Preparation method and application of a molybdenum disulfide composite bifunctional electrocatalyst

A composite material, molybdenum disulfide technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, electrodes, etc., can solve the problems of insufficient conductivity, low atom utilization rate, hindering the application of molybdenum disulfide, etc., and achieve cost The effect of low, improved atom utilization, and enriched catalytic active sites

Active Publication Date: 2020-06-26
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problems of insufficient conductivity and low atom utilization hinder the further application of molybdenum disulfide in the direction of electrocatalysis.

Method used

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  • Preparation method and application of a molybdenum disulfide composite bifunctional electrocatalyst
  • Preparation method and application of a molybdenum disulfide composite bifunctional electrocatalyst
  • Preparation method and application of a molybdenum disulfide composite bifunctional electrocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of bifunctional electrocatalyst of molybdenum disulfide composite material, its preparation method comprises the steps:

[0034] (1) Dissolve 0.075 moles of dimethylimidazole and 0.02 moles of zinc nitrate hexahydrate in 150 ml of methanol respectively, mix them together after the two are completely dissolved, then stir at room temperature for 24 hours, and finally centrifuge and dry Overnight, get ZIF-8;

[0035] (2) 0.075 moles of dimethylimidazole and 0.02 moles of cobalt nitrate hexahydrate and 0.5 grams of ZIF-8 obtained in step (1) were dissolved in 100 milliliters of methanol respectively, and mixed together after the three were completely dissolved , then stirred at room temperature for 24 hours, and finally centrifuged, washed and dried overnight to obtain ZIF-8@ZIF-67;

[0036] (3) Take the ZIF-8@ZIF-67 obtained in step (2) and place it in a tube furnace. In an argon atmosphere, raise it to 920°C at a rate of 2°C / min, and then keep it at a constant tem...

Embodiment 2

[0040] The difference between this embodiment and embodiment 1 is:

[0041] The taking amount of dimethylimidazole described in step (1) is 0.03 mole, and the taking amount of described zinc nitrate hexahydrate is 0.008 mole;

[0042] The taking amount of dimethylimidazole described in step (2) is 0.03 mole, and the taking amount of described cobalt nitrate hexahydrate is 0.008 mole, and the taking amount of described ZIF-8 is 0.2 gram;

[0043] After placing ZIF-8@ZIF-67 in the tube furnace in step (3), in an argon atmosphere, the temperature is raised to 800°C at a rate of 2°C / min;

[0044] The amount of C-N / Co described in step (4) is 6 mg, the amount of N, N-dimethylformamide is 15 milliliters, and the amount of ammonium tetrathiomolybdate added is 14.9 mg, The addition amount of described hydrazine hydrate is 0.36 milliliters.

[0045] Others are the same as embodiment 1.

Embodiment 3

[0047] The difference between this embodiment and embodiment 1 is:

[0048] The taking amount of dimethylimidazole described in step (1) is 0.045 mole, and the taking amount of described zinc nitrate hexahydrate is 0.012 mole;

[0049] The taking amount of dimethylimidazole described in step (2) is 0.045 mole, and the taking amount of described cobalt nitrate hexahydrate is 0.012 mole, and the taking amount of described ZIF-8 is 0.3 gram;

[0050] The amount of C-N / Co described in step (4) is 9 mg, the amount of N, N-dimethylformamide is 15 milliliters, and the amount of ammonium tetrathiomolybdate added is 22.3 mg, The addition amount of described hydrazine hydrate is 0.54 milliliters.

[0051] Others are the same as embodiment 1.

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Abstract

The invention discloses a preparation method and application of a bifunctional electrocatalyst of a molybdenum disulfide composite material, and belongs to the technical field of electrocatalysts. Thepreparation method comprises the following steps: preparing a precursor ZIF-8@ZIF-67 at first, carrying out carbonization to obtain C-N / Co, then adding C-N / Co, ammonium tetrathiomolybdate and hydrazine hydrate into N,N-dimethylformamide together, preliminarily preparing a molybdenum disulfide composite material through a solvothermal method, and finally, stabilizing molybdenum disulfide compositematerial by heat treatment to obtain a molybdenum disulfide composite material C-N / Co4S3@MoS2. The molybdenum disulfide composite material can be used in hydrogen evolution reactions or oxygen evolution reactions. The molybdenum disulfide composite material has strong conductivity, high atom utilization rate and excellent catalytic performance, and has the advantages of low cost, high efficiency,stability and the like.

Description

technical field [0001] The invention relates to the field of electrocatalysts, in particular to a preparation method and application of a molybdenum disulfide composite bifunctional electrocatalyst. Background technique [0002] With the increasing pollution caused by burning fossil fuels, there is an urgent need to find alternative clean energy sources, such as hydrogen and oxygen. Although hydrogen and oxygen can be obtained by electrolyzing water, it consumes a lot of electricity. Therefore, electrocatalysts are required to reduce the overpotentials of hydrogen evolution reaction and oxygen evolution reaction to save energy. Currently, the best catalysts for hydrogen evolution and oxygen evolution reactions are noble metal platinum and noble metal oxides (ruthenium oxide and yttrium oxide). However, their expensive, scarce reserves, and unstable nature hinder their further application and market development. Therefore, it is necessary to develop a cheap, efficient, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/051C25B11/06C25B1/04
CPCB01J27/0515B01J35/0033C25B1/04C25B11/04Y02E60/36
Inventor 王志娟包成刘霞蔡永亮孟静
Owner NANJING TECH UNIV
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