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

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...

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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 the application of electrocatalytic hydrogen production. performance

Doping with nitrogen can not only improve its conductivity, but also increase its active sites and improve its performance. Usually, people use ammonia as a nitrogen source and perform doping by high-temperature heat treatment. This method is not only costly but also complicated. , and the high temperature process tends to aggregate and stack nanosheets and reduce their specific surface area, therefore, new methods are needed

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