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Preparation method of nano-grade electro-catalyst based on graphene

An electrocatalyst, graphene technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of easy agglomeration, difficult particle size control, etc. Not easy to agglomerate, improve catalytic reduction ability, and controllable pore size

Inactive Publication Date: 2013-07-24
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a graphene-based nano-electrocatalyst, which solves the defects of the existing carbon carrier, such as difficult control of particle size and easy agglomeration, when loading Pt-based catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0014] Add 0.3g of nano-zinc oxide with a particle size of 800nm ​​to 50mL of ethanol solution with a concentration of 1mg / mL graphene oxide, ultrasonically oscillate to form a uniform suspension, and then add 1mL of 0.005M chloroplatinic acid and 1mL of 0.01M cobalt acetate dropwise Mix the solution and stir for 30 minutes to form a uniform dispersion; then place it in a microwave oven and heat for 10 minutes by heating for 5 seconds and intermittently for 30 seconds. After the reaction is completed, cool to room temperature, remove the template with 10 mL of 0.1 M hydrochloric acid, and filter with suction. Washed three times with absolute ethanol and deionized water, respectively, and dried in vacuum to constant weight to obtain graphene-based nano-electrocatalysts.

Embodiment approach 2

[0016] Add 0.5g of nano-zinc oxide with a particle size of 2μm to 50mL of ethylene glycol solution with a concentration of 1mg / mL graphene oxide, ultrasonically vibrate to form a uniform suspension, and then add 1mL of 0.01M chloroplatinic acid and 2mL of 0.02M Stir the mixed solution of nickel chloride for 30 minutes to form a uniform dispersion; then place it in a microwave oven and heat for 10 minutes by heating for 30 seconds and intermittently for 80 seconds. Suction filtration, washing with absolute ethanol and deionized water three times respectively, and vacuum drying to constant weight to obtain a graphene-based nano-electrocatalyst.

Embodiment approach 3

[0018] Add 0.1g of nano-calcium carbonate with a particle size of 200nm to 50mL of graphene oxide glycerol solution with a concentration of 1mg / mL, ultrasonically vibrate to form a uniform suspension, and then add 1mL of 0.004M chloroplatinic acid and 2mL of 0.01M Mix solution of cobalt nitrate and 2mL 0.01M, stir for 30min until a uniform dispersion is formed; then place it in a microwave oven, heat for 10min by heating for 10s and intermittently for 60s, after the reaction is completed, cool to room temperature, and remove with 10mL of 0.1M sulfuric acid The template agent was suction-filtered, washed three times with absolute ethanol and deionized water, and vacuum-dried to constant weight to obtain a graphene-based nano-electrocatalyst.

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Abstract

The invention relates to a preparation method of a nano-grade electro-catalyst based on graphene. According to the method, a templating agent is added into an alcohol solution of graphene oxide; ultrasonic processing is carried out, and the mixture is uniformly stirred and oscillated; a mixed solution of chloroplatinic acid and a transition metal salt is dropped in; the mixture is well mixed and is subjected to an intermittent heating reaction in a microwave oven; the mixture is cooled, and the templating agent is removed by using dilute hydrochloric acid; and pump-filtration and vacuum bake-drying are carried out, such that the nano-grade electro-catalyst with graphene as a carrier is obtained. The catalyst provided by the invention has the advantages of small particles, agglomeration prevention, uniform distribution, simple preparation steps, and short preparation process. The catalyst provided by the invention can be used in alcohol fuel batteries and lithium-air batteries.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a graphene-based nanometer electrocatalyst. Background technique [0002] Currently, the commonly used catalysts for lithium-air batteries are carbon-supported Pt-based. Although Pt / C catalysts have good catalytic performance for oxygen reduction, their oxygen evolution performance is low, resulting in a decrease in battery efficiency. In recent years, although major breakthroughs have been made in the research of non-platinum catalysts, such as carbon-supported Pd-Co alloy catalysts, the catalytic activity is significantly improved compared with other non-platinum catalysts, but the activity is still lower compared with Pt-based catalysts. Therefore, in the research of Pt-based catalysts, the focus is to improve the dispersion of Pt on the carrier, and reduce the loading of Pt on the premise of improving or ensuring the activity. It is extremely challe...

Claims

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Application Information

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IPC IPC(8): B01J23/89H01M4/90
CPCY02E60/50
Inventor 银凤翔王亮陈标华
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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