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Method for preparing 1T-phase molybdenum disulfide induced by carbon dot doping and application thereof to energy storage material

A technology of molybdenum disulfide and carbon dots, which is applied in the direction of molybdenum sulfide, nano-carbon, hybrid capacitor electrodes, etc., can solve the problems of difficult synthesis of molybdenum disulfide, poor electrochemical performance, and low yield, and achieve excellent electrochemical performance and catalytic performance. Absorbing performance, high specific capacitance, high output effect

Inactive Publication Date: 2019-09-13
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention solves the difficulties of synthesizing 1T metal phase molybdenum disulfide, low yield, high cost, and poor electrochemical performance, and is further applied to the electrode material of supercapacitors to greatly improve the electrochemical performance of molybdenum disulfide

Method used

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  • Method for preparing 1T-phase molybdenum disulfide induced by carbon dot doping and application thereof to energy storage material
  • Method for preparing 1T-phase molybdenum disulfide induced by carbon dot doping and application thereof to energy storage material
  • Method for preparing 1T-phase molybdenum disulfide induced by carbon dot doping and application thereof to energy storage material

Examples

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Embodiment 1

[0028] In this embodiment, molybdenum source and sulfur source are not added, the content of carbon source monohydrate citric acid is 2.48g, and the obtained product is marked as CASO. Dissolve 2.48 g of citric acid monohydrate in 50 mL of deionized water and mix and stir until a uniform solution is obtained to obtain a precursor solution; pour the precursor solution into a polytetrafluoroethylene autoclave, and move the reactor to an oven. React at 220°C for 10 hours; after the reaction, remove the reactor from the oven, filter the brownish-yellow liquid in the reactor three times under reduced pressure, using a water-based filter membrane with a pore size of 0.22 μm. The filtrate was dialyzed using a dialysis bag with a molecular weight cut off of 500, and the water was changed every 10 hours on average, and the dialysis process lasted for 72 hours. Remove the liquid in the dialysis bag, and use a rotary evaporator to remove excess water to obtain a yellow concentrated solut...

Embodiment 2

[0030] This example prepares carbon dots doped 1T molybdenum disulfide according to the following steps:

[0031] 1. Preparation of precursor

[0032] A molybdenum source, a sulfur source, a certain mass of carbon source and water are fully mixed and stirred to a uniform solution in a certain molar ratio to obtain a precursor. Wherein, the molybdenum source adopts ammonium molybdate heptahydrate, the sulfur source adopts thiourea, the molar ratio of the sulfur source and the molybdenum source is 2:1, and the quality is 2.28 and 1.24g respectively; the carbon source adopts citric acid monohydrate, citric acid monohydrate The mass is 0g, and the water uses 50mL of deionized water.

[0033] 2. Preparation of carbon dot doped 1T molybdenum disulfide

[0034] Pour the precursor into a high-pressure reactor and react at 220°C for 10 hours. After the reaction is over, use ethanol and deionized water to filter and wash the dark liquid in the reactor for several times, and finally dr...

Embodiment 3

[0036] In this example, the molar ratio of sulfur source and molybdenum source is 2:1, the masses are 2.28 and 1.24 g respectively, and the carbon source citric acid monohydrate is 2.48 g. Others are the same as in Example 2, and the obtained product is marked as CAS2.

[0037] Concrete preparation parameters in embodiment 1-3 are as follows:

[0038]

[0039] figure 1 Raman diagram of molybdenum disulfide and carbon dots doped 1T molybdenum disulfide hybrid material, sample CAS2 at 147(J 1 ), 196, 219 (J 2 ),280(E 1g ) and 327 (J 3 )cm -1Shows a distinct Raman peak of the 1T crystal form, unlike CAS1 which only shows E 1 2g and A 1g These two typical Raman peaks are typical of 2H MoS2. This indicates that the carbon dots produced by citric acid induce the generation of the 1T phase crystal structure of MoS2. This is because citric acid enters the lamellar structure of molybdenum disulfide, expanding the interlayer spacing of molybdenum disulfide, and the carbon qu...

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Abstract

The invention discloses a method for preparing 1T-phase molybdenum disulfide induced by carbon dot doping and application thereof to an energy storage material. The preparation method comprises the following steps: fully mixing a molybdenum source, a sulfur source, a carbon source and water according to a certain molar ratio and stirring to obtain a uniform solution, namely a precursor solution; transferring the precursor solution into an autoclave, reacting at a high temperature and under high pressure, filtering a reaction solution after the reaction and washing, and drying to obtain the carbon dot-doped 1T molybdenum disulfide powder. The 1T-phase molybdenum disulfide hybrid material prepared in the invention shows good electrochemical performance and catalytic absorbing property, and has broad potential for industrial application.

Description

technical field [0001] The invention relates to the preparation and application of energy storage materials, in particular to a preparation method of carbon point doping induced 1T phase molybdenum disulfide and its application in energy storage materials. Background technique [0002] Molybdenum disulfide (MoS 2 ) belongs to a cheap transition metal with the unique properties of semiconductor materials. Molybdenum disulfide has three crystal structures, which are 2H phase of triangular prism type, 1T phase of octahedral type and 3R phase of rhombohedral structure. In industry, it is usually extracted from molybdenite concentrate, and the common industrial method is to prepare molybdenum disulfide in 2H phase. Due to the close packing of molybdenum disulfide lamellar structure, there are fewer exposed active sites and poor electrochemical properties. , which severely limits the application of molybdenum disulfide. The molybdenum disulfide in the 1T metal phase has loose l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06C01B32/15H01G11/24H01G11/30H01G11/32
CPCC01G39/06C01P2002/72C01P2002/80C01P2002/82C01P2004/03C01P2004/04C01P2006/40C01B32/15H01G11/24H01G11/30H01G11/32Y02E60/13
Inventor 严满清谢非毕红
Owner ANHUI UNIVERSITY
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