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Molybdenum disulfide nanoflowers supported zinc oxide quantum dots and its application in ammonia synthesis electrocatalyst

A technology of molybdenum disulfide and nanoflowers, which is applied in the direction of electrodes, electrolytic components, electrolytic processes, etc., can solve the problems of poor inherent conductivity and restricted catalytic activity, and achieve the effects of improving catalytic activity, increasing electron transfer rate, and simple preparation method

Active Publication Date: 2022-04-22
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, recent studies have found that MoS 2 The band gap is 1.73 (ev) wide, and the intrinsic conductivity is poor, which seriously restricts the improvement of catalytic activity.

Method used

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  • Molybdenum disulfide nanoflowers supported zinc oxide quantum dots and its application in ammonia synthesis electrocatalyst
  • Molybdenum disulfide nanoflowers supported zinc oxide quantum dots and its application in ammonia synthesis electrocatalyst
  • Molybdenum disulfide nanoflowers supported zinc oxide quantum dots and its application in ammonia synthesis electrocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Add 1.24g of ammonium molybdate into 50mL of deionized water to dissolve to form a transparent solution, then add 2.28g of thiourea into it, stir to dissolve, then add 1ml of 3mol / L hydrochloric acid solution, stir for half an hour and ultrasonically disperse evenly, and finally the obtained The liquid was added to a 50ml reaction kettle with a polytetrafluoroethylene liner, hydrothermally reacted at 200°C for 24h, washed by centrifugation and dried in a vacuum oven. The sample is molybdenum disulfide nanoflowers, (see attached figure 1 ). Take 0.3g sample molybdenum disulfide nanoflowers and add it to 50ml of dehydrated ethanol containing 2.36g of zinc acetate and ice bath for 1 hour, stir while ice bathing, then add 35ml of dehydrated ethanol solution with 1gKOH to the above obtained solution dropwise. In the solution, stir for two hours while adding it dropwise, then let it stand for one hour, and finally keep it warm at 80°C for one hour. After centrifugal vacuum ...

Embodiment 2

[0025] Add 1.24g of ammonium molybdate into 30mL of deionized water to dissolve to form a transparent solution, then add 2.28g of thiourea into it, stir to dissolve, add 1ml of 3mol / L hydrochloric acid solution to it, stir for half an hour and ultrasonically disperse evenly, and finally the obtained The liquid was added to a 50ml reaction kettle with a polytetrafluoroethylene liner, hydrothermally reacted at 160°C for 18h, washed by centrifugation and dried in a vacuum oven. The sample is molybdenum disulfide nanoflowers. Take 0.3g sample of molybdenum disulfide nanoflowers and add it to 50ml of dehydrated ethanol containing 1g of zinc acetate and ice bath for 1 hour, stir while ice bathing, then add 50ml of dehydrated ethanol solution with 0.1g KOH dissolved in the above In the obtained solution, stir for two hours while adding it dropwise, then let it stand for one hour, and finally keep it warm at 80° C. for one hour, and dry it in a centrifugal vacuum. The sample is an amm...

Embodiment 3

[0027] Add 1.24g ammonium molybdate to 40mL deionized water to dissolve to form a transparent solution, then add 2.28g thiourea to it, stir to dissolve, add 10ml 3mol / L hydrochloric acid solution to it, stir for half an hour and ultrasonically disperse evenly, and finally the obtained The liquid was added to a 50ml reaction kettle with a polytetrafluoroethylene liner, hydrothermally reacted at 170°C for 20h, washed by centrifugation and dried in a vacuum oven. The sample is molybdenum disulfide nanoflowers, synthetic ammonia yield and Faradaic efficiency (see attached Figure 7 )From Figure 7 It can be seen that the overall efficiency is the best at -0.1V. At this time, the faradaic efficiency of electrochemical synthesis of ammonia is 3.34%, and the ammonia yield is 3.06 μg h -1 ·mg -1 cat . Take 0.3g sample of molybdenum disulfide nanoflowers and add it to 50ml of dehydrated ethanol containing 1g of zinc acetate and ice bath for 1 hour, stir while ice bathing, then add ...

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Abstract

The invention provides a method for preparing zinc oxide quantum dots supported by molybdenum disulfide nanoflowers. Ammonium molybdate and thiourea are added to a certain amount of deionized water, stirred evenly to obtain a clear solution, and then an appropriate amount of hydrochloric acid solution is added for hydrothermal reaction. Obtain molybdenum disulfide nanoflowers; add molybdenum disulfide nanoflowers to absolute ethanol containing a certain amount of zinc acetate in an ice bath, stir while ice bathing, and add an absolute ethanol solution with a certain amount of strong alkali to the above solution dropwise During the process, stir while adding dropwise, let it stand after the dropwise addition, and then keep it warm at a temperature of 80-100°C. The obtained product is washed, dried, and burned with argon gas. The burned sample is the molybdenum disulfide nanoflower loading Zinc oxide quantum dots. The prepared ammonia synthesis electrocatalyst with black zinc oxide grown on the surface of molybdenum disulfide uses the incomplete coordination of the surface atoms of black zinc oxide to increase the catalytic active sites, so that the ammonia synthesis electrocatalyst with black zinc oxide grown on the surface of molybdenum disulfide can be used in electrocatalysis at room temperature synthetic ammonia.

Description

technical field [0001] The invention belongs to the field of electrocatalytic synthesis of ammonia materials, and specifically relates to growing white zinc oxide on the surface of flake-shaped molybdenum disulfide nanoflowers, and then through high-temperature annealing treatment, turning the white zinc oxide into black zinc oxide, that is, molybdenum disulfide nano Flower-loaded zinc oxide quantum dots, the material directly has a heterojunction, which can effectively improve the electrocatalytic activity. Compared with pure molybdenum disulfide, the heterojunction composite material greatly improves the yield and Faradaic efficiency of ammonia synthesis. Background technique [0002] Mo and S elements in nitrogenase play an important role in nitrogen fixation. Molybdenum disulfide is an important member of transition metal disulfides and has many properties of semiconductors. It has a typical hexagonal structure, unique sheet structure, special The valence band and good p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/27
CPCC25B1/00
Inventor 陈少娜白斌斌代忠旭
Owner CHINA THREE GORGES UNIV
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