A kind of carbon-coated cobalt and cobalt oxide composite nanomaterial and its preparation method and application

A technology of composite nanomaterials and composite nanostructures, applied in electrolytic components, electrodes, electrolytic processes, etc., can solve the problems of preparing metal cobalt and its oxide nanoparticles, low stability, etc., and achieve excellent electrolytic water hydrogen evolution performance, The effect of good stability and excellent catalytic activity

Active Publication Date: 2019-12-31
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the low stability of electrolytic water hydrogen evolution catalysts working in alkaline environment in the prior art, it is not suitable for long-term use under harsh conditions, and the existing preparation process cannot prepare nitrogen, oxygen, and sulfur through effective strategies. To solve the technical problems of atomically doped carbon-coated cobalt and its oxide nanoparticles, the invention provides a carbon-coated cobalt and cobalt oxide composite nanomaterial and its preparation method and application, which can not only quickly and efficiently Carbon-coated metal cobalt and its oxide nanoparticles doped with nitrogen, oxygen, and sulfur three heterogeneous atoms were prepared, and this electrolytic water hydrogen evolution catalyst working in an alkaline environment has good stability and excellent Catalytic activity, able to meet the long-term use requirements under harsh conditions, and has important application value in the electrolysis of water and hydrogen evolution under alkaline conditions

Method used

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  • A kind of carbon-coated cobalt and cobalt oxide composite nanomaterial and its preparation method and application
  • A kind of carbon-coated cobalt and cobalt oxide composite nanomaterial and its preparation method and application
  • A kind of carbon-coated cobalt and cobalt oxide composite nanomaterial and its preparation method and application

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preparation example Construction

[0028] Specifically, the preparation method of carbon-coated cobalt and cobalt oxide composite nanomaterials provided by the present invention includes:

[0029] Step A. Soak the clean and dry filter paper in the mixed solution of cobalt chloride and thiourea for 3 hours. After the filter paper is saturated with adsorption, take out the filter paper and dry it to obtain the saturated filter paper after drying. . Wherein, the mixed solution of described cobalt chloride and thiourea is made of cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and thiourea (CH 4 N 2 S) made by dissolving in water, and every 2cm 2 The required consumption of cobalt chloride hexahydrate for the filter paper is 0.3~0.6g, the required consumption of thiourea is 0.5~1.5g, and the required consumption of water is 10 milliliters. The drying treatment may include firstly absorbing the liquid on the surface of the filter paper with toilet paper, and then performing drying treatment in an oven at 50°C. In...

Embodiment 1

[0040] A carbon-coated cobalt and an oxide composite nanomaterial of cobalt, the preparation method of which may comprise the following steps:

[0041] Step a. Cut the filter paper into rectangular paper strips of 1cm×2cm, soak in ethanol solution and ultrasonically clean for 30 minutes, take out after repeated cleaning three times, and then dry in an oven at 60°C to obtain clean and dry filter paper.

[0042] Step b, 0.3~0.6g cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and 0.5~1.5g thiourea (CH 4 N 2 S) was dissolved in 10 ml of water to prepare a mixed solution of cobalt chloride and thiourea.

[0043] Step c, soak the clean and dry filter paper described in step a in the mixed solution of cobalt chloride and thiourea described in step b, soak for 3 hours, after the filter paper is saturated with adsorption, take out the filter paper, and use toilet paper The liquid on the surface of the filter paper was blotted dry, and then dried in an oven at 50°C. Thereby obtaining...

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Abstract

The invention discloses a carbon-coated cobalt and cobalt oxide composite nanometer material, a method for preparing the same and application of the carbon-coated cobalt and cobalt oxide composite nanometer material. The carbon-coated cobalt and cobalt oxide composite nanometer material is of a composite nanometer structure of metal cobalt coated by nitrogen, oxygen and sulfur triple-doped carbonand cobalt oxide. The nitrogen, oxygen and sulfur triple-doped carbon is of a porous structure. The method includes soaking filter paper in mixed solution of cobalt chloride and thiourea, and carryingout drying treatment after the filter paper is saturated by means of adsorption so as to obtain dried saturated filter paper; carrying out annealing treatment on filter paper of precursors under theprotection of protective gas under the conditions of the heating rates of 2 DEG C / min and the annealing temperatures of 700-1000 DEG C so as to obtain the carbon-coated cobalt and cobalt oxide composite nanometer material. The carbon-coated cobalt and cobalt oxide composite nanometer material, the method and the application have the advantages that nanometer particles of the metal cobalt coated bythe carbon doped with nitrogen, oxygen and sulfur heteroatoms and the cobalt oxide can be quickly and efficiently prepared by the aid of the method, and the carbon-coated cobalt and cobalt oxide composite nanometer material which is an electrolytic water hydrogen evolution catalyst is good in stability and excellent in catalytic activity when working in alkaline environments, and can be used under rigorous conditions for a long time.

Description

technical field [0001] The invention relates to the technical field of electrolytic water hydrogen evolution, in particular to a carbon-coated cobalt and cobalt oxide composite nanomaterial, a preparation method and application thereof. Background technique [0002] With the increasingly serious energy crisis and environmental problems, people's demand for the development of clean and sustainable energy is increasing. Hydrogen energy has the characteristics of high energy density, environmental friendliness, and regeneration, so hydrogen energy is an ideal substitute for fossil fuels. Among various hydrogen production technologies, electrolysis of water is considered to be the most potential hydrogen production technology, because electrolysis of water for hydrogen evolution can store other green energy (such as solar energy, wind energy) in hydrogen. The electrolytic water hydrogen evolution catalyst is one of the most critical links in the electrolytic water hydrogen evol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/06C25B1/04
CPCC25B1/04C25B11/04Y02E60/36
Inventor 李越张涛孙一强李昕扬柏彧
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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