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Preparation method and application of bismuth tungstate-graphene-conductive hydrogel

A conductive hydrogel, bismuth tungstate technology, applied in chemical instruments and methods, electrodes, electrolysis processes, etc., can solve the problems of poor catalytic performance and inability to recycle, and achieve the advantages of preventing agglomeration, improving electrocatalytic performance, and convenient recycling. Effect

Active Publication Date: 2020-07-31
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the present invention provides a preparation method of bismuth tungstate-graphene-conductive hydrogel and its application, which is used to solve the problem in the prior art that the catalyst used for the hydrogen evolution reaction of the electrolyzed water cathode has catalytic performance Poor and unrecoverable technical defects

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  • Preparation method and application of bismuth tungstate-graphene-conductive hydrogel
  • Preparation method and application of bismuth tungstate-graphene-conductive hydrogel

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Embodiment 1

[0040] Step 1, weigh 1mmol sodium tungstate (Na2WO 4 2H 2 O), 2mmol bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) mix with 0.05gCTAB and dissolve in 80ml deionized water, stir at 60°C at a speed of 500r / min for 30min until uniform, transfer to a hydrothermal kettle for hydrothermal reaction, wherein the temperature of the hydrothermal reaction is 120°C, The hydrothermal reaction time is 20h. After the hydrothermal reaction is completed, the lamellar bismuth tungstate is obtained by washing and drying in sequence; the washing method is three times with water and ethanol respectively, and the drying method is: drying at 60°C for 10 hours.

[0041] Step 2: Take 400 mg of the lamellar bismuth tungstate obtained in the previous step, dissolve it in 200 ml of deionized water, and ultrasonically peel it off after dissolving to obtain dispersed two-dimensional bismuth tungstate nanosheets; wherein, the frequency of ultrasonic dispersion is 20KHz, and the time of ultrasonic dispersion is ...

Embodiment 2

[0049] Step 1, weigh 1mmol sodium tungstate (Na2WO 4 2H 2 O), 2mmol bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) mix with 0.05gCTAB and dissolve in 80ml deionized water, stir at 70°C at a speed of 800r / min for 10min until uniform, transfer to a hydrothermal kettle for hydrothermal reaction, wherein the temperature of the hydrothermal reaction is 130°C, The hydrothermal reaction time is 24h. After the hydrothermal reaction is completed, the lamellar bismuth tungstate is obtained by washing and drying in sequence; the washing method is three times with water and ethanol respectively, and the drying method is: drying at 60°C for 10 hours.

[0050] Step 2: Take 400 mg of the lamellar bismuth tungstate obtained in the previous step, dissolve it in 200 ml of deionized water, and ultrasonically peel it off after dissolving to obtain dispersed two-dimensional bismuth tungstate nanosheets; wherein, the frequency of ultrasonic dispersion is 25KHz, and the time of ultrasonic dispersion is ...

Embodiment 3

[0058] Step 1, weigh 1mmol sodium tungstate (Na2WO 4 2H 2 O), 2mmol bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) mix with 0.05gCTAB and dissolve in 80ml deionized water, stir at 80°C at a speed of 1000r / min for 20min until uniform, transfer to a hydrothermal kettle for hydrothermal reaction, wherein the temperature of the hydrothermal reaction is 160°C, The hydrothermal reaction time is 18h. After the hydrothermal reaction is completed, the lamellar bismuth tungstate is obtained by washing and drying in sequence; the washing method is three times with water and ethanol respectively, and the drying method is: drying at 60°C for 10 hours.

[0059] Step 2: Take 400mg of bismuth tungstate flakes obtained in the previous step, dissolve them in 200ml of deionized water, and ultrasonically peel off after dissolving to obtain dispersed two-dimensional bismuth tungstate nanosheets; wherein, the frequency of ultrasonic dispersion is 22KHz, and the time of ultrasonic dispersion is for 3h. ...

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Abstract

The invention belongs to the technical field of research and development of electrolytic catalysts, and particularly relates to a preparation method and application of bismuth tungstate-graphene-conductive hydrogel. The invention provides a preparation method of bismuth tungstate-graphene-conductive hydrogel. The preparation method comprises the following steps: preparing bismuth tungstate througha hydrothermal reaction, performing ultrasonic stripping, preparing graphene quantum dots, performing laser corrosion compounding, performing crosslinking polymerization, performing aniline leaching,and performing secondary polymerization. The invention also provides an application of the product obtained by the preparation method in an electrolytic catalyst. By introducing the graphene quantumdots, the active sites of bismuth tungstate are increased so as to improve the electro-catalytic performance; furthermore, the bismuth tungstate-graphene composite material is combined with conductivegel, so that bismuth tungstate-graphene is further uniformly dispersed, the catalyst agglomeration is prevented, the catalytic area of the catalyst is increased, and the gel is convenient to recoverafter the catalysis is completed. The technical defects that in the prior art, a catalyst for photoelectric degradation or water electrolysis cathode hydrogen evolution reaction is poor in catalytic performance and cannot be recycled are overcome.

Description

technical field [0001] The invention belongs to the technical field of electrolytic catalyst research and development, and in particular relates to a preparation method and application of a bismuth tungstate-graphene-conductive hydrogel. Background technique [0002] Environmental and energy issues are a major issue facing mankind. In order to realize the sustainable development of human resources, we need to devote ourselves to the development of clean energy systems, reduce pollutant emissions and protect the ecological environment. Renewable energy includes solar energy, wind energy, hydrogen energy, biomass energy, etc. [0003] Hydrogen energy is a clean and renewable dye. The combustion of hydrogen can provide three times the energy compared with ordinary fossil fuels. At the same time, the product is non-polluting, has zero pollutant emissions, and can be recycled. Since the electrolysis of water was first reported, this method has received extensive attention and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L79/02C08L33/26C08F220/56C08F222/38C08G73/02B01J31/34B01J23/31C25B1/04C25B11/06
CPCC08J3/075C08F220/56C08G73/0266B01J31/34B01J23/31C25B1/04C08J2379/02C08J2433/26C08K3/24C08K3/042C25B11/091B01J35/23B01J35/33B01J35/61C08F222/385Y02E60/36
Inventor 刘璞魏子晔李振邦王建兴刘才超杨国伟石磊
Owner SUN YAT SEN UNIV
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