nife-ldh@cos x /nf composite material and its preparation method and application

A composite material and reaction mixture technology, applied in electrolysis components, electrodes, electrolysis process, etc., can solve the problems of high price of water splitting reaction catalysts, only have HER or OER catalytic activity, etc., to increase catalytic active sites, excellent OER and HER performance, low cost effect

Active Publication Date: 2022-02-15
BEIJING NORMAL UNIVERSITY +1
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  • Claims
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Problems solved by technology

[0004] In view of the above problems in the prior art, the purpose of this application is to provide a NiFe-LDH@CoS x / NF composite material and its preparation method are used to solve the problem that the water splitting reaction catalyst is expensive and only has HER or OER catalytic activity

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  • nife-ldh@cos <sub>x</sub> /nf composite material and its preparation method and application
  • nife-ldh@cos <sub>x</sub> /nf composite material and its preparation method and application
  • nife-ldh@cos <sub>x</sub> /nf composite material and its preparation method and application

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preparation example Construction

[0034] The first aspect of the present application provides a NiFe-LDH@CoS x The preparation method of / NF composite material, it comprises the steps:

[0035] (1) adding iron source and urea to deionized water, stirring to obtain the first reaction mixture;

[0036] Wherein, the molar ratio of the iron source to the urea is 1: (3-7), and the molar ratio of the iron source to the deionized water is 1: (16-20) mol / L;

[0037] (2) hydrothermally reacting the first reaction mixture with nickel foam (NF) at 80-120°C for 6-10 hours, after the reaction is completed, wash with distilled water and absolute ethanol, and dry to obtain NiFe-LDH / NF composite materials;

[0038] (3) dissolving the cobalt source and the sulfur source in deionized water to obtain a second reaction mixture;

[0039] Wherein, the molar ratio of the cobalt source to the sulfur source is 1: (90-110), and the molar ratio of the sulfur source to the deionized water is (0.5-3.5): 1mol / L;

[0040] (4) Immerse the...

Embodiment 1

[0057]

[0058] Weigh 0.808g (2mmol) iron nitrate (Fe(NO 3 ) 3 9H 2 O), 0.601g (10mmol) urea was stirred in 36ml deionized water to form a transparent and uniform yellow solution. The solution and the pretreated NF (2cm×3cm) were transferred to a stainless steel autoclave with a polytetrafluoroethylene liner of 50ml, sealed, and reacted in an oven at 100°C for 8h. After the reaction was completed, it was washed with distilled water and absolute ethanol, and dried to obtain NiFe-LDH / NF grown on NF.

[0059] The pretreatment process of NF is as follows: cutting NF into 2cm×3cm sheets, soaking in 5% hydrochloric acid solution for 20-30min, and then ultrasonically cleaning with acetone, deionized water and ethanol for 10-15min respectively.

[0060]

[0061] Weigh 0.58g (2mmol) cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), 15.2g (200mmol) thiourea, be dissolved in 100ml deionized water, form the Co that concentration is 20mmol / L 2+ solution.

[0062] After cutting the prepared...

Embodiment 2

[0064] Except that iron source is ferric chloride, all the other are identical with embodiment 1.

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Abstract

This application provides the NiFe‑LDH@CoS x / NF composite material and its preparation method and application, the preparation method comprises: adding iron source and urea to deionized water, stirring to obtain the first reaction mixture; mixing the first reaction mixture with foamed nickel (NF) at 80-120°C Under hydrothermal reaction for 6-10 hours, the NiFe-LDH / NF composite material is obtained; the cobalt source and the sulfur source are dissolved in deionized water to obtain a second reaction mixture; the NiFe-LDH / NF composite material is immersed in the second reaction mixture, NiFe‑LDH@CoS was obtained by electrochemical deposition x / NF composites. NiFe‑LDH@CoS prepared by the above method x The / NF composite possesses excellent OER and HER properties simultaneously, and can be used as a bifunctional catalyst for total water splitting.

Description

technical field [0001] This application relates to the technical field of catalyst preparation for water splitting reaction, especially NiFe-LDH@CoS x / NF composite materials and their preparation methods and applications. Background technique [0002] With the consumption of fossil fuels and the resulting environmental pollution, finding alternative energy sources has become a severe challenge for society today. To solve these problems, the utilization and storage of renewable energy has received more and more attention. Electrolysis of water produces hydrogen and oxygen, and stores electrical energy in large quantities in chemical bonds efficiently. While solving the problem of difficult storage of electrical energy, it also obtains hydrogen energy with zero pollution, high calorific value and recyclable use. It is an efficient preparation of clean , Sustainable energy technologies. However, the occurrence of the two half-reactions of the water splitting reaction, the h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/091C25B11/061C25B11/054
CPCC25B1/04Y02E60/36
Inventor 马淑兰杨燕姚惠琴谢雨晨
Owner BEIJING NORMAL UNIVERSITY
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