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A kind of preparation method of ni/fe/cr based composite material of high efficiency catalyst for oxygen evolution reaction

A technology of catalyst and mixed solution, which is applied in the field of preparation of Ni/Fe/Cr-based composite materials, can solve the problems of high price, scarce reserves, low energy efficiency, etc., and achieve cheap raw materials, simple and efficient preparation methods, and good catalytic performance Effect

Active Publication Date: 2022-03-22
HEZE UNIV
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Problems solved by technology

The process of hydrogen production from water electrolysis involves two half-reactions, oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), however, the practical application of this method is limited by its slow reaction kinetics, resulting in high overpotential and low The energy efficiency, especially for the oxygen evolution reaction, because it involves the transfer process of four proton-coupled electrons, requires a higher overpotential, thus becoming the bottleneck step in the electrolysis of water
The development of an efficient and cheap oxygen evolution reaction catalyst is the key to the industrialization of water electrolysis. RuO 2 and IrO 2 Oxygen evolution reaction catalysts are recognized as having the best performance, but they are expensive and scarce in reserves, and are not suitable for large-scale industrial production. Therefore, it is necessary to develop new catalytic materials with excellent catalytic performance, low price and good stability.

Method used

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  • A kind of preparation method of ni/fe/cr based composite material of high efficiency catalyst for oxygen evolution reaction
  • A kind of preparation method of ni/fe/cr based composite material of high efficiency catalyst for oxygen evolution reaction
  • A kind of preparation method of ni/fe/cr based composite material of high efficiency catalyst for oxygen evolution reaction

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preparation example Construction

[0040] The Ni:Fe mass ratio in the iron-nickel foam used in the preparation method according to the present invention can be in the range of 10:90 to 50:50, more preferably 20:80 to 40:60, most preferably 30: 70. When the Ni:Fe mass ratio is less than 10:90, that is, the Ni content is very small, or when the Ni:Fe mass ratio is greater than 50:50, that is, the Ni content ratio is large, and the catalytic performance of the product is not good. The possible reason is that when the Ni content is very small, it may be difficult to form the active ingredient Ni 3 S 2 and NiCr 2 o 4 , chromium may be more based on Cr 2 S 3 The form exists, and does not form a good recombination with Fe atoms, resulting in insignificant performance improvement. If the proportion of Ni content is large, it may cause more chromium to be Cr 2 o 3 The existence of the form, also leads to the compound effect is not significant, and then leads to the performance improvement is not obvious.

[004...

Embodiment 1

[0044] 1) Foamed iron-nickel (1cm×1.5cm, Ni:Fe mass ratio is 30:70) was cleaned with a mixed solution of absolute ethanol and acetone with a volume ratio of 1:1, and ultrasonic cleaning in 1M HCl for 15 minutes, and then washed with Rinse several times with deionized water;

[0045] 2) Dissolve 0.05 mmol of chromium nitrate nonahydrate and 0.05 mmol of thiourea in 15 mL of deionized water, and magnetically stir for 10 minutes to obtain a clear solution;

[0046] 3) Then, the iron-nickel foam cleaned in step 1) was immersed in the clarified solution obtained in step 2), and transferred to a 20 mL stainless steel autoclave lined with PTFE, and reacted at 160 °C for 3 h. After it was naturally cooled to room temperature, the obtained foamed iron-nickel composite material was taken out, washed gently with deionized water several times, and dried in a vacuum oven at 60°C for 2 hours.

[0047] figure 1 The XPS diagram of the Ni / Fe / Cr-based composite material prepared for this exam...

Embodiment 2

[0050] The catalyst material was prepared in the same manner as in Example 1 except that 0.025 mmol of chromium nitrate nonahydrate and 0.5 mmol of thiourea were used as reactants.

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Abstract

The invention discloses a preparation method of a catalyst based on Ni / Fe / Cr three metal elements. The method comprises: 1) cleaning the foamed iron-nickel and drying it for later use; 2) dissolving chromium salt and thiourea in deionized water and stirring to obtain a clear solution; 3) immersing the cleaned iron-nickel foam in step 1) into the clear solution obtained in step 2), and reacting hydrothermally at 140 to 180° C. for 2 to 6 hours, then washing and drying, The catalyst based on three metal elements of Ni / Fe / Cr is obtained. The preparation method is simple and efficient, the raw material is cheap, and is suitable for large-scale industrial production. The catalyst prepared at the same time has good catalytic performance.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a method for preparing a Ni / Fe / Cr-based composite material used in electrolyzing water to produce hydrogen. Background technique [0002] The rapid depletion of fossil fuels and the severe environmental pollution have made it crucial to find renewable alternative energy sources. As a clean, renewable, high-energy-density energy source, hydrogen is considered the most promising alternative to fossil fuels. Among the many hydrogen production methods, electrochemical water splitting is a promising method because of its low energy consumption, environmental friendliness, high purity, and more importantly, its easy integration with tides, electricity, wind and solar energy. combined with renewable energy. The process of hydrogen production from water electrolysis involves two half-reactions, oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), however, the practical applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04
CPCC25B1/04Y02E60/36
Inventor 李红英王学亮汪涛
Owner HEZE UNIV
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