Oxygen-doped molybdenum disulfide thermoelectric material preparation method

A technology of molybdenum disulfide and thermoelectric materials, which is applied in the manufacture/processing of thermoelectric devices, molybdenum sulfide, etc., can solve the problems of high thermal conductivity and high resistance, and achieve the effects of low thermal conductivity, increased electrical conductivity, and increased ZT value

Inactive Publication Date: 2017-06-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nevertheless, they also pointed out in the article that although the Seebeck coefficient of single-layer molybdenum disulfide is very large, there is still a big challenge as a thermoelectric material, which is too much resistance.
In 2015, Shi Li and Zhang Xiang respectively studied the thermoelectric properties of few-layer molybdenum disulfide, and obtained high power factors in the in-plane direction (>5mW m -1 K -2 ), but because the thermal conductivity in this direction is relatively high (30-50W m -1 K -1 ), the ZT value is only 0.05

Method used

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Embodiment 1

[0040] Oxygen-doped molybdenum disulfide thermoelectric material, the specific preparation method is as follows:

[0041] (1) Take 5g molybdenum disulfide powder and place it in a corundum boat, put it into the quartz tube of the horizontal tube furnace, the diameter of the quartz tube is 50mm, and the length is 1m;

[0042] (2) Purge the quartz tube with argon gas for 2 hours, adjust the flow rate of argon to 76 sccm, increase the heating rate at 5°C / min to 300°C, then switch the gas to air at a flow rate of 100 sccm, keep the temperature for 0.5h, and finally switch the gas to argon Gas, flow rate is 76sccm, began to cool down naturally;

[0043] (3) The powder sample obtained in step (2) is put into a graphite mold with a diameter of 12.7 mm, put into an SPS sintering furnace, pressurized at 50 MPa, and evacuated until the vacuum degree is less than 5 Pa. Then, the current is applied to raise the temperature for sintering, and the temperature rises to about 20 minutes. 130...

Embodiment 2

[0045] Oxygen-doped molybdenum disulfide thermoelectric material, the specific preparation method is as follows:

[0046] (1) Weigh 5g of molybdenum disulfide powder, place it in a corundum boat, and put it into a quartz tube of a horizontal tube furnace.

[0047] (2) Purge the quartz tube with argon gas for 2 hours, adjust the flow rate of argon to 76 sccm, increase the temperature at a rate of 5°C / min to 300°C, then switch the gas to air at a flow rate of 100 sccm, keep the temperature constant for 5 hours, and finally switch the gas to argon , flow rate is 76sccm, begins to cool down naturally.

[0048] (3) The powder sample obtained in step (2) is put into a graphite mold with a diameter of 12.7 mm, put into an SPS sintering furnace, pressurized at 50 MPa, and evacuated until the vacuum degree is less than 5 Pa. Then, the current is applied to raise the temperature for sintering, and the temperature rises to about 20 minutes. 1300°C, keep warm for 2 hours, then release th...

Embodiment 3

[0050] Oxygen-doped molybdenum disulfide thermoelectric material, the specific preparation method is as follows:

[0051] (1) Weigh 5g of molybdenum disulfide powder, place it in a corundum boat, and put it into a quartz tube of a horizontal tube furnace.

[0052] (2) Purge the quartz tube with argon gas for 2 hours, adjust the flow rate of argon to 76 sccm, increase the heating rate at 5°C / min to 300°C, then switch the gas to air at a flow rate of 100 sccm, keep the temperature constant for 10 hours, and finally switch the gas to argon , flow rate is 76sccm, begins to cool down naturally.

[0053] (3) The powder sample obtained in step (2) is put into a graphite mold with a diameter of 12.7 mm, put into an SPS sintering furnace, pressurized at 50 MPa, and evacuated until the vacuum degree is less than 5 Pa. Then, the current is applied to raise the temperature for sintering, and the temperature rises to about 20 minutes. 1300°C, keep warm for 2 hours, then release the pressu...

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Abstract

The invention discloses an oxygen-doped molybdenum disulfide thermoelectric material preparation method. The method comprises the following steps: a certain mass of MoS2 powder is firstly weighed and tiled on a corundum boat and is then put to a quartz tube of a horizontal tube furnace, a certain temperature rises, constant temperature is kept for a certain time in an air atmosphere, oxygen-doped molybdenum disulfide powder is obtained, and finally, a spark plasma sintering (SPS) technology is used for sintering a compact bulk thermoelectric material. The polycrystalline oxygen-doped molybdenum disulfide thermoelectric material obtained by the preparation method of the invention is obvious in preferred orientation, conductance and Seebeck coefficients are high, and the thermoelectric performance is good; besides, the oxygen-doped molybdenum disulfide can be applied to fields such as electrochemistry, photoelectrocatalysis and electronic devices.

Description

technical field [0001] The invention relates to the field of thermoelectric materials, in particular to a preparation method of an oxygen-doped molybdenum disulfide thermoelectric material. Background technique [0002] More than 50% of the energy in today's society is lost in the form of waste heat, and thermoelectric materials can realize mutual conversion between heat energy and electric energy, so the development of thermoelectric materials will help solve the energy crisis. The parameter to evaluate the performance of thermoelectric materials is the thermoelectric figure of merit ZT, ZT=S 2 σT / κ, where S represents Seebeck coefficient, σ represents electrical conductivity, T represents absolute temperature, κ represents thermal conductivity, S 2 σ is called the power factor (Power Factor). The higher the ZT value, the higher the thermoelectric energy conversion efficiency. To increase the ZT value, it is necessary to increase the Seebeck coefficient and electrical co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/34C01G39/06
CPCC01G39/06H10N10/01
Inventor 包信和姜鹏孔爽
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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