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Preparation method and application of nano-porous nickel-molybdenum disulfide/graphene composite material

A technology of nanoporous nickel and composite materials, which is applied in the preparation and application field of nanoporous nickel-molybdenum disulfide/graphene composite materials, can solve the problems of insufficient improvement range, reduce charge transfer resistance, increase catalyst active sites, The effect of good conductivity

Active Publication Date: 2018-08-24
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method is very effective for improving the catalytic performance of molybdenum disulfide, but the improvement rate is not enough

Method used

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  • Preparation method and application of nano-porous nickel-molybdenum disulfide/graphene composite material
  • Preparation method and application of nano-porous nickel-molybdenum disulfide/graphene composite material
  • Preparation method and application of nano-porous nickel-molybdenum disulfide/graphene composite material

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Experimental program
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Embodiment 1

[0041] The preparation process and steps in this embodiment are as follows:

[0042] (1) Synthetic graphite oxide according to the improved Hummers method;

[0043] (2) Synthesis of MoS by hydrothermal method 2 / RGO composite material, 2.4g Na 2 S·9H 2 O and 0.72 g MoO 3 Dissolve in 20ml of deionized water, then add 2.4ml of graphite oxide, transfer to a stainless steel reaction kettle after ultrasonication for 15min, and put the sealed reaction kettle in an electronic oven at 200°C for 60min to keep warm. Obtained MoS 2 / RGO composites were washed 4 times with deionized water and 2 times with ethanol, and the obtained black precipitate was kept in a vacuum oven at 60°C for 12 hours, and then the product was collected;

[0044] (3) Preparation of Ni(OH) by hydrothermal method 2 powder, 1.45g Ni(NO 3 ) 2 Dissolve 1.4g of hexamethylenetetramine HMT in 35ml of ultrapure water, stir evenly with a magnetic stirrer, and then transfer it to a stainless steel reaction kettle. ...

Embodiment 2

[0054] (1) Synthetic graphite oxide according to the improved Hummers method;

[0055] (2) Synthesis of MoS by hydrothermal method 2 / RGO composite material, 2.4g Na 2 S·9H 2 O and 0.72 g MoO 3 Dissolve in 20ml of deionized water, then add 1.2ml of graphite oxide, transfer to a stainless steel reaction kettle after ultrasonication for 15min, and put the sealed reaction kettle in an electronic oven at 200°C for 60min to keep warm. Obtained MoS 2 / RGO composites were washed 4 times with deionized water and 2 times with ethanol, and the obtained black precipitate was kept in a vacuum oven at 60°C for 12 hours, and then the product was collected;

[0056] (3) Preparation of Ni(OH) by hydrothermal method 2 powder, 1.45g Ni(NO 3 ) 2 Dissolve 1.4g of hexamethylenetetramine HMT in 35ml of ultrapure water, stir evenly with a magnetic stirrer, and then transfer it to a stainless steel reaction kettle. Product Ni(OH) 2 collected by centrifugation;

[0057] (4) the prepared Ni(O...

Embodiment 3

[0061] (1) Synthetic graphite oxide according to the improved Hummers method;

[0062] (2) Synthesis of MoS by hydrothermal method 2 / RGO composite material, 2.4g Na 2 S·9H 2 O and 0.72 g MoO 3 Dissolve in 20ml of deionized water, then add 6ml of graphite oxide, transfer to a stainless steel reaction kettle after ultrasonication for 15min, and put the sealed reaction kettle in an electronic oven at 200°C for 60min to keep warm. Obtained MoS 2 / RGO composites were washed 4 times with deionized water and 2 times with ethanol, and the obtained black precipitate was kept in a vacuum oven at 60°C for 12 hours, and then the product was collected;

[0063] (3) Preparation of Ni(OH) by hydrothermal method 2 powder, 1.45g Ni(NO 3 ) 2 Dissolve 1.4g of hexamethylenetetramine HMT in 35ml of ultrapure water, stir evenly with a magnetic stirrer, and then transfer it to a stainless steel reaction kettle. Product Ni(OH) 2 collected by centrifugation;

[0064] (4) The prepared MoS 2...

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Abstract

The invention relates to a preparation method and application of a nano-porous nickel-molybdenum disulfide / graphene composite material. The preparation method comprises the following steps: mixing molybdenum disulfide / graphene (MoS2 / RGO) with nickel hydroxide [Ni(OH)2], wherein the molybdenum disulfide / graphene (MoS2 / RGO) and the nickel hydroxide [Ni(OH)2] are separately prepared by a hydrothermalmethod; and then carrying out annealing treatment so as to be capable of preparing the nano-porous nickel-molybdenum disulfide / graphene (NPNi-MoS2 / RGO) composite material. The specific method comprises the following steps: a, preparing graphite oxide according to an improved Hummers method; b, preparing MoS2 / RGO by the hydrothermal method; c, preparing Ni(OH)2 powder by the hydrothermal method; d, mixing Ni(OH)2 with MoS2 / RGO uniformly and then placing the mixture in a tubular furnace, annealing in an Ar / H2 atmosphere to reduce Ni(OH)2 into NPNi so as to obtain the NPNi-MoS2 / RGO composite material. The composite material is used as a catalyst of hydrogen evolution reaction (HER), and has excellent catalytic performance, and the onset potential is 85 mV. Under the condition of the same current density, compared with MoS2, MoS2 / RGO and NPNi-MoS2 which are prepared under the same conditions, the nano-porous nickel-molybdenum disulfide / graphene composite material has the obvious advantages. The invention can also be expanded to the design of other catalysts, and a new thought is provided for development of efficient and low-cost catalysts.

Description

Technical field: [0001] The invention relates to a preparation method of nanoporous nickel-molybdenum disulfide / graphene composite material and its application as a catalyst in hydrogen evolution reaction. Background technique: [0002] Hydrogen has the advantages of high energy density and environmental friendliness, and is widely regarded as one of the most promising energy carriers. Platinum (Pt) is the most effective catalyst for the hydrogen evolution reaction (HER), but its scarcity and high cost severely limit its application. In recent years, most studies on HER have focused on finding a resource-rich material that can replace Pt as a catalyst. Among many alternative catalysts for Pt, molybdenum disulfide has attracted extensive attention due to its unique structural characteristics and appropriate hydrogen absorption free energy. [0003] Molybdenum disulfide, as an efficient and promising HER catalyst to replace Pt, has been confirmed by theoretical simulations a...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06B22F9/22B82Y40/00
CPCB22F9/22B82Y40/00C25B1/04C25B11/091Y02E60/36
Inventor 杨春成陈丽新杜丽文子赵明李建忱蒋青
Owner JILIN UNIV