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Preparation method of carbon nanotube cladded selenium-based catalyst for electrolyzing water to produce hydrogen

A carbon nanotube and catalyst technology, which is applied in the field of preparation of carbon nanotube-coated selenium-based catalysts for electrolysis of water to produce hydrogen, can solve the problems of ineffective protection of catalyst structure stability, catalyst deactivation, etc., and achieve large material transfer surface , The preparation process is simple, and the effect of improving stability

Inactive Publication Date: 2018-09-04
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the fact that metal selenides are easily corroded in strong acidic and alkaline electrolytes and lead to catalyst deactivation, and the existing solutions cannot effectively protect the structural stability of catalysts under strong acid and alkali conditions, the present invention proposes an electrolytic A method for preparing selenium-based catalysts coated with carbon nanotubes for hydrogen production from water, thereby effectively preventing the catalyst from being corroded in the electrolyte and improving the stability of the material

Method used

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  • Preparation method of carbon nanotube cladded selenium-based catalyst for electrolyzing water to produce hydrogen
  • Preparation method of carbon nanotube cladded selenium-based catalyst for electrolyzing water to produce hydrogen
  • Preparation method of carbon nanotube cladded selenium-based catalyst for electrolyzing water to produce hydrogen

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Embodiment 1

[0032](1) Weigh selenium dioxide and nickel nitrate according to the molar ratio of 2.5:1, add them to the mixed solution of deionized water and N,N dimethylformamide with a volume ratio of 1:2, stir well, and then place Heated at 185°C for 10 hours to obtain a nickel selenide nanowire material with a length of 200nm and a wire diameter of 3nm;

[0033] (2) Add the nickel selenide nanowires into the diethylene glycol aqueous solution with a pH of 10, control the pressure of the autoclave at 0.5 MPa, carry out carburizing reaction at 300°C for 5 hours in the autoclave, and cool naturally to room temperature , after filtering, the pretreated material is obtained;

[0034] (3) Wash and dry the pretreated material with anhydrous ethanol, protect it with inert gas argon, and sinter it in a muffle furnace for 2 hours at a temperature of 500°C, soak it in hydrofluoric acid with a concentration of 10% for 12 hours Afterwards, rinse and dry with deionized water, and finally heat-treat...

Embodiment 2

[0037] (1) Weigh selenium dioxide and cobalt sulfate according to the molar ratio of 2.2:1, add them to the mixed solution of deionized water and N,N dimethylformamide with a volume ratio of 1:2, stir well, and then place Heated at 179°C for 13 hours to obtain a cobalt selenide nanowire material with a length of 1000nm and a wire diameter of 15nm;

[0038] (2) Add the cobalt selenide nanowires into the diethylene glycol aqueous solution with a pH of 10, control the pressure of the autoclave at 1.2MPa, carry out carburizing reaction at 280°C for 5h in the autoclave, and cool naturally to room temperature , after filtering, the pretreated material is obtained;

[0039] (3) The pretreated material was washed and dried with absolute ethanol, protected with nitrogen, and sintered in a muffle furnace for 2 hours at a sintering temperature of 500°C. Rinse with ionized water, wash and dry, and finally heat-treat at 800°C for 2 hours to obtain a cobalt selenide catalyst with a composi...

Embodiment 3

[0042] (1) Weigh selenium dioxide and ferric chloride according to the molar ratio of 2:1, add them to the mixed solution of deionized water and N,N dimethylformamide with a volume ratio of 1:2, stir evenly, and then Heat at 178°C for 12 hours to obtain iron selenide nanowire materials with a length of 1000nm and a wire diameter of 6nm;

[0043] (2) Add iron selenide nanowires into diethylene glycol aqueous solution with a pH of 9, control the pressure of the autoclave at 0.9MPa, and carry out carburizing reaction at 240°C for 4.1h in the autoclave, and cool naturally to room temperature. After filtering, the pretreated material is obtained;

[0044] (3) Wash and dry the pretreated material with absolute ethanol, protect it with inert gas argon, and sinter in a muffle furnace for 2 hours at a sintering temperature of 500°C, using hydrofluoric acid with a concentration of 10-15% After soaking for 12 hours, wash and dry with deionized water, and finally heat-treat at 800°C for ...

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Abstract

The invention provides a preparation method of a carbon nanotube cladded selenium-based catalyst for electrolyzing water to produce hydrogen. According to the preparation method, selenium dioxide is used as a selenium source and N,N-dimethylformamide is used as a complexing agent and a reducing agent; transition metal salt is added to react, so as to obtain a transition metal selenide nano-wire active substance; then a carbon nanotube layer is prepared and is used for carrying out surface cladding on the active substance, so that the inner part of a carbon nanotube is uniformly covered with the active substance; corrosion, caused by a strong-acidity or strong-alkalinity electrolyte solution, on the catalyst is avoided, the stability of a catalytic material is improved and the problem thata traditional catalyst is easily corroded by electrolyte is solved. Furthermore, the carbon nanotube layer is used for carrying out the surface cladding on the active substance, so that the charge transport capability in an electro-catalysis process is improved; meanwhile, a transition metal selenide nano-wire aggregation effect can be effectively prevented, and a larger substance transport surface and a catalytic active point are provided for electro-catalytic hydrogen evolution reaction.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by electrolysis of water, in particular to a preparation method of a carbon nanotube-coated selenium-based catalyst for hydrogen production by electrolysis of water. Background technique [0002] In order to reduce the consumption of fossil energy and solve the problem of environmental pollution, it is urgent to develop clean and renewable energy. Although solar energy, wind energy, tidal energy and geothermal energy have the characteristics of large reserves as clean energy, they have shortcomings such as intermittent and unstable. Hydrogen energy has the advantages of high combustion calorific value, which is about three times that of gasoline, the combustion product is water, clean and environmentally friendly, and the preparation method is simple. Hydrogen production by electrolysis of water can effectively convert excess electrical energy into hydrogen energy and store it. Compa...

Claims

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Application Information

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IPC IPC(8): B01J27/057C25B11/06C25B1/04
CPCB01J27/0573C25B1/04C25B11/057C25B11/073Y02E60/36
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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