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Preparation method of carbon-coated cobalt oxygen evolution reaction electro-catalyst

A technology of oxygen evolution reaction and electrocatalyst, which is applied in the field of electrochemical catalyst preparation, can solve the problems of low catalytic current density, high overpotential and poor stability, and achieve good catalytic performance, simple steps and low cost

Inactive Publication Date: 2014-09-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low catalytic current density, high overpotential and poor stability in existing catalysts, and provide a method for preparing an electrocatalyst for oxygen evolution reaction with carbon-coated cobalt

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  • Preparation method of carbon-coated cobalt oxygen evolution reaction electro-catalyst
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  • Preparation method of carbon-coated cobalt oxygen evolution reaction electro-catalyst

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Embodiment 1

[0034] The carbon-coated cobalt oxygen evolution reaction electrocatalyst is a composite material composed of graphite with good electrical conductivity and cobalt oxide with high catalytic activity.

[0035] The preparation method of a carbon-coated cobalt oxygen evolution reaction catalyst of the present invention, the specific preparation steps are as follows:

[0036] 1) Dissolve 0.29g of cobalt nitrate hexahydrate and 6.006g of urea (molar ratio: 1:100) in deionized water, and ultrasonically disperse to obtain a uniformly mixed solution; the mixed solution is heated in a water bath and evaporated to dryness to obtain a powder;

[0037] 2) After heating and evaporating to dryness in step 1), the powder was obtained, heated to 900°C under the protection of argon, and kept at a constant temperature for 1 hour, and the carbon-coated cobalt elemental black powder was obtained after natural cooling;

[0038] 3) The black powder obtained in 2) is dissolved in a mixed solution of...

Embodiment 2

[0049] The carbon-coated cobalt oxygen evolution reaction electrocatalyst is a composite material composed of graphite with good electrical conductivity and cobalt oxide with high catalytic activity.

[0050] A kind of preparation method of carbon-cobalt oxygen evolution reaction catalyst of the present invention, concrete preparation steps are as follows:

[0051] 1) Dissolve 0.29g of cobalt nitrate hexahydrate and 15.015g of urea (molar ratio: 1:250) in deionized water, and ultrasonically disperse to obtain a uniformly mixed solution; heat the mixed solution in a water bath and evaporate to dryness;

[0052] 2) Heat the powder obtained after heating and evaporating to dryness in step 1) to 900°C under the protection of argon, and keep it at a constant temperature for 1 hour, and obtain carbon-cobalt black powder after natural cooling;

[0053] 3) The black powder obtained in 2) is dissolved in a mixed solution of ethanol and naphthol; the mixing volume ratio of ethanol and n...

Embodiment 3

[0057] The carbon-coated cobalt oxygen evolution reaction electrocatalyst is a composite material composed of graphite with good electrical conductivity and cobalt oxide with high catalytic activity.

[0058] A kind of preparation method of carbon-cobalt oxygen evolution reaction catalyst of the present invention, concrete preparation steps are as follows:

[0059] 1) Dissolve 0.29g of cobalt nitrate hexahydrate and 30.03g of urea (molar ratio (1:500)) in deionized water, and ultrasonically disperse to obtain a uniformly mixed solution; heat the mixed solution in a water bath and evaporate to dryness;

[0060] 2) Heat the powder obtained after heating and evaporating to dryness in step 1) to 900°C under the protection of argon, and keep it at a constant temperature for 1 hour, and obtain carbon-cobalt black powder after natural cooling;

[0061] 3) The black powder obtained in 2) is dissolved in a mixed solution of ethanol and naphthol; the mixing volume ratio of ethanol and n...

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Abstract

The invention relates to a preparation method of a carbon-coated cobalt oxygen evolution reaction electro-catalyst and belongs to the preparation field of electrochemical catalysts. The preparation method includes the steps that firstly, a carbon source and cobalt salts in proportion are placed into water for dissolving and mixing, and then evaporation to dryness is performed at the water bath condition at the temperature of 50 DEG C-80 DEG C to obtain powder evenly mixed; then the powder is heated to 400 DEG C-1000 DEG C under the shielding gas condition and then calcinated for 30 minutes-120 minutes to obtain a carbon-coated cobalt elementary substance; finally, an electrochemical pretreatment method is used for obtaining a nano-particle of carbon layer-cobaltic oxide-elementary substance cobalt, wherein the nano-particle is of an electric conduction core-shell structure. The method is simple in process, convenient to implement and low in requirement for preparation equipment and improves safety in the experiment process. The carbon layer-cobaltic oxide-elementary substance cobalt prepared through the method is even in diameter and good in electric conduction and has good electro-catalysis water oxidation performance.

Description

technical field [0001] The invention relates to a preparation method of an oxygen evolution reaction electrocatalyst coated with cobalt by carbon, and belongs to the field of preparation of electrochemical catalysts. Background technique [0002] The electrolysis of water to generate hydrogen and oxygen offers a possible way to store intermittent energy sources such as solar energy and wind energy. However, due to the slow kinetic process of the oxygen evolution reaction, the voltage required for water electrolysis is much higher than the thermodynamic potential for water splitting. The most active oxygen evolution reaction catalyst is RuO 2 and IrO 2 , but these precious metals are very scarce and cannot be used on a large scale. Therefore, it is of great importance to develop non-noble metal electrocatalysts for oxygen evolution reaction with high catalytic activity. [0003] In recent years, transition metal oxides, especially cobalt oxides, have attracted extensive a...

Claims

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Application Information

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IPC IPC(8): B01J23/75H01M4/88B82Y30/00
CPCY02E60/50
Inventor 严乙铭肖青青杨志宇张玉霞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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