A kind of preparation method of transition group metal/carbon tube/graphene electrocatalyst for hydrogen evolution reaction

A transition metal, hydrogen evolution reaction technology, applied in the fields of materials and energy, can solve the problems of reduced catalytic activity and stability, large size of metal particles, cumbersome preparation process, etc., to achieve inhibition of agglomeration, excellent electrical conductivity, high catalytic activity Effect

Active Publication Date: 2020-01-10
FUDAN UNIV
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Problems solved by technology

However, these hybrid composites also face some problems, such as cumbersome preparation process, high cost, large metal particle size, poor dispersion, and easy agglomeration, which lead to the reduction of catalytic activity and stability, so it is urgent to develop new Economical and efficient water electrolysis HER electrocatalyst

Method used

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  • A kind of preparation method of transition group metal/carbon tube/graphene electrocatalyst for hydrogen evolution reaction
  • A kind of preparation method of transition group metal/carbon tube/graphene electrocatalyst for hydrogen evolution reaction
  • A kind of preparation method of transition group metal/carbon tube/graphene electrocatalyst for hydrogen evolution reaction

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1, Co@N-CNTs@rGO composite material and its preparation method and application, including the following steps:

[0022] (1) The cubic ZIF-8 template (ZIF-8@GO) of composite graphene was prepared by co-precipitation method: 150–300 mg of Zn(NO 3 ) 2 ·6H 2 0 and 5 mg of CTAB were added to 10 mL of graphene oxide suspension, fully stirred to obtain a mixed solution; the mixed solution was added to 40 mL of 2-methylimidazole solution, stirred at room temperature for 30 min, the product was separated by centrifugation, washed with ethanol solution for 3-4 times, and finally placed in a freeze dryer at -50 °C, and freeze-dried for 36-72 h, and the obtained product was ZIF-8@GO;

[0023] (2) Preparation of graphene-wrapped core-shell bimetallic zeolite imidazole-based framework (ZIF-67@ZIF-8@GO): Weigh 100 mg of ZIF-8@GO obtained in step (1) and uniformly disperse in methanol solution, sonicate for 20 min, then add 3ml of 2-methylimidazole solution to the resulti...

Embodiment 2

[0027] Embodiment 2, Co@N-CNTs@rGO composite material and its preparation method and application, including the following steps:

[0028] (1) The cubic ZIF-8 template of composite graphene (ZIF-8@GO) was prepared by co-precipitation method: 300–400 mg of Zn(NO 3 ) 2 ·6H 2 0 and 5 mg of CTAB were added to 10 mL of graphene oxide suspension, fully stirred to obtain a mixed solution; the mixed solution was added to 40 mL of 2-methylimidazole solution, stirred at room temperature for 30 min, the product was separated by centrifugation, washed with ethanol solution for 3-4 times, and finally placed in a freeze dryer at -50 °C, and freeze-dried for 36-72 h, and the obtained product was ZIF-8@GO;

[0029] (2) Preparation of graphene-wrapped core-shell bimetallic zeolite imidazole-based framework (ZIF-67@ZIF-8@GO): Weigh 100 mg of ZIF-8@GO obtained in step (1) and uniformly disperse in 23 mL of methanol solution, sonicated for 20 min, then added 3 ml, 895 mg of 2-methylimidazole so...

Embodiment 3

[0033] Embodiment 3, Co@N-CNTs@rGO composite material and its preparation method and application, including the following steps:

[0034] (1) The cubic ZIF-8 template of composite graphene (ZIF-8@GO) was prepared by co-precipitation method: 82.5 mg of Zn(NO 3 ) 2 ·6H 2 The CTAB of 0 and 5 mg was added respectively in the graphene oxide suspension of 10 mL, fully stirred, obtained mixed solution; Said mixed solution was joined in 40 mL, in the 2-methylimidazole solution of 2.825 g, at room temperature After stirring at low temperature for 30 min, the product was centrifuged, washed 3-4 times with ethanol solution, and finally placed in a freeze dryer at -50 °C, and freeze-dried for 72 h. The obtained product was ZIF-8@GO;

[0035] (2) Preparation of graphene-wrapped core-shell bimetallic zeolite imidazole-based framework (ZIF-67@ZIF-8@GO): Weigh 50 mg of ZIF-8@GO obtained in step (1), and evenly disperse in 23 mL In methanol solution, sonicate for 20 min, then add 3 ml of a ...

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Abstract

The invention discloses a preparation method of a transition group metal / carbon pipe / graphene electrocatalyst for a hydrogen evolution reaction. A core-shell bimetallic zeolite imidazolyl framework coated with oxidized graphene acts as a precursor, GO is subjected to thermal reduction by a one-step heating process so that rGO is obtained, ZIF-67@ZIF-8 nano particles are subjected to in-situ carbonization so that an N-doped carbon nano tube coated with superfine Co nano particles, and thus a Co@N-CNTs@rGO composite is prepared. The composite has the advantages of a unique three-dimensional hierarchic structure, high porosity, rich N-doped property, high conductivity of rGO, homogeneous dispersion of Co nano particles, and the like, so that when the composite acts as a catalyst for HER, thecomposite shows excellent electro-catalytic characteristics. The obtained composite is high in conductivity, multiple in active sites and good in electro-catalytic property, the cost of raw materialsfor preparation is low, a technology is simple, reaction energy consumption is low, large-scale preparation can be realized, and the preparation method is an efficient and economical novel HER electrocatalyst preparation method.

Description

technical field [0001] The invention belongs to the technical field of materials and energy, and in particular relates to a transition metal / carbon nanotube / graphene three-dimensional hierarchical composite electrocatalyst for efficient hydrogen evolution reaction and a preparation method thereof. Background technique [0002] With the increasingly severe environmental problems and the emergence of energy shortages, the development of green and sustainable energy conversion and storage technologies has become the center of research for many researchers. Hydrogen has become a focus of attention in the scientific community due to its high calorific value and environmental friendliness. Hydrogen production by electrolysis of water is of particular interest due to its high efficiency, convenience, and environmental protection. However, the cathodic reaction for water electrolysis involves a multi-step proton-coupled electron transfer process with slow reaction thermodynamics an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/06B22F9/24C01B32/16C01B32/184
CPCB22F9/24C25B1/04C01B32/16C01B32/184C25B11/091Y02E60/36
Inventor 吴仁兵刘洋陈子亮哈媛
Owner FUDAN UNIV
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