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Preparation method and application of MoS2/rGO-CN composite material

A composite material, rgo-cn technology, applied in the field of electrocatalytic hydrogen evolution, can solve the problems of poor conductivity and easy accumulation of molybdenum disulfide

Active Publication Date: 2018-02-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings of easy accumulation of molybdenum disulfide and poor conductivity, and improve its electrocatalytic hydrogen evolution activity, the purpose of the present invention is to disclose a preparation method of molybdenum disulfide / reduced graphene oxide-nitrogen carbide composite hydrogen evolution electrocatalytic material

Method used

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  • Preparation method and application of MoS2/rGO-CN composite material
  • Preparation method and application of MoS2/rGO-CN composite material
  • Preparation method and application of MoS2/rGO-CN composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Weigh 45 mg of graphite oxide and place it in a beaker, add 15 mL of deionized water, ultrasonically disperse and then add 27 mg of melamine to ultrasonically dissolve again to form a colloidal solution. The above colloidal solution was transferred to a 25 mL polytetrafluoroethylene-lined reactor, and then the reactor was placed in an oven at 120 °C for 6 h, cooled to room temperature, and finally freeze-dried to obtain a black substance. Then transfer the obtained black substance into a porcelain boat, and then transfer it to a temperature-programmed tube furnace. Under the protection of argon, the temperature-programmed tube furnace is heated to 600 °C at a heating rate of 2.3 °C / min and then kept for 2 hours. After being naturally cooled to room temperature, it was taken out to obtain reduced graphene oxide-nitrogen carbide (rGO-CN).

[0030] Weigh 1 mg ammonium tetrathiomolybdate ((NH 4 ) 2 MoS 4 ) and 2 mg rGO-CN were placed in a beaker, then 15 mL DMF was added...

Embodiment 2

[0032] Weigh 45 mg of graphite oxide and place it in a beaker, add 15 mL of deionized water, ultrasonically disperse and then add 27 mg of melamine to ultrasonically dissolve again to form a colloidal solution. The above colloidal solution was transferred to a 25 mL polytetrafluoroethylene-lined reactor, and then the reactor was placed in an oven at 120 °C for 6 h, cooled to room temperature, and finally freeze-dried to obtain a black substance. Then transfer the obtained black substance into a porcelain boat, and then transfer it to a temperature-programmed tube furnace. Under the protection of argon, the temperature-programmed tube furnace is heated to 600 °C at a heating rate of 2.3 °C / min and then kept for 2 hours. After being naturally cooled to room temperature, it was taken out to obtain reduced graphene oxide-nitrogen carbide (rGO-CN).

[0033] Weigh 3 mg ammonium tetrathiomolybdate ((NH 4 ) 2 MoS 4 ) and 2 mg rGO-CN were placed in a beaker, then 15 mL DMF was added...

Embodiment 3

[0035] Weigh 45 mg of graphite oxide and place it in a beaker, add 15 mL of deionized water, ultrasonically disperse and then add 27 mg of melamine to ultrasonically dissolve again to form a colloidal solution. The above colloidal solution was transferred to a 25 mL polytetrafluoroethylene-lined reactor, and then the reactor was placed in an oven at 120 °C for 6 h, cooled to room temperature, and finally freeze-dried to obtain a black substance. Then transfer the obtained black substance into a porcelain boat, and then transfer it to a temperature-programmed tube furnace. Under the protection of argon, the temperature-programmed tube furnace is heated to 600 °C at a heating rate of 2.3 °C / min and then kept for 2 hours. After being naturally cooled to room temperature, it was taken out to obtain reduced graphene oxide-nitrogen carbide (rGO-CN).

[0036] Weigh 7 mg ammonium tetrathiomolybdate ((NH 4 ) 2 MoS 4 ) and 2 mg rGO-CN were placed in a beaker, then 15 mL DMF was added...

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Abstract

The invention belongs to the technical field of electrocatalytic hydrogen evolution, and relates to a preparation method and application of a molybdenum disulfide / reduced graphene oxide-nitrogen carbide (MoS2 / rGO-CN) composite material. The preparation method comprises the steps of: firstly adding graphite oxide into deionized water, adding melamine into the obtained mixture, then performing ultrasound dissolution so as to form a colloidal solution, adopting a hydrothermal method to prepare aerogel of reduced graphene oxide-nitrogen carbide, and then performing a solvothermal reaction to obtain the target product by adopting ammonium tetrathiomolybdate as a molybdenum source and a sulfur source and N,N-dimethylformamide as a solvent. The preparation method of the aerogel of the reduced graphene oxide-nitrogen carbide is simple and high in yield, and since the MoS2 / rGO-CN is prepared by using the one-step solvothermal method, the preparation method has low cost and high repeatability and facilitates large-scale synthesis; by means of the prepared MoS2 / rGO-CN composite material, the accumulation of the molybdenum disulfide is reduced, and the quantity of active sites is increased; the conductivity and the active area of the MoS2 can be improved through the combination of the MoS2 with the rGO-CN, and when the prepared MoS2 / rGO-CN composite material is applied to an electrocatalytic hydrogen evolution reaction, excellent catalytic performance can be exhibited, and when the current density is 10 mA.cm<-2>, the overpotential is 203 mV, and the Tafel slope is 48 mV.dec<-1>.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic hydrogen evolution, and relates to a preparation method of a hydrogen evolution electrocatalytic material, in particular to a molybdenum disulfide / reduced graphene oxide-nitrogen carbide (MoS 2 / rGO-CN) composites and their applications. Background technique [0002] With the development of the economy and the intensification of the global energy crisis, non-renewable fossil energy is still the main way of energy consumption, and it also causes environmental pollution. People are committed to finding new green and sustainable energy. Among them, hydrogen, as an energy source, has a wide range of sources and the combustion product is water without other pollutants, which has attracted more and more attention. In the production of hydrogen, electrolysis of water to produce hydrogen is an efficient, convenient and promising method for hydrogen production. However, efficient electrocatalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/24B01J35/33Y02E60/36
Inventor 施伟东余芙荣张正媛
Owner JIANGSU UNIV
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