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Carbon-coated cobalt-tungsten double-metal carbide and preparation method and application thereof

A bimetallic carbide and carbon-coated technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as maintaining stability, and achieve simple synthesis steps, excellent catalytic activity and stability Good reproducibility and sample properties

Inactive Publication Date: 2015-02-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the characteristics of chalcogen compounds, such materials cannot remain stable in strong alkaline electrolytes (such as pH = 14), but it should be pointed out that most electrocatalytic water splitting oxygen generation catalysts can only be used in strong alkaline electrolytes. High activity and stability in the medium, which makes it difficult for them to combine with transition metal chalcogenide catalysts to achieve high-efficiency conversion of electrical energy

Method used

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  • Carbon-coated cobalt-tungsten double-metal carbide and preparation method and application thereof
  • Carbon-coated cobalt-tungsten double-metal carbide and preparation method and application thereof
  • Carbon-coated cobalt-tungsten double-metal carbide and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 52.15mg cobalt nitrate hexahydrate, 47.87mg ammonium tungstate and 200mg dicyandiamide are evenly mixed (in this example, the ratio of the amount of the total metal substance in the two metal compounds to the amount of carbon in the nitrogen-rich organic matter is 1 :13), under inert atmosphere protection conditions, from room temperature to 700 ° C, and keep for 3 hours to obtain carbon-coated cobalt-tungsten double metal carbide.

[0031] Some structural characterizations were performed on the materials prepared by the above method. figure 1 It is the XRD spectrum of the obtained material, and the peak position in the spectrum is consistent with PDF#22-0597, indicating that the substance is a cubic structure of Co 6 W 6 C; figure 2 It is the TEM image of the obtained material, it can be seen that the obtained Co 6 W 6The C cobalt-tungsten double metal carbides are uniformly distributed in the amorphous carbon thin layer in the form of nanoparticles (5-20nm), and ...

Embodiment 2

[0040] Same as Example 1, except that the calcination temperature was lowered to 650°C. Electrocatalytic properties of the obtained samples:

[0041] Under the condition of pH 0, when the overpotential is 210mV, the current density of the material reaches 10mA / cm 2 ;

[0042] Under the condition of pH 14, when the overpotential is 80mV, the current density of the material reaches 10mA / cm 2 ;

[0043] Under the condition of pH 7, when the overpotential is 230mV, the current density of the material reaches 10mA / cm 2 .

Embodiment 3

[0045] Same as Example 1, except that the calcination temperature was increased to 800°C. Electrocatalytic properties of the obtained samples:

[0046] Under the condition of pH 0, when the overpotential is 198mV, the current density of the material reaches 10mA / cm 2 ;

[0047] Under the condition of pH 14, when the overpotential is 75mV, the current density of the material reaches 10mA / cm 2 ;

[0048] Under the condition of pH 7, when the overpotential is 220mV, the current density of the material reaches 10mA / cm 2 .

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Abstract

The invention relates to carbon-coated cobalt-tungsten double-metal carbide, a preparation method thereof and application thereof to hydrogen generation through high-efficiency electro-catalytic cracking of water, belonging to the field of application technology of double-metal carbide synthesis and hydrogen generation through electro-catalytic cracking of water. A mixture of a cobalt-tungsten double-metal compound and nitrogen-rich organic matter is calcined by one step to obtain a target material. The preparation method is simple and controllable, the raw materials are cheap, the sample property repeatability is good, and the method is suitable for large-scale production. The prepared cobalt-tungsten double-metal carbide is uniformly distributed in a thin amorphous carbon layer in nano-particle (5-20nm) form; a carbon coating layer can effectively prevent active substances from erosion caused by electrolyte, and thus the carbon-coated cobalt-tungsten double-metal carbide has excellent stability in electrolytes (including seawater without purification treatment ) under different conditions; more importantly, the catalyst in a total-pH value range can be combined with a catalyst for oxygen generation through electro-catalytic cracking of water, and therefore, the energy utilization rate of converting electrical energy to hydrogen energy is improved really.

Description

technical field [0001] The invention belongs to the technical field of synthesis of bimetallic carbides and application of electrocatalytic cracking of water to produce hydrogen, and in particular relates to a carbon-coated cobalt-tungsten bimetallic carbide, a preparation method and its application in high-efficiency electrocatalytic cracking of water to produce hydrogen. Background technique [0002] Rational development and utilization of energy is a strategic issue related to human survival. New energy sources such as wind energy and solar energy have attracted great attention due to their huge reserves, renewable and clean nature. Converting this type of energy into electrical energy is an excellent way to solve its intermittent nature, and the further conversion of electrical energy into hydrogen energy through electrolysis of water realizes the ideal route from utilization to storage of this type of energy, and at the same time, it is expected to change the human moder...

Claims

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Application Information

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IPC IPC(8): B01J27/22C25B1/04
CPCY02E60/36
Inventor 李国栋刘一蒲邹晓新赵君
Owner JILIN UNIV
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