1.0%;

[0042] 2) The sulfur and nitrogen source is added to the nickel sulfate solution with a mass fraction of 3%, and stirred to form a uniform green solution, wherein the sulfur and nitrogen source is thiourea, and the amount added is 1 / 2 of the quality of sodium alginate, mixed with the nickel sulfate The mass ratio is 1:6;

[0043] 3) adding the sodium alginate solution in step 1) dropwise to the green solution in step 2), stirring and then standing still to form a tubular hydrogel;

[0044] 4) The hydrogel in step 3) is filtered, washed with deionized water, and freeze-dried to obtain a xerogel;

[0045] 5) The xerogel obtained in step 4) is placed in a tube furnace for carbonization treatment under an argon atmosphere, and naturally cooled to room temperature to obtain pyrolysis clinker. Among them, th...

Embodiment 2

[0048] 1) Add sodium alginate to deionized water, stir to form a uniform transparent viscous solution, and control the mass percent concentration of sodium alginate to 0.5%;

[0049] 2) The sulfur and nitrogen source is added into the manganese sulfate solution with a mass fraction of 4%, wherein the sulfur and nitrogen source is stirred to form a uniform gray solution, wherein the sulfur and nitrogen source is thiourea, and the amount of addition is the quality of sodium alginate, and the amount of manganese nitrate The mass ratio is 1:3;

[0050] 3) adding the sodium alginate solution in step 1) dropwise to the gray solution in step 2), stirring and standing to form a tubular hydrogel;

[0051] 4) The hydrogel in step 3) is filtered, washed with deionized water, and freeze-dried to obtain a xerogel;

[0052] 5) The xerogel obtained in step 4) is placed in a tube furnace for carbonization treatment under a nitrogen atmosphere, and naturally cooled to room temperature to obta...

Embodiment 3

[0055] 1) Add sodium alginate to deionized water, stir to form a uniform transparent viscous solution, and control the mass percent concentration of sodium alginate to 1.5%;

[0056] 2) The sulfur and nitrogen source is added to the cobalt chloride solution with a mass fraction of 5%, and stirred to form a uniform pink solution, wherein the sulfur and nitrogen source is potassium thiocyanate, and the amount added is the quality of sodium alginate, mixed with cobalt chloride The mass ratio is 1:5;

[0057] 3) adding the sodium alginate solution in step 1) dropwise to the blood-red solution in step 2), stirring and then standing still to form a tubular hydrogel;

[0058] 4) The hydrogel in step 3) is filtered, washed with deionized water, and freeze-dried to obtain a xerogel;

[0059] 5) The xerogel obtained in step 4) is placed in a tube furnace for carbonization treatment under an inert atmosphere, and naturally cooled to room temperature to obtain pyrolysis clinker. Among t...

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Abstract

The invention provides a carbon-doped transition metal oxide composite material, a preparation method and an application thereof. The preparation method comprises the following steps: adding sodium alginate into deionized water, stirring to obtain transparent viscous liquid; Adding a sulfur and nitrogen source into a transition metal solution and stirring to obtain a homogeneous solution; Adding transparent viscous liquid into homogeneous solution dropwise, stirring, standing, and obtaining tubular gel hydrogel; Filtering, washing and freeze drying the tubular gel hydrogel to obtain a xerogel;Carbonizing the xerogel in an inert atmosphere to obtain pyrolytic clinker; The pyrolysis clinker is heat treated in air atmosphere, then washed and dried to obtain the doped carbon-based transitionmetal oxide composite. The method has the advantages of simple process, easy scalization, good catalytic activity and electrical conductivity, and can be used as a bifunctional catalyst for the positive electrode of the air electrode of the zinc-air battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a doped carbon-based transition metal oxide composite material, a preparation method thereof, and an application in a secondary zinc-air battery catalyst. Background technique [0002] With the rapid development of the economy, the environmental problems caused by the wide application of fossil energy are becoming more and more serious, and the development of clean new energy has become a top priority. Among the many types of energy storage and conversion, electrochemical energy conversion and storage technologies (mainly including metal-air batteries, fuel cells, supercapacitors, etc.) have been recognized as one of the most feasible and effective energy conversion and storage methods. Especially in recent years, rechargeable metal-air batteries have attracted a lot of attention from scholars because of their low cost, environmental friendliness, high energy...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M12/08
CPCH01M4/8825H01M4/9016H01M4/9083H01M12/08Y02E60/10
Inventor 王接喜肖晓李新海颜果春王志兴郭华军胡启阳彭文杰柴作强
Owner CENT SOUTH UNIV
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