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Preparation method of Co1-xS-MoS2-nitrogen-doped carbon HER/OER bifunctional catalyst

A bifunctional catalyst, nitrogen-doped carbon technology, which can be used in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., and can solve problems such as few reports

Active Publication Date: 2021-08-27
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hexagonal Co 1-x S is rarely reported

Method used

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  • Preparation method of Co1-xS-MoS2-nitrogen-doped carbon HER/OER bifunctional catalyst
  • Preparation method of Co1-xS-MoS2-nitrogen-doped carbon HER/OER bifunctional catalyst
  • Preparation method of Co1-xS-MoS2-nitrogen-doped carbon HER/OER bifunctional catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0033] CoCl 2 ·6H 2 O and urea were dissolved in 40 mL of deionized water at room temperature, in which CoCl 2 The concentration of urea is 0.15M, and the mass fraction of urea is 6.25wt.%. Take the hydrophilic carbon paper and immerse it in the solution, and then keep it at 90°C for 2 hours. After cooling to room temperature, take out the carbon paper and rinse it with deionized water three times. , dry for later use. Then pre-oxidize in the air at 400°C for 0.5h, and then sinter at 600°C in S atmosphere for 2h to obtain Co 9 S 8 array of nanorods. Dissolve 0.492g of molybdenum chloride and 100mg of bipyridine in 2.85ml of N,N dimethylformamide and 0.15ml of Tx-100 solution, stir and dissolve to obtain a 600mM molybdenum chloride nitrogen carbon solution. The above grown Co 9 S 8 The carbon paper of the nanorod array was soaked in the molybdenum chloride nitrogen carbon solution at room temperature for 1 min, and then dried on a hot stage at 80°C for 10 min to obtain C...

Embodiment 2

[0048] The preparation steps are the same as in Example 1, only the quality of molybdenum chloride is 0.164g, and the molybdenum chloride nitrogen carbon solution of 300mM is obtained, and Co 1-x S-MoS 2 - Nitrogen doped carbon (NC) in situ electrodes.

[0049] figure 2 Electrode prepared for Example 2 (a) HER linear voltammetry (LSV) diagram and (b) OER LSV diagram. It can be seen from figure (a) that when the current density of the electrode is 10mA / cm 2 , the overpotential required for HER reaction to produce hydrogen in alkaline aqueous solution is only 80mV; when the current density is 100mA / cm 2 When the corresponding overpotential is only 143mV; when the current density is 400mA / cm 2 , the corresponding overpotential is only 248mV. This reflects the excellent catalytic hydrogen evolution performance of the material. It can be seen from the figure (b) that when the current density of the electrode is 10mA / cm 2 , the overpotential corresponding to OER reaction oxyge...

Embodiment 3

[0051] The preparation steps are the same as in Example 1, only the quality of molybdenum chloride is 0.328g, and the molybdenum chloride nitrogen carbon solution of 400mM is obtained, and Co 1-x S-MoS 2 - Nitrogen doped carbon (NC) in situ electrodes.

[0052] image 3 Electrodes prepared for Example 3 (a) HER linear voltammetry (LSV) diagram and (b) OER LSV diagram. It can be seen from figure (a) that when the current density of the electrode is 10mA / cm 2 , the overpotential required for HER reaction to produce hydrogen in alkaline aqueous solution is only 70mV; when the current density is 100mA / cm 2 When the corresponding overpotential is only 142mV; when the current density is 400mA / cm 2 , the corresponding overpotential is only 212mV. This reflects the excellent catalytic hydrogen evolution performance of the material. It can be seen from the figure (b) that when the current density of the electrode is 10mA / cm 2 , the overpotential corresponding to OER reaction oxy...

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Abstract

The invention provides a preparation method of a Co1-xS-MoS2- nitrogen-doped carbon ternary composite material with double functions. The preparation method comprises the following steps: firstly, obtaining a cobalt precursor array growing on a carbon paper substrate through chemical bath deposition, and then, obtaining a cubic phase Co9S8 nanorod array through oxidation and vulcanization; dissolving molybdenum salt, dipyridyl or phenanthroline and a carbon source in an N, N-dimethylformamide solution to obtain a Mo < 5 + >-N-C precursor solution, coating the precursor solution on a substrate on which the Co9S8 array structure grows, and performing drying; and with argon or nitrogen taken as a protective gas and a carrier gas, and thesublimation S elementary substance powder as a solid evaporation source, carrying out chemical vapor deposition reaction to obtain a hexagonal-phase Co1-xS and MoS2 and NC compound array. The product obtained by the technical scheme of the invention has the advantages of low equipment requirement, low cost of required raw materials, easy control of reaction conditions, simple production process, good consistency of the formed product, small environmental pollution and the like, and can be used for multifunctional electrocatalysts of HER and OER.

Description

technical field [0001] The invention relates to the preparation of multi-component multifunctional materials, and its application belongs to the field of electrocatalysis and energy conversion materials and devices. Background technique [0002] In the 21st century, the environmental problems caused by the greenhouse effect are intensifying. The glaciers are receding, the climate zone is moving northward, the frequency of extremely hot weather is increasing, and the incidence of respiratory diseases is increasing. The large-scale emergence of these environmental problems has begun to make people seek a clean and sustainable new energy alternative to fossil fuels. Among them, hydrogen has the characteristics of high combustion calorific value, which is 3 times that of gasoline, 3.9 times that of alcohol, and 4.5 times that of coke. Moreover, the product of its combustion is water, which will not cause any harm to the environment. It is rich in resources, sustainable develop...

Claims

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Application Information

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IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/33
Inventor 黄妞骆禅杨柳李佳乐
Owner CHINA THREE GORGES UNIV
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