Electrocatalytic bifunctional material with few layers of tungsten disulfide anchored on surface of cobalt-nitrogen-doped carbon-based polyhedron and preparation method of electrocatalytic bifunctional material

A bifunctional material, tungsten disulfide technology, applied in the direction of electrodes, electrolytic components, electrolytic process, etc., can solve the problems of restricting large-scale industrial application, high cost and scarcity of the earth, so as to enrich the active sites of metals and optimize the active sites Point and conductivity, the effect of shortening the diffusion path

Active Publication Date: 2022-05-06
LUOYANG INST OF SCI & TECH
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Problems solved by technology

Electrocatalytic water splitting includes cathodic hydrogen evolution reaction and anodic oxygen evolution reaction. The driving thermodynamic potential of electrocatalysts dominated by noble metals such as Pt and Pd in ​​the hydrogen evolution reaction is close to zero. It is also used in the oxygen evolution reaction, but due to its high cost and the scarcity of the earth, which seriously limits the large-scale application of industry

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  • Electrocatalytic bifunctional material with few layers of tungsten disulfide anchored on surface of cobalt-nitrogen-doped carbon-based polyhedron and preparation method of electrocatalytic bifunctional material
  • Electrocatalytic bifunctional material with few layers of tungsten disulfide anchored on surface of cobalt-nitrogen-doped carbon-based polyhedron and preparation method of electrocatalytic bifunctional material
  • Electrocatalytic bifunctional material with few layers of tungsten disulfide anchored on surface of cobalt-nitrogen-doped carbon-based polyhedron and preparation method of electrocatalytic bifunctional material

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preparation example Construction

[0043] A method for preparing an electrocatalytic bifunctional material anchored on the surface of a cobalt-nitrogen-doped carbon-based polyhedron with few layers of tungsten disulfide, comprising the following steps:

[0044] Step 1. Weigh 0.58206g-2.9103g of cobalt nitrate hexahydrate and add it to 10-30ml of methanol to prepare solution A for later use;

[0045] Step 2. Weigh a certain amount of 2-methylimidazole and add it to 10-30ml of methanol to prepare solution B for later use; the molar ratio of cobalt ions in step 1 to 2-methylimidazole in step 2 is 1:( 3~8).

[0046] Step 3. Pour solution B obtained in step 2 into solution A obtained in step 1, then immediately add 0.01g to 0.4g of ammonium tetrathiotungstate, and stir at room temperature for 5 to 25 hours;

[0047] Step 4: Collect the product obtained in Step 3 by centrifugation. The speed of the centrifuge is 8000-10000 rpm. The upper solution is discarded to obtain the lower precipitate. The lower precipitate is...

Embodiment 1

[0050] 1) Weigh 0.58206g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) add in 15mL methanol and be mixed with solution A;

[0051] 2) Weigh 0.6169g of 2-methylimidazole and add it into 15mL of methanol to prepare solution B;

[0052] 3) Pour solution B into solution A, stir evenly to form uniform dark blue solution C;

[0053] 4) Add 0.05g ammonium tetrathiotungstate ((NH 4 ) 2 WS 4 ), vigorously stirred at room temperature for 24h, and the stirring rate was 500rpm. Centrifuge the obtained product at 8000 rpm for 5 min, discard the upper layer solution to obtain the lower layer precipitate, wash the lower layer precipitate 5 times with methanol to remove residual unreacted substances, and then vacuum dry at 50 ° C for 24 h to obtain a brown powder, which is WS 4 2- -ZIF-67;

[0054] 5) step 4) gained brown powder is placed in tube furnace, under N 2 Under the protection of atmosphere, heat up to 400°C at a heating rate of 5°C / min, hold for 2h, N 2 The working pre...

Embodiment 2

[0066] 1) Weigh 0.58206g of cobalt nitrate hexahydrate and add it into 15mL of methanol to prepare solution A;

[0067] 2) Weigh 0.6169g of 2-methylimidazole and add it into 15mL of methanol to prepare solution B;

[0068] 3) Pour solution B into solution A, stir evenly to form uniform dark blue solution C;

[0069] 4) Add 0.1 g of ammonium tetrathiotungstate to the dark blue solution C, stir vigorously at room temperature for 24 hours, and the stirring speed is 500 rpm. Centrifuge the obtained product at 8000 rpm for 5 min, discard the upper layer solution to obtain the lower layer precipitate, wash the lower layer precipitate 5 times with methanol to remove residual unreacted substances, and then vacuum dry at 50 ° C for 24 h to obtain a brown powder, which is WS 4 2- -ZIF-67;

[0070] 5) step 4) gained brown powder is placed in tube furnace, under N 2 Under the protection of atmosphere, heat up to 400°C at a heating rate of 5°C / min, hold for 2h, N 2 The working pressur...

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Abstract

The preparation method comprises the following steps: respectively weighing cobalt-containing nitrate hydrate and 2-methylimidazole, adding the cobalt-containing nitrate hydrate and the 2-methylimidazole into methanol to prepare a solution, pouring the latter solution into the former solution, then adding a tungsten source, carrying out a stirring reaction at room temperature, and carrying out suction filtration, washing and drying so as to obtain the electrocatalytic bifunctional material. Centrifuging the obtained product, centrifugally washing the lower precipitate with methanol, drying at 50-70 DEG C, and calcining the obtained WS42-ZIF-67 at two stages of different temperatures in an inert atmosphere; and naturally cooling to obtain the electro-catalysis bifunctional material with few layers of WS2 nanosheets anchored on the surface of the cobalt-nitrogen-doped carbon-based polyhedron. The preparation process is simple and efficient, the requirement for equipment is low, and the prepared electro-catalytic bifunctional material is high in specific surface area, has a specific pore structure and excellent electro-catalytic performance, is used for electro-catalytic oxygen evolution and hydrogen evolution reactions and can replace noble metal catalysts such as Pt and RuO2.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic materials, and in particular relates to an electrocatalytic bifunctional material anchored on the surface of a cobalt-nitrogen-doped carbon-based polyhedron with few layers of tungsten disulfide and a preparation method thereof. Background technique [0002] As environmental concerns become increasingly prominent, the shortage of fossil fuels forces global efforts to develop clean and efficient energy conversion technologies. Hydrogen (H 2 ) as one of the most popular clean energy sources has received a lot of attention for its zero carbon footprint and highest energy output. The traditional method of producing hydrogen by decomposing fossil fuels releases a large amount of harmful gas, which will further increase the burden on the environment. [0003] Currently, electrocatalytic water splitting is a clean and sustainable method for producing hydrogen on a large scale. Because this me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B1/04
CPCC25B11/04C25B1/04Y02E60/36
Inventor 王芳潘昆明李豪夏梁彬任永鹏于华韦毕成
Owner LUOYANG INST OF SCI & TECH
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