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Preparation method of oxygen-doped molybdenum disulfide nanosheet hydrogen evolution electrocatalyst rich in defects

A molybdenum disulfide, electrocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, electrodes, etc., can solve the problems of limited base electrocatalyst application ability, loss of electrical conductivity, hydrogen evolution performance gap, etc., to achieve high efficiency and stability The effect of hydrogen evolution performance, high repetition rate and low cost

Pending Publication Date: 2022-04-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, some researchers [Xie, J.; Adv. Mater.2013, 25, 5807-5813] showed that in MoS 2 The structural defects on the surface of nanosheets can expose more unsaturated sulfur active sites, but the electrical conductivity is seriously lost
However, there is a contradictory trade-off relationship between the abundance of active sites and the conductivity of the construction defects. At the same time, compared with noble metals, MoS 2 There is still a certain gap in the hydrogen evolution performance of MoS, which limits the 2 The application ability of the base electrocatalyst in the hydrogen evolution industry

Method used

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  • Preparation method of oxygen-doped molybdenum disulfide nanosheet hydrogen evolution electrocatalyst rich in defects
  • Preparation method of oxygen-doped molybdenum disulfide nanosheet hydrogen evolution electrocatalyst rich in defects
  • Preparation method of oxygen-doped molybdenum disulfide nanosheet hydrogen evolution electrocatalyst rich in defects

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A defect-rich O-MoS 2 / CC preparation method of hydrogen evolution electrocatalyst. Its preparation method is as follows:

[0045] (1) Pretreatment of carbon cloth. First, soak the carbon arrangement in concentrated nitric acid for 30 minutes, then place it in water heating at 120°C for 30 minutes, and cool it to room temperature with the furnace, ready to use.

[0046] (2) Take out the carbon cloth treated in step (1), wash it with absolute ethanol and deionized water for 3 to 5 times, and then place it in an oven at 60°C to dry for later use.

[0047] (3) Take thiourea with an electronic balance, and dissolve it in 40 mL of deionized water with ammonium molybdate, control the (S / Mo) molar ratio of thiourea and ammonium molybdate to be 5.0, and the concentration of thiourea to be 0.04mol / L at room temperature Under magnetic stirring for 25min.

[0048] (4) Transfer the carbon cloth obtained in step (2) and the solution obtained in step (3) to a 50mL reaction kettle...

Embodiment 2

[0060] A defect-rich O-MoS 2 / CC preparation method of hydrogen evolution electrocatalyst. Its preparation method is as follows:

[0061] (1) Pretreatment of carbon cloth. First, soak the carbon arrangement in concentrated nitric acid for 30 minutes, then place it in water heating at 120°C for 30 minutes, and cool it to room temperature with the furnace, ready to use.

[0062] (2) Take out the carbon cloth treated in step (1), wash it with absolute ethanol and deionized water for 3 to 5 times, and then place it in an oven at 60°C to dry for later use.

[0063] (3) Take thiourea with an electronic balance, and dissolve it in 40 mL of deionized water with ammonium molybdate, control the (S / Mo) molar ratio of thiourea and ammonium molybdate to be 5.0, and the concentration of thiourea to be 0.04mol / L at room temperature Under magnetic stirring for 25min.

[0064] (4) Transfer the carbon cloth obtained in step (2) and the solution obtained in step (3) to a 50mL reaction kettle...

Embodiment 3

[0071] A defect-rich O-MoS 2 / CC preparation method of hydrogen evolution electrocatalyst. Its preparation method is as follows:

[0072] (1) Pretreatment of carbon cloth. First, soak the carbon arrangement in concentrated nitric acid for 50 minutes, then place it in water heating at 120°C for 30 minutes, and cool it to room temperature with the furnace, ready to use.

[0073] (2) Take out the carbon cloth treated in step (1), wash it with absolute ethanol and deionized water for 3 to 5 times, and then place it in an oven at 60°C to dry for later use.

[0074] (3) Take thiourea with an electronic balance, and dissolve it in 40 mL of deionized water with ammonium molybdate, control the (S / Mo) molar ratio of thiourea and ammonium molybdate to be 3.0, and the concentration of thiourea is 0.04mol / L at room temperature Under magnetic stirring for 25min.

[0075] (4) Transfer the carbon cloth obtained in step (2) and the solution obtained in step (3) to a 50mL reaction kettle. U...

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Abstract

The invention discloses a preparation method of an oxygen-doped molybdenum disulfide nanosheet hydrogen evolution electrocatalyst rich in defects. Belongs to the technical field of energy and catalysis. According to the invention, ammonium molybdate tetrahydrate and thiourea are used as precursors, and an oxygen-doped molybdenum disulfide nanosheet array is synthesized on carbon cloth through a one-step hydrothermal reaction. And then etching is carried out through a wet chemical corrosion technology, and finally the high-performance hydrogen evolution electrocatalyst rich in defects is obtained. The preparation process is simple and controllable, and the catalyst is excellent in hydrogen evolution performance, low in cost and easy to popularize and apply.

Description

technical field [0001] The invention discloses a preparation method of a defect-rich oxygen-doped molybdenum disulfide nanosheet hydrogen evolution electrocatalyst, which belongs to the technical field of energy and catalysis. Background technique [0002] The gradual consumption of fossil fuels and a series of environmental and energy problems caused by them have prompted scientists to develop new clean and non-polluting sustainable energy sources. A possible energy crisis offers a solution. Therefore, it is particularly important to study the preparation of hydrogen. Among them, the water electrolysis hydrogen production technology has the advantages of simplicity, environmental protection, high efficiency and high purity hydrogen production, and has attracted people's attention. However, due to cost reasons, it is difficult to apply this technology on a large scale. Among them, the catalyst with platinum as the main active substance is the best catalyst for electrolysi...

Claims

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Application Information

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IPC IPC(8): B01J27/051C25B11/091C25B1/04
Inventor 李小云连天杨晓宇王一龙陈丽华苏宝连
Owner WUHAN UNIV OF TECH
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