MoS2-RGO-NiO@Ni foam composite photoelectrocatalytic hydrogen evolution material and preparation method thereof

A mos2-rgo-nio, composite material technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve the problems of high hydrogen evolution overpotential and poor material cycle stability.

Active Publication Date: 2020-03-13
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a 2 A sol composed of polyethylene glycol (PEG) was dip-coated on pre-oxidized nickel foam to construct a MoS-containing 2 , RGO and in-situ NiO foam Ni-based composite materials and their preparation methods to solve the problems of high hydrogen evolution overpotential and poor cycle stability of current electrocatalytic hydrogen production materials

Method used

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  • MoS2-RGO-NiO@Ni foam composite photoelectrocatalytic hydrogen evolution material and preparation method thereof
  • MoS2-RGO-NiO@Ni foam composite photoelectrocatalytic hydrogen evolution material and preparation method thereof
  • MoS2-RGO-NiO@Ni foam composite photoelectrocatalytic hydrogen evolution material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Dissolve dodecamolybdophosphoric acid, methylisothiourea and polysorbate in 120mL deionized water at a weight ratio of 5:6:1 under constant stirring, and transfer the mixed solution into polytetrafluoroethylene In a lined stainless steel autoclave, hydrothermal treatment at 180 °C for 24 h, the obtained MoS 2 Wash with deionized water, centrifuge, and vacuum dry before use. (2) RGO is prepared by processing natural graphite powder with the improved Hummer method. (3) Add 18g PEG4000 into 100mL deionized water, heat to dissolve, and dissolve the MoS obtained in step (1) 2 0.4 g and 0.05 g of RGO obtained in step (2) were sequentially dispersed in PEG solution, and ultrasonically treated for 30 min to form a suspension sol. (4) Soak nickel foam in 0.2M nitric acid solution for 30min to obtain pre-oxidized NiO@Ni. (5) The NiO@Ni obtained in step (4) was immersed in the suspension sol obtained in step (3) for 2 min, then pulled at a speed of 1 mm / s and dried at 60 °C...

Embodiment 2

[0030] (1) Dissolve ammonium molybdate, thiourea and fatty acid glyceride in 120mL deionized water at a weight ratio of 4:7:1 under constant stirring, and transfer the mixed solution to a stainless steel high-pressure tank lined with polytetrafluoroethylene. In the reactor, hydrothermal treatment at 160 °C for 30 h, the obtained MoS 2 Wash with deionized water, centrifuge, and vacuum dry before use. (2) RGO is prepared by processing natural graphite powder with the improved Hummer method. (3) Add 16g PEG6000 into 100mL deionized water, heat to dissolve, and dissolve the MoS obtained in step (1) 2 0.3 g and 0.06 g of RGO obtained in step (2) were dispersed in PEG solution in turn, and ultrasonically treated for 30 min to form a suspension sol. (4) Soak nickel foam in 0.8M hydrogen peroxide solution for 50min to obtain pre-oxidized NiO@Ni. (5) The NiO@Ni obtained in step (4) was immersed in the suspension sol obtained in step (3) for 1 min, then pulled at a speed of 1 mm / s an...

Embodiment 3

[0032] (1) Dissolve sodium molybdate, vinylthiourea and sorbitan fatty acid in 120mL of deionized water at a weight ratio of 6:8:1 under constant stirring, and transfer the mixed solution into a polytetrafluoroethylene-lined In a stainless steel autoclave, hydrothermal treatment at 170 °C for 26 h, the obtained MoS 2 Wash with deionized water, centrifuge, and vacuum dry before use. (2) RGO is prepared by processing natural graphite powder with the improved Hummer method. (3) Add 20g PEG2000 into 100mL deionized water, heat to dissolve, and dissolve the MoS obtained in step (1) 2 0.5 g and 0.07 g of RGO obtained in step (2) were dispersed in PEG solution in turn, and ultrasonically treated for 30 min to form a suspension sol. (4) Soak the nickel foam in a 0.5M potassium permanganate solution for 40 minutes to obtain pre-oxidized NiO@Ni. (5) The NiO@Ni obtained in step (4) was immersed in the suspension sol obtained in step (3) for 3 min, then pulled at a speed of 1 mm / s and ...

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Abstract

The invention discloses a MoS2-RGO-NiO@Ni foam hydrogen evolution material prepared by sol dip-coating method, and a preparation method of the MoS2-RGO-NiO@Ni foam hydrogen evolution material. The preparation method specifically comprises the following steps: (1) dissolving a molybdenum compound, a sulfur compound and a non-ionic surfactant in deionized water at a weight ratio of (2-10): (4-12): 1, and carrying out hydrothermal treatment at 140-200 DEG C for 16-36 hours to obtain MoS2; (2) treating natural graphite powder by using an improved Hummer method to prepare RGO; (3) soaking foamed nickel in a 0.2-1.0 M solution containing an oxidizing agent for 20-50 min to obtain NiO@Ni; (4) dispersing the prepared MoS2 and RGO into a PEG solution to obtain a suspended sol solution; and (5) dipping NiO@Ni in the suspension sol solution for multiple times of dipping, pulling, and drying, carrying out programmed heating roasting under atmosphere protection, and carrying out heat preservation to obtain the three-dimensional porous foamed nickel-based photoelectrocatalytic hydrogen evolution composite material.

Description

technical field [0001] The invention relates to a sol dip coating method for preparing MoS 2 -RGO-NiO@Ni foam hydrogen evolution composite material and its preparation method, specifically involving the pre-oxidation of foamed nickel to obtain nickel-based nickel oxide, and the newly prepared MoS 2 , RGO is dispersed in PEG solution to obtain a suspension sol solution, which is obtained by immersing, pulling and drying for many times, programmed temperature rise roasting under atmosphere protection, natural cooling after heat preservation under reducing atmosphere, and the prepared material shows excellent photoelectricity Catalytic decomposition of water to produce hydrogen. Background technique [0002] In order to develop renewable and clean energy, especially hydrogen (H 2 ) To replace traditional fossil fuels with new technologies, scientific and technological workers have made a lot of efforts. Photocatalytic / electrocatalytic hydrogen evolution reaction (HER) is con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J35/00C25B1/04C25B11/06
CPCB01J27/0515B01J35/0033B01J35/004C25B1/04C25B11/051Y02E60/36
Inventor 阎建辉黄杨张丽杨海华杨鹏
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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