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Preparation method of spherical carbon-coated nickel with different carbon layers and hydrogen evolution property for water electrolysis of spherical carbon-coated nickel

A carbon-coated nickel and spherical technology, which is applied in the field of transition metal carbide preparation, can solve the problems of unfavorable promotion, time-consuming, cumbersome process, etc., and achieve the effects of reducing production costs, simple equipment requirements, and reducing pollution

Inactive Publication Date: 2019-11-15
ZHENGZHOU UNIV
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  • Description
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Problems solved by technology

However, the methods for preparing these materials usually involve complex synthesis and purification processes, which are cumbersome and time-consuming, and are not conducive to the promotion of large-scale industrialization. However, solvothermal methods and solid-state reaction methods are simple to operate and easy to achieve large-scale Production, strictly control the synthesis conditions and parameters in the synthesis, and the corresponding carbon-coated nickel composite carbon materials can be obtained

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  • Preparation method of spherical carbon-coated nickel with different carbon layers and hydrogen evolution property for water electrolysis of spherical carbon-coated nickel
  • Preparation method of spherical carbon-coated nickel with different carbon layers and hydrogen evolution property for water electrolysis of spherical carbon-coated nickel
  • Preparation method of spherical carbon-coated nickel with different carbon layers and hydrogen evolution property for water electrolysis of spherical carbon-coated nickel

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Embodiment 1

[0025] Embodiment 1: Preparation of spherical carbon-coated nickel with 1 to 4 layers of carbon

[0026] Weigh 0.225g (0.15mol / L) glycine and 1.073g (0.225mol / L) nickel nitrate hexahydrate into a beaker filled with 20mL of absolute ethanol, stir magnetically for 2h, and transfer the supernatant to polytetrafluoroethylene In a high-temperature and high-pressure autoclave, react at 180°C for 12h, wash with ethanol after cooling, and dry at 60°C to obtain a green powder. Calcined at 450°C for 3h under nitrogen atmosphere, increasing 5°C per minute.

Embodiment 2

[0027] Embodiment 2: Preparation of spherical carbon-coated nickel with 5-8 layers of carbon

[0028] Weigh 0.255g (0.167mol / L) glycine and 1.274g (0.267mol / L) nickel nitrate hexahydrate into a beaker filled with 25mL absolute ethanol, stir magnetically for 2 hours, and transfer them all to polytetrafluoroethylene under high temperature and high pressure In the kettle, react at 180°C / 12h, wait for cooling, wash with ethanol suction filtration, and dry at 60°C to obtain a green powder. Calcined at 500°C for 3h under nitrogen atmosphere, increasing 5°C per minute.

[0029] The scanning electron microscope picture and the transmission electron microscope picture of the spherical carbon-coated nickel of above embodiment 1 and 2 synthesis are as Figure 1~4 As shown, and according to the picture, it can be seen that the diameter of the nanospheres is uniform, about 2 μm, and the diameter of a single carbon-coated nickel is about 10 nm.

[0030] And to the spherical carbon-coated ...

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Abstract

The invention relates to the technical field of preparation of transition metal carbides, in particular to a preparation method of spherical carbon-coated nickel with different carbon layers and a hydrogen evolution property for water electrolysis of the spherical carbon-coated nickel. The preparation method comprises the following steps: (1) uniformly dispersing nickel nitrate hexahydrate and glycine in anhydrous ethanol by mechanical stirring; (2) transferring the mixed liquid to a reaction kettle, and carrying out a reaction for 12 hours at the temperature of 180 DEG C to obtain a carbon-coated nickel precursor; and (3) conducting roasting in nitrogen under a certain temperature condition to obtain the spherical carbon-coated nickel composite materials respectively. The method has the advantages that the raw materials are cheap and easy to obtain, synthesis is facilitated, equipment is simple, the production process is pollution-free, large-scale production can be quickly realized,and the material has lots of active sites and good hydrogen evolution properties for water electrolysis.

Description

technical field [0001] The invention relates to the technical field of transition metal carbide preparation, in particular to a preparation method of spherical carbon-coated nickel with different carbon layers and its electrolytic water hydrogen evolution performance. Background technique [0002] With the increasing environmental problems such as air pollution, greenhouse effect and smog brought about by the consumption of fossil fuels (Climatic Change, 2014, 123(3-4):413-426), the development of clean, pollution-free and renewable new Energy is gradually being valued by people. Hydrogen energy is considered to be the most ideal in the future energy pattern due to its high combustion calorific value, abundant reserves, easy access, renewable nature, green and non-toxic combustion products, easy storage and transportation. energy carrier. Electrocatalytic water splitting is an important way to achieve industrial hydrogen production (Nanoscale, 2014, 6(21):12490-12499). Curr...

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Application Information

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IPC IPC(8): B01J23/755B01J35/10B82Y30/00B82Y40/00C25B1/04C25B11/06
CPCB01J23/755B82Y30/00B82Y40/00C25B1/04C25B11/04B01J35/33B01J35/61Y02E60/36
Inventor 马炜苗萌馨韩一帆韩桂洪
Owner ZHENGZHOU UNIV
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