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Preparation method of difunctional electrocatalyst

An electrocatalyst and dual-function technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of high cost and limited application

Pending Publication Date: 2021-09-14
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high cost and single selectivity of these noble metal-based catalysts limit their application in electrocatalysis

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] A preparation method of a bifunctional electrocatalyst: it is characterized in that the preparation steps are as follows:

[0018] (1) Dissolve methyl orange in ultrapure water to form a clear orange solution, and then FeCl 3 Put into the solution and stir for 30 minutes to produce flocculated precipitate, FeCl 3 The mass ratio to methyl orange is 1:4~1:5;

[0019] (2) Stir with a magnetic stirrer in a water bath at a constant temperature of 25°C, then add pyrrole monomer to stir and seal with a parafilm. After 20-30 hours, the black product is separated, and alternately suction-filtered with hot deionized water and ethanol until the filtrate is colorless Clarify, finally, collect the black powder after drying in a vacuum oven at 60-100°C for 8-12 hours, in which the pyrrole monomer is dissolved in FeCl 3 The mass ratio is 1:1.8-2.2;

[0020] (3) FeCl 3 9H 2 O, CoCl 2 ·6H 2 O and NiCl 2 ·6H 2 O is added to deionized water at a mass ratio of 4-6:1-2:2-3 and stir...

Embodiment 1

[0028] Embodiment one: 0.1964g methyl orange is dissolved in 120mL ultrapure water, forms clear orange solution, then 0.972g FeCl 3 Put it into the solution and stir for 30 minutes to produce flocculation and precipitation. The color of the reaction system changes from clear orange to opaque dark red. Stir with a magnetic stirrer in a water bath at a constant temperature of 25°C, then add 420 μL of pyrrole monomer and stir and seal with a parafilm. After 24 hours The black product was isolated, and was alternately suction-filtered with hot deionized water and ethanol until the filtrate was colorless and clear. Finally, black polypyrrole powder was obtained after drying in a vacuum oven at 80° C. for 10 hours. At room temperature, 173mgFeCl 3 9H 2 O, 38 mg CoCl 2 ·6H 2 O and 76 mg NiCl 2 ·6H 2 O was dissolved in 50 mL of deionized water and stirred at a constant temperature of 50 °C for 1 h. Then 200 mg of black polypyrrole powder was added to the above solution, and ultr...

Embodiment 2

[0030] Example two: 0.1964g methyl orange is dissolved in 120mL ultrapure water to form a clear orange solution, and then 0.972g FeCl 3 Put it into the solution and stir for 30 minutes to produce flocculation and precipitation. The color of the reaction system changes from clear orange to opaque dark red. Stir with a magnetic stirrer in a water bath at a constant temperature of 25°C. Then add 420 μL of pyrrole monomer and stir and seal with a parafilm. After 24 hours The black product was isolated, and was alternately suction-filtered with hot deionized water and ethanol until the filtrate was colorless and clear. Finally, black polypyrrole powder was obtained after drying in a vacuum oven at 80° C. for 10 hours. At room temperature, 140mgFeCl 3 9H 2 O, 62 mg CoCl 2 ·6H 2 O and 62 mg NiCl 2 ·6H 2 O was dissolved in 50 mL of deionized water and stirred at a constant temperature of 50 °C for 1 h. Then 200 mg of polypyrrole powder was added to the above solution, and ultras...

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PUM

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Abstract

The invention provides a preparation method of a difunctional electrocatalyst. The preparation method comprises the following steps: mixing FeCl3.9H2O, CoCl2.6H2O and NiCl2.6H2O with black polypyrrole powder, freeze-drying, and annealing at 800 DEG C to obtain the difunctional electrocatalyst. The catalyst prepared by the method is used in an OER / ORR reaction, has excellent catalytic performance, is simple in preparation process, has low requirements on equipment and process conditions, and is beneficial to popularization and application. The air positive electrode provided by the invention is applied to the zinc-air battery, and has excellent charge-discharge performance and cycling stability.

Description

technical field [0001] The invention relates to a rechargeable zinc-air battery, which is applied in the technical field of electrochemical energy storage devices. Background technique [0002] With the development of science and technology and the improvement of material life, the traditional fossil energy reserves on the earth can no longer meet the needs of the future social development of human beings. The large-scale utilization of fossil energy will bring serious environmental pollution problems and the greenhouse effect. Therefore, the sustainability of energy has rapidly become the focus of modern society. In order to ensure the continuity and sustainability of energy use, energy storage technology is therefore becoming more and more important. At present, batteries commonly used in the field of energy storage include lead-acid batteries, nickel-based batteries, lithium-based batteries, flow batteries, sodium-sulfur batteries, etc., among which lithium-ion batteries...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88H01M4/86
CPCH01M4/8673H01M4/9041H01M4/9083H01M4/88Y02E60/50
Inventor 刘瑞平汤文皞滕柯玮
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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