Method for preparing nitrogen-doped molybdenum disulfide nanosheets by one-step method

A molybdenum disulfide, nitrogen doping technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of reducing specific surface area, complex process, limiting performance, etc., and achieve simple and fast operation. , low reaction temperature, good catalytic activity

Inactive Publication Date: 2017-07-14
HUAIBEI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The two-step process is complicated, the temperature used for heat treatment is high, the price of ammonia gas is expensive, and the amount of doped nitrogen is not easy to control
[0004] In addition to the above-mentioned patents, noble metal platinum is recognized as the best catalyst, but its high price and low reserves limit its large-scale use
As a typical two-dimensional material, molybdenum disulfide has attracted attention due to its unique structure and low price, and it performs well in

Method used

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  • Method for preparing nitrogen-doped molybdenum disulfide nanosheets by one-step method
  • Method for preparing nitrogen-doped molybdenum disulfide nanosheets by one-step method
  • Method for preparing nitrogen-doped molybdenum disulfide nanosheets by one-step method

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Embodiment 1

[0024] A method for preparing nitrogen-doped molybdenum disulfide nanosheets in one step, comprising the following steps:

[0025] (1) Take by weighing 1.236 grams of ammonium molybdate tetrahydrate, 2.284 grams of thiourea and 0.843 grams of urotropine, and disperse them in 40 milliliters of deionized water, under the action of ultrasonic and magnetic stirring, make it fully Disperse and dissolve.

[0026] (2) Transfer the above-prepared sample to a 50 ml reaction kettle, tighten the reaction kettle, place it in a blast drying oven at 220°C for 24 hours, and cool it down to room temperature naturally after the reaction is over.

[0027] (3) The black precipitate product generated after the reaction was taken out, washed with deionized water and absolute ethanol several times, and the sample was collected by centrifugation to obtain a solid powder.

[0028] (4) Dry the above black solid powder in a vacuum oven at 60°C to constant weight for later use. The morphology and phas...

Embodiment 2

[0035] One-step method for preparing nitrogen-doped molybdenum disulfide nanosheets, the steps are as follows:

[0036] 1. Take a certain amount of ammonium molybdate tetrahydrate, thiourea and urotropine, and disperse them in a container with deionized water, and fully dissolve and disperse them under the action of ultrasonic and magnetic stirring;

[0037] 2. Transfer the solution obtained in step 1 to a polytetrafluoroethylene-lined reaction kettle, place it in a blast drying oven and heat it for a chemical reaction. After a period of reaction, stop heating and allow the reaction kettle to cool naturally to room temperature;

[0038] 3. After cooling to room temperature, centrifuge the reacted solution, collect the synthesized black substance, and wash it several times with a mixed solution of deionized water and absolute ethanol;

[0039] 4. Place the powder obtained after washing in step 3 in a vacuum drying oven and vacuum dry to constant weight.

[0040] The mass rati...

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Abstract

The invention discloses a method for preparing nitrogen-doped molybdenum disulfide nanosheets by a one-step method. The method comprises the following steps: (1) weighing a certain amount of ammonium molybdate tetrahydrate, thiourea and urotropine, dispersing the weighed ammonium molybdate tetrahydrate, thiourea and urotropine in a vessel containing deionized water, and carrying out thorough dissolving and dispersing under the action of ultrasonics and magnetic stirring; (2) transferring the solution obtained in the step (1) into a teflon-lined reaction kettle, carrying out heating in an airblast drying oven for a chemical reaction, stopping heating after a period of time of reaction, and naturally cooling the reaction kettle to room temperature; (3) after cooling the reacted solution to room temperature, centrifuging the reacted solution, collecting a synthesized black substance, and carrying out repeated washing with a mixed solution of deionized water and anhydrous ethanol; (4) subjecting powder, obtained after washing in the step (3), to vacuum drying in a vacuum drying oven until the powder is constant in weight, thereby obtaining the nitrogen-doped molybdenum disulfide nanosheets. According to the method, the cheap urotropine is adopted as a nitrogen source, the reaction temperature is low, the operation is simple, the traditional complicated method is broken through, the yield is high, the catalytic activity is good, and the performance is stable.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped molybdenum disulfide nanosheets in one step, and belongs to the technical field of new energy materials. Background technique [0002] Hydrogen production by electrolysis of water is one of the hot research topics in response to the energy crisis. Inexpensive, efficient and stable catalysts have always been the goal of people's pursuit. Among these catalysts, molybdenum disulfide has always been the key material that people pay attention to because of its low price, novel structure, excellent performance and good stability. There are many reports on related preparation technologies, but molybdenum disulfide also has disadvantages such as poor conductivity and limited catalytic active sites, which limit its use, and the prior art cannot solve this problem well. [0003] For example, application number: 201610021038.6, a nitrogen-doped molybdenum disulfide supported platinum photocatalyst an...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01J27/24
CPCB01J27/051B01J27/24
Inventor 孔祥恺刘强春刘启龙褚晓萌
Owner HUAIBEI NORMAL UNIVERSITY
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