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A multi-level catalytic structure composite material for efficient electrolysis of water and hydrogen evolution and its preparation method

A technology of composite materials and electrolysis of water, which is applied in the field of electrocatalytic material preparation, can solve the problems of further improvement of catalytic hydrogen evolution performance, uneven distribution of catalytic active sites, low activity of catalytic sites, etc., to achieve controllable growth, low Effect of low overpotential and raw material cost

Active Publication Date: 2022-04-22
XI AN JIAOTONG UNIV
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Problems solved by technology

Although there have been many researches on hydrogen evolution catalysts, there are still some problems in the prepared hybrid composite materials, such as uneven distribution of catalytic active sites, few catalytic active sites, low activity of catalytic sites, and the performance of catalytic hydrogen evolution remains to be seen. Further improve

Method used

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  • A multi-level catalytic structure composite material for efficient electrolysis of water and hydrogen evolution and its preparation method
  • A multi-level catalytic structure composite material for efficient electrolysis of water and hydrogen evolution and its preparation method
  • A multi-level catalytic structure composite material for efficient electrolysis of water and hydrogen evolution and its preparation method

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preparation example Construction

[0057] The preparation method of the multi-level structure composite material used for high-efficiency electrolysis of water and hydrogen evolution of the present invention comprises the following steps:

[0058] 1) Take the raw material Co(NO 3 ) 2 ·6H 2 O, 2-methylimidazole and methanol;

[0059] Among them, Co(NO 3 ) 2 ·6H 2 O was used as the Co source, 2-methylimidazole provided the organic ligand, and methanol was used as the organic solvent to prepare the metal-organic framework ZIF-67, in which Co(NO 3 ) 2 ·6H 2 O and 2-methylimidazole were respectively dissolved in methanol and then mixed, and the Co(NO 3 ) 2 ·6H 2 The molar concentration of O is 40-60 mmol / L, and the molar concentration of 2-methylimidazole is 110-130 mmol / L.

[0060] 2) Co(NO 3 ) 2 ·6H 2 After mixing O, 2-methylimidazole and methanol, first stir at a rate of 1000-1200 rpm for 5-10 min, then slowly stir at a rate of 300-500 rpm for 3-6 h, filter by vacuum filtration, and use methanol Ce...

Embodiment 1

[0066] In this embodiment, the method for preparing a multi-level structure composite material for high-efficiency electrolysis of water and hydrogen evolution includes the following steps:

[0067] 1) Take the raw material Co(NO 3 ) 2 ·6H 2O, 2-methylimidazole and methanol, weigh 4.66 g of Co(NO 3 ) 2 ·6H 2 O and 3.94 g of 2-methylimidazole were added to 200 ml of methanol, stirred at a rate of 1000 rpm for 10 minutes and then ultrasonically dissolved for 5 minutes, and the methanol solution containing cobalt nitrate was poured into the methanol solution containing 2-methylimidazole , stirred at 1000 rpm for 5 min, then slowly stirred at 300 rpm for 4 h, filtered by vacuum filtration, washed with methanol for 3 times, and finally placed in a vacuum oven at 60 °C for 24 h to obtain ZIF-67 Powder. The microscopic appearance of gained ZIF-67 powder is as follows figure 1 As shown, the generally dodecahedral large particles (~1 μm) have a rough surface and are loaded with ...

Embodiment 2

[0074] In this embodiment, the method for preparing a multi-level structure composite material for high-efficiency electrolysis of water and hydrogen evolution includes the following steps:

[0075] 1) Take the raw material Co(NO 3 ) 2 ·6H 2 O, 2-methylimidazole and methanol, weigh 5.82 g of Co(NO 3 ) 2 ·6H 2 O and 3.61 g of 2-methylimidazole were added to 200 ml of methanol respectively, stirred at a rate of 1100 rpm for 10 min and then ultrasonically dissolved for 5 min, and the methanol solution containing cobalt nitrate was poured into the methanol containing 2-methylimidazole The solution was stirred at 1100 rpm for 10 min, then slowly stirred at 400 rpm for 3 h, filtered by vacuum filtration, washed with methanol for 3 times, and finally placed in a vacuum oven at 80 °C for 18 h to obtain ZIF- 67 powder. The microscopic appearance of gained ZIF-67 powder is as follows Figure 8 As shown, the surface of large particles (~1 μm) is rough and loaded with small particl...

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Abstract

The invention discloses a multi-level structure composite material for high-efficiency electrolysis of water and hydrogen evolution and a preparation method thereof, comprising the following process: performing pyrolytic carbonization on a powdery ZIF-67 material to obtain a Co@NC material, and preparing the powdery In the mixed solution of ZIF‑67 material, Co(NO 3 ) 2 ·6H 2 The molar concentration of O is 40-60mmol / L, and the molar concentration of 2-methylimidazole is 110-130mmol / L; the GO suspension is mixed with the Co@NC suspension to obtain a mixed solution B, and the mixed Liquid B was ultrasonically dispersed, and after the dispersion was uniform, it was vacuum filtered, dried, and ground to obtain a powdery Co@NC / GO composite material; the Co@NC / GO composite material was fully oxidized to obtain Co 2 o 3 @NC / GO Composite; to Co 2 o 3 Phosphating and selenization of @NC / GO composite materials to obtain the multi-level structure composite material CoP‑CoSe for efficient electrolysis of water and hydrogen evolution 2 @NC / rGO. Generate CoP‑CoSe 2 @NC / rGO multi-level structure catalytic material has the advantages of uniform growth of CNTs, controllable doping, multi-level catalytic sites, etc., high catalytic hydrogen evolution performance, and low raw material cost, easy to achieve large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrocatalytic materials, and in particular relates to a multi-level structure composite material for high-efficiency electrolysis of water and hydrogen evolution and a preparation method thereof. Background technique [0002] Energy is related to the level of economic development of society and is inseparable from the improvement of people's living standards. Traditional fossil fuel energy is not renewable, and it is urgent to develop new renewable energy. As a clean energy, hydrogen energy has the advantages of high calorific value, wide range of sources, and no pollution. However, the electrolysis of water to produce hydrogen energy still faces some problems. The main reason is that the polarization of the electrodes leads to high hydrogen evolution overpotential and consumes too much electric energy, which hinders the efficiency of electrolysis of water to produce hydrogen. In respon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04B82Y30/00B82Y40/00
CPCC25B11/04C25B1/04B82Y30/00B82Y40/00Y02E60/36
Inventor 郭大刚高燕鲍崇高罗浩
Owner XI AN JIAOTONG UNIV
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