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Preparation method of low-overpotential cobalt-based composite electrolyzed water oxygen evolution catalyst

An overpotential and water electrolysis technology, which is applied in the field of electrolysis of water for oxygen evolution, can solve the problems of general performance, high energy consumption, and high overpotential of cobalt-based composite oxygen evolution catalyst, and achieves a wide range of materials, low energy consumption and improved catalytic performance. Effect

Inactive Publication Date: 2019-06-28
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cobalt-based composite oxygen evolution catalyst prepared by the existing method has high overpotential, high energy consumption and general performance.

Method used

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  • Preparation method of low-overpotential cobalt-based composite electrolyzed water oxygen evolution catalyst
  • Preparation method of low-overpotential cobalt-based composite electrolyzed water oxygen evolution catalyst
  • Preparation method of low-overpotential cobalt-based composite electrolyzed water oxygen evolution catalyst

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preparation example Construction

[0029] The invention provides a preparation method of a low overpotential cobalt-based composite electrolytic water oxygen evolution catalyst, the steps are as follows:

[0030] (1) Fiber membrane I was prepared by electrospinning process;

[0031] (2) Preparation of precursor II by calcination;

[0032] (3) Calcination to obtain a low overpotential cobalt-based composite electrolytic water oxygen evolution catalyst.

[0033] Electrospinning can effectively control the morphology of cobalt-based MOF, combined with calcination process to prepare oxygen evolution catalyst, the method is simple, the preparation cost is low, and it is expected to obtain a cobalt-based oxygen evolution catalyst with low overpotential, low energy consumption and high performance. The field of electrolysis of water and energy has very important research significance and practical value.

[0034] In order to make the above objects, features and advantages of the present invention more comprehensible...

Embodiment 1

[0046] This implementation case shows a preparation method of a low overpotential cobalt-based composite electrolytic water oxygen evolution catalyst, including:

[0047] Add 0.1 g of polyacrylonitrile to 2.0 g of dimethylformamide solvent, add 0.1 g of ZIF-67 under magnetic stirring, and then stir at room temperature for 24 h. Cut a certain size of clean carbon paper as the base for electrospinning. Take a certain amount of uniformly mixed solution and ultrasonically vibrate for 30 minutes, and put it into a needle tube for electrospinning. Such as figure 2 a SEM image shows that ZIF-67 nanoparticles are uniformly distributed on the polyacrylonitrile fiber. The spun fiber membrane was put into a tube furnace, and calcined at 350°C and 500°C for 30 minutes in a nitrogen or argon atmosphere, respectively, with a heating rate of 5°C / min. Then it was placed in a muffle furnace and calcined at 300° C. for 1 h with a heating rate of 5° C. / min to obtain the target product. The ...

Embodiment 2

[0049] This implementation case shows a preparation method of a low overpotential cobalt-based composite electrolytic water oxygen evolution catalyst, including:

[0050] Add 0.1 g of polyacrylonitrile to 2.0 g of dimethylformamide solvent, add 0.2 g of ZIF-67 under magnetic stirring, and then stir at room temperature for 24 h. Cut a certain size of clean carbon paper as the base for electrospinning. Take a certain amount of uniformly mixed solution and ultrasonically vibrate for 30 minutes, and put it into a needle tube for electrospinning. Such as figure 2b SEM image, ZIF-67 nanoparticles aggregated into porous microspheres on polyacrylonitrile fibers. The spun fiber membrane was put into a tube furnace, and calcined at 350°C and 500°C for 30 minutes in a nitrogen or argon atmosphere, respectively, with a heating rate of 5°C / min. Then it was placed in a muffle furnace and calcined at 300° C. for 1 h with a heating rate of 5° C. / min to obtain the target product.

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Abstract

The invention discloses a preparation method of a low-overpotential cobalt-based composite electrolyzed water oxygen evolution catalyst. The method comprises the following steps: (1) adding a polymerinto a solvent to form a mixed solution, adding a cobalt-based metal organic framework (MOF) to prepare a solution, and preparing a fiber film I from the solution by taking carbon paper as a substratethrough electrostatic spinning; (2) calcining the fiber film I in a nitrogen or argon atmosphere, so as to obtain a precursor II; and (3) calcining the precursor II, so as to obtain the low-overpotential cobalt-based composite electrolyzed water oxygen evolution catalyst. The overpotential of the catalyst is only 260mV when the alternating current density is 10mA / cm<-2>, and the catalyst is an electric catalyst with relatively low overpotential in cobalt-based electric catalysts. Meanwhile, the preparation method of the low-overpotential cobalt-based composite electrolyzed water oxygen evolution catalyst has the beneficial effects that the process is simple, safe and controllable, and the consumed time and energy are little.

Description

technical field [0001] The invention belongs to the technical field of electrolytic water oxygen analysis, and in particular relates to a preparation method of a low overpotential cobalt-based composite electrolytic water oxygen analysis catalyst. Background technique [0002] Cobalt-based metal-organic framework (MOF, ZIF-67) is a porous metal ion compound, and the metal ions and organic ligands contained in it can be directly converted into cobalt with high electrocatalytic activity after calcination reaction in different atmospheres. base composite material. Due to its large specific surface area, good adsorption performance and many catalytic sites, it has been widely used in the research of gas separation, storage and catalysis in recent years. Cobalt-based composite materials have great potential as high-efficiency oxygen evolution catalysts, and compared with noble metals such as yttrium oxide or ruthenium oxide, they are cheap, rich in raw materials, and good in sta...

Claims

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Application Information

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IPC IPC(8): B01J23/75C25B1/04C25B11/06
CPCY02E60/36
Inventor 郭琦赖跃坤赵燕
Owner SUZHOU UNIV
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