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Carbon-coated cobalt sulfide material as well as preparing method thereof and application of carbon-coated cobalt sulfide material in aspect of water cracking hydrogen production

A cobalt sulfide and carbon coating technology, applied in chemical instruments and methods, electrolysis components, electrolysis processes, etc., can solve the problems of hydrogen production from water that have not yet been applied electrocatalytic splitting, the reaction system is not environmentally friendly, and the synthesis method is cumbersome. The effect of catalytic stability, cheap synthetic raw materials, and simple synthetic method

Inactive Publication Date: 2015-03-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are some methods for synthesizing such substances. Du et al. prepared Co at a high temperature of 1000 ° C using thiophene as a sulfur source in a hydrogen atmosphere. 9 S 8 Filled carbon nanotubes (J.Phys.Chem.C 2008, Volume 112, page 6); Shi et al. synthesized carbon-coated Co 9 S 8 , the synthesis cost is higher, and the reaction system is not environmentally friendly (ACS Appl.Mater.Interfaces 2012, Volume 4, Page 2999-3006); Peng et al. use carbon disulfide as the sulfur source, and use PVP and ethylenediamine as the surfactant and carbon source , and finally calcined to obtain carbon-coated cobalt disulfide, the synthesis method is relatively cumbersome
So far, these materials have not been applied to the electrocatalytic splitting of water to produce hydrogen

Method used

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  • Carbon-coated cobalt sulfide material as well as preparing method thereof and application of carbon-coated cobalt sulfide material in aspect of water cracking hydrogen production
  • Carbon-coated cobalt sulfide material as well as preparing method thereof and application of carbon-coated cobalt sulfide material in aspect of water cracking hydrogen production
  • Carbon-coated cobalt sulfide material as well as preparing method thereof and application of carbon-coated cobalt sulfide material in aspect of water cracking hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix 123mg cobalt nitrate hexahydrate and 300mg thiocyanuric acid evenly, put the resulting mixture into a quartz tube, and raise it from room temperature to 700°C at a rate of 15°C / min under an inert atmosphere, and keep it at this temperature for 3h , that is, a carbon-coated cobalt sulfide material is obtained.

[0026] Some structural studies were carried out on the materials prepared by the above method. figure 1 It is the XRD spectrum of the obtained carbon-coated cobalt sulfide material. The position of the diffraction peak in the spectrum is consistent with PDF#65-6801 (source: International Diffraction Data Center ICDD), indicating that the substance is Co 9 S 8 Material. figure 2 It is the TEM image of the obtained material, it can be seen that the obtained Co 9 S 8 Distributed in the form of nanoparticles (~40nm) in a 5~8nm thick amorphous carbon layer, thus identifying the material as carbon-coated cobalt sulfide.

[0027] The carbon-coated cobalt sulfi...

Embodiment 2

[0034] The same as in Example 1, except that the calcination temperature was lowered to 600° C., and a carbon-coated cobalt sulfide material was obtained. The electrocatalytic performance of the obtained material:

[0035]Under the condition of pH 0, when the overpotential is 262mV, the current density of the material reaches 10mA / cm 2 ;

[0036] Under the condition of pH 7, when the overpotential is 240mV, the current density of the material reaches 10mA / cm 2 ;

[0037] Under the condition of pH 14, when the overpotential is 260mV, the current density of the material reaches 10mA / cm 2 .

Embodiment 3

[0039] Same as Example 1, except that the calcination temperature was increased to 800° C. to obtain a carbon-coated cobalt sulfide material. The electrocatalytic performance of the obtained material:

[0040] Under the condition of pH 0, when the overpotential is 268mV, the current density of the material reaches 10mA / cm 2 ;

[0041] Under the condition of pH 7, when the overpotential is 245mV, the current density of the material reaches 10mA / cm 2 ;

[0042] Under the condition of pH 14, when the overpotential is 262mV, the current density of the material reaches 10mA / cm 2 .

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Abstract

The invention provides a carbon-coated cobalt sulfide material as well as a preparing method thereof and application of the carbon-coated cobalt sulfide material as a catalyst in the aspect of hydrogen production through the electric catalytic cracking of water and belongs to the fields of catalyst synthesis technologies and application. An organic matter rich in sulfur is used as a sulfur source and a carbon source, a cobalt salt is used as a cobalt source, the organic matter and the cobalt salt are forged in an inert atmosphere after being mechanically mixed uniformly, and the carbon-coated cobalt sulfide material can be obtained. The preparing method is simple and controllable, adopts cheap raw materials, has good sample repeatability, spends short time in the synthesis process, has low requirements on equipment and is suitable for massive production. As an active substance is effectively protected by a carbon coating layer from electrolyte corrosion, the electric conductivity of the material is improved, and accordingly, the material shows excellent hydrogen production electric catalysis performance in acid, neutral as well as alkaline electrolytes. The most important is that the development of the catalyst capable of being used in the whole pH range opens a novel path for the preparation of a cheap, efficient and environment-friendly non-noble metal electric catalysis material for hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of synthesis and application of catalysts, and in particular relates to a carbon-coated cobalt sulfide material, a preparation method and its application as a hydrogen-producing catalyst for electrocatalytic cracking of water. Background technique [0002] With the development of society and economy, environmental pollution is becoming more and more serious, and the global fossil energy is gradually exhausted. For the sustainable development of the world, how to solve the problems of environmental pollution and energy shortage is the most urgent and challenging problem facing all mankind. one of the tasks. In order to solve environmental problems from the root, it is necessary to find alternative green energy sources and reduce people's dependence on non-renewable fossil fuels. Hydrogen is an ideal clean fuel, and its combustion product is only water (H 2 +O 2 →H 2 O), is one of the zero-pollution, zero-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043C25B1/04
CPCY02E60/36
Inventor 李国栋冯亮亮邹晓新吴园园
Owner JILIN UNIV
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