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Electrocatalyst for methanol fuel cell and preparation method thereof

A methanol fuel cell and electrocatalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor dispersion and uniformity of bimetallic composite materials, inconspicuous catalytic performance of a single transition metal, and difficult distribution of material particles. , to achieve the effect of promoting the interface electrocatalytic reaction, improving the catalytic effect and good catalytic activity

Inactive Publication Date: 2020-11-06
JIANGSU SOPO CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current electrocatalysts for methanol fuel cells have problems such as insignificant catalytic performance of a single transition metal, poor dispersion and uniformity of bimetallic composites, and difficulty in controlling the morphology of multiple metal composites.
As a result, a composite material (such as Co / MnO) of transition metal and metal oxide particles appeared, but the material particles in it are difficult to distribute evenly, which affects its performance as an electrocatalyst.

Method used

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  • Electrocatalyst for methanol fuel cell and preparation method thereof
  • Electrocatalyst for methanol fuel cell and preparation method thereof
  • Electrocatalyst for methanol fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Co-Mn 2 Preparation of O / NCNTs electrocatalyst

[0025] (1) Disperse 0.001mol of manganese acetate and 0.005mol of cobalt nitrate hexahydrate in 50mL of methanol solution, and stir to obtain solution A;

[0026] (2) Add 0.04mol dicyandiamide to solution A, continue to stir and mix to obtain a homogeneous mixture B;

[0027] (3) Transfer the mixture B to an oven for drying at 80°C for 24 hours, and obtain the product C after drying;

[0028] (4) Grind the product C evenly and place it in a tube furnace for calcination. The calcination temperature is 800°C, the heating rate is 2°C / min, and the holding time is 4h. After calcination, Co-Mn 2 O / NCNTs nanomaterials.

[0029] The obtained Co-Mn 2 4 mg of O / NCNTs nanomaterials was added to the mixed solution of ethanol and water (V 乙醇 :V 水 =1:3, a total of 1 ml), and then add 15 microliters of mold solution with a mass fraction of 5%. Sonicate to make it completely dispersed, and take 20 microliters of the comp...

Embodiment 2

[0032] Example 2 Co-Mn 2 Preparation of O / NCNTs electrocatalyst

[0033] (1) Disperse 0.001mol of manganese acetate and 0.005mol of cobalt nitrate hexahydrate in 50mL of methanol solution, and stir to obtain solution A;

[0034] (2) Add 0.04mol dicyandiamide to solution A, continue to stir and mix to obtain a homogeneous mixture B;

[0035] (3) Transfer the mixture B to an oven for drying at 80°C for 48 hours, and obtain the product C after drying;

[0036] (4) Grind the product C evenly and place it in a tube furnace for calcination. The calcination temperature is 750°C, the heating rate is 2°C / min, and the holding time is 4h. After calcination, Co-Mn 2 O / NCNTs nanomaterials.

[0037] Such as image 3 As shown, the Co-Mn prepared in this example 2 O / NCNTs nanomaterials present a tubular structure, Co / Mn 2The O nanoparticle structure is uniformly distributed in the carbon nanotubes, and the diameter of the tubes is about 100 nm. The formation of nanoparticles may be due...

Embodiment 3

[0038] Example 3 Co-Mn 2 Preparation of O / NCNTs electrocatalyst

[0039] (1) Disperse 0.001mol of manganese acetate and 0.005mol of cobalt nitrate hexahydrate in 50mL of methanol solution, and stir to obtain solution A;

[0040] (2) Add 0.04mol dicyandiamide to solution A, continue to stir and mix to obtain a homogeneous mixture B;

[0041] (3) transfer the mixture B to an oven for 24 hours at 90° C., and obtain the product C after drying;

[0042] (4) Grind product C evenly and place it in a tube furnace for calcination. The calcination temperature is 850°C, the heating rate is 2°C / min, and the holding time is 4h. After calcination, Co-Mn 2 O / NCNTs nanomaterials.

[0043] Such as Figure 4 As shown, catalysts have different oxidation effects on methanol catalysts at different scan rates. Utilize cyclic voltammetry to measure the Co-Mn obtained in the present embodiment 2 Electrocatalytic performance of O / NCNTs electrocatalysts towards methanol. With the increase of sca...

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Abstract

The invention discloses an electrocatalyst for a methanol fuel cell and a preparation method thereof. The electrocatalyst is composed of nitrogen-doped carbon nanotubes with the diameter of 100-400 nm, and Co and Mn2O nanoparticles which are uniformly distributed on the inner and outer surfaces of the nitrogen-doped carbon nanotubes and have the particle size of 40-100 nm. The preparation method comprises the following steps: dispersing manganese acetate and cobalt nitrate hexahydrate in a methanol solution, and uniformly stirring to obtain a solution A; adding dicyandiamide into the solutionA, and continuously stirring and mixing to obtain a uniform mixture B; drying the mixture B to obtain a product C; and uniformly grinding the product C, and calcining at 750-850 DEG C for 3-6 hours toobtain the electrocatalyst. The electrocatalyst has a large electrochemical surface area and shows good catalytic activity. After 1000 times of circulation, the material can still maintain 75% of theinitial value, and shows very good stability. The preparation method has the advantages of simple steps, controllable product and low cost.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, and in particular relates to an electrocatalyst for methanol fuel cells and a preparation method thereof. Background technique [0002] In order to balance the increasingly severe energy crisis and human demand for energy, fuel cells and metal-air batteries have been receiving increasing attention due to their environmental protection and sustainability. Therefore, the ultra-durable and low-cost alcohol oxidation catalyst reaction (MOR) has become a decisive factor for the socialization and large-scale commercialization of fuel cells. Fuel cells are considered as an urgent electrochemical energy device that can overcome the problems associated with the combustion of fossil fuels and control the emission of greenhouse gases. In recent decades, catalyst solutes have been widely used as electrocatalysts in anode and cathode fuel cells for the oxygen reduction reaction to generate energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88B82Y30/00
CPCH01M4/9083H01M4/9041H01M4/9016H01M4/8825B82Y30/00Y02E60/50
Inventor 朱桂生章明美邵守言凌晨戴小卉宋子祥黄春霞陈勇
Owner JIANGSU SOPO CHEM
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