Preparing method of porous monocrystal IT MoS2 nanosheet and application thereof

A nanosheet, single-layer technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem of not reaching MoS2, and achieve the effect of reducing electron transport resistance, simple and easy method, and large specific surface area.

Active Publication Date: 2017-01-11
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even though CN 103705928 A prepared a single layer of MoS 2 , and the lamellar structure does not form holes, and it does not reach the 1T crystal form of MoS 2

Method used

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  • Preparing method of porous monocrystal IT MoS2 nanosheet and application thereof
  • Preparing method of porous monocrystal IT MoS2 nanosheet and application thereof
  • Preparing method of porous monocrystal IT MoS2 nanosheet and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The porous monolayer 1T MoS of this example 2 The preparation method of nanosheet, the steps are as follows:

[0028] (1) Preparation of MoS in 2H crystal form by hydrothermal method 2 Nanosheets;

[0029] 1) Mix 67.5 mg sodium molybdate and 135.0 mg thiourea (the molar ratio of Mo / S is 1:6.5) and 30 mL deionized water to obtain mixture A;

[0030] 2) Stir the mixture A into a transparent solution, put it in a 40mL hydrothermal reaction kettle, heat it at 220°C for 10 hours, and obtain sample B after precipitation and filtration;

[0031] 3) B was naturally cooled to room temperature, washed with ethanol, and dried at 60 °C for 12 hours to obtain a multilayer 2H crystal form of MoS 2 Nanosheets;

[0032](2) Ultrasonic-assisted Li-ion intercalation method for multilayer 2H crystal MoS 2 The nanosheets are peeled off as follows:

[0033] 2g MoS of 2H crystal form 2 and 10 mL of n-butyllithium n-hexane solution with a concentration of 5 mol / L, and put it into a 50 m...

Embodiment 2

[0035] The porous monolayer 1T MoS of this example 2 The preparation method of nanosheet, the steps are as follows:

[0036] (1) Preparation of MoS in 2H crystal form by hydrothermal method 2 Nanosheets;

[0037] 1) Mix 45.0 mg sodium molybdate and 90.0 mg thiourea (the molar ratio of Mo / S is 1:6.5) and 20 mL deionized water to obtain mixture A;

[0038] 2) Stir the mixture A into a transparent solution, put it in a 40mL hydrothermal reaction kettle, heat it at 180°C for 26 hours, and obtain sample B after precipitation and filtration;

[0039] 3) B was naturally cooled to room temperature, washed with ethanol, and dried at 80 °C for 12 h to obtain multilayer 2H crystal MoS 2 Nanosheets;

[0040] (2) Ultrasonic-assisted Li-ion intercalation method for multilayer 2H crystal MoS 2 The nanosheets are peeled off as follows:

[0041] 2g MoS of 2H crystal form 2 and 10 mL, 10 mol / L n-butyllithium n-hexane solution, put it into a 50 mL Schlenk reaction tube, this process must ...

Embodiment 3

[0043] The porous monolayer 1T MoS of this example 2 The preparation method of nanosheet, the steps are as follows:

[0044] (1) Preparation of MoS in 2H crystal form by hydrothermal method 2 Nanosheets;

[0045] 1) Mix 56.3 mg sodium molybdate and 112.5 mg thiourea (the molar ratio of Mo / S is 1:6.5) and 25 mL deionized water to obtain mixture A;

[0046] 2) Stir mixture A into a transparent solution, put it in a 40mL hydrothermal reaction kettle, heat it at 200°C for 20 hours, and obtain sample B after precipitation and filtration;

[0047] 3) B was naturally cooled to room temperature, washed with ethanol, and dried at 70 °C for 12 hours to obtain a multilayer 2H crystal form of MoS 2 Nanosheets;

[0048] (2) Ultrasonic-assisted Li-ion intercalation method for multilayer 2H crystal MoS 2 The nanosheets are peeled off as follows:

[0049] 2g MoS of 2H crystal form 2 and 10 mL of n-butyllithium n-hexane solution with a concentration of 8mol / L, and put them into a 50mL S...

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Abstract

The invention discloses a preparing method of porous monocrystal IT MoS2 nanosheet. The method comprises the steps of 1, preparing 2H crystal form MoS2 nanosheet using hydrothermal method; 2, conducting stripping of multi-layered 2H crystal form MoS2 nanosheet with ultrasonic wave and assisting with a lithium-ion intercalation method. The 1T MoS2 nanosheet can be directly used for electro-catalysis hydrogen production, and compared with MoS2 with other structures, electro-catalysis hydrogen production property can get fast improvement, porous structure provides more edges for the catalysis, therefore can expose more active sites, which is beneficial to electro-catalysis hydrogen production; single-layered structure enables larger specific surface area of the catalyst, can provide more reaction active sites. Compared with a multi-layered structure, a single-layered structure reduces electric transmission resistance between layer and layer, is beneficial to transmission and transfer of electricity, thus accelerating velocity of electro-catalysis hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a porous single-layer 1T MoS 2 Preparation methods of nanosheets and their application in electrocatalytic hydrogen production. Background technique [0002] In recent years, the energy crisis and environmental pollution caused by the combustion of fossil fuels have attracted widespread attention. This forces people to seek new energy sources that can replace fossil fuels to achieve sustainable development in the future. Hydrogen, as a clean and renewable energy source, has been considered as one of the best candidates. Among them, a common method is the electrocatalytic hydrogen production from water. However, this method has not been widely used because the catalysts used to produce hydrogen are scarce on earth and expensive. Therefore, it is of great theoretical and practical significance for the development and utilization of hydrogen energy to find and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051C01G39/06B82Y30/00B82Y40/00
CPCB01J27/051B01J35/0033B01J35/10B82Y30/00B82Y40/00C01G39/06C01P2002/82C01P2004/04C01P2004/20C01P2004/64
Inventor 李玥王龙禄叶英杰高风仙张倩刘建
Owner HENAN INST OF ENG
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