Preparation method of alkaline electrolytic water hydrogen production catalyst containing rare earth metal elements

Abstract

The invention discloses a preparation method of an alkaline electrolytic water hydrogen production catalyst containing rare earth metal elements. The preparation method comprises the steps of polishing pretreatment of an electrode substrate, preparation of alloy powder, deposition of the alloy powder on the surface of the electrode substrate and the like. Through the mode, according to the preparation method of the alkaline electrolytic water hydrogen production catalyst containing the rare earth metal element, the reaction activity and stability of the catalyst can be enhanced by adding the rare earth metal element La, and a multi-element catalyst structure with a high specific surface area is prepared through a plasma spraying technology; the water electrolysis hydrogen production performance of the catalyst can be improved, the preparation efficiency of the catalyst is improved, and the catalyst is environmentally friendly and low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of alkaline water electrolysis hydrogen production catalysts, and in particular to a method for preparing an alkaline water electrolysis hydrogen production catalyst containing rare earth metal elements. Background Art

[0002] As a clean and efficient energy carrier, hydrogen has received extensive attention in recent years. It has important potential in energy transformation and reducing carbon emissions. Hydrogen can be produced in many ways, among which water electrolysis is a key technology. Water electrolysis uses electricity to decompose water into hydrogen and oxygen. Especially when powered by renewable energy (such as wind and solar energy), this process produces almost no greenhouse gas emissions.

[0003] At present, alkaline water electrolysis is a relatively mature hydrogen production technology in the market, and a variety of alkaline catalyst systems have been developed. Traditional alkaline water electrolysis catalysts usually use porous nickel or nickel foam. However, these catalysts still face some challenges, such as insufficient efficiency, insufficient conductivity, poor corrosion resistance, and insufficient electrochemical stability. With the growth of hydrogen energy demand, improving catalyst performance to improve hydrogen production efficiency and reduce costs has become a research focus. Summary of the invention

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is: Provided is a method for preparing an alkaline water electrolysis hydrogen production catalyst containing a rare earth metal element, the steps comprising: Step (1): cutting the nickel mesh according to preset specifications to form small nickel mesh pieces, using the small nickel mesh pieces as electrode substrates, and performing sandblasting on the surface of the electrode substrates; Step (2): preparing a mixed alloy powder of Ni, Al and La, wherein the weight proportions of the three metals are respectively Ni: 40-80 parts, La: 10-30 parts, and Al: 10-30 parts; Step (3): using a plasma spraying method to deposit the alloy powder prepared in step (2) on the surface of the electrode substrate; Step (4): activating the electrode substrate treated in step (3) with an alkaline solution for 1 to 8 hours to form a multi-catalyst structure on the surface of the electrode substrate, thereby obtaining an electrode for producing hydrogen by alkaline water electrolysis; Step (5): After the electrode is activated in step (4), it is washed with clean water and then dried and stored.

[0005] In a preferred embodiment of the present invention, in step (1), the nickel mesh is cut into circular pieces with a diameter of 1 m.

[0006] In a preferred embodiment of the present invention, in step (4), the alkali solution includes potassium hydroxide solution or sodium hydroxide solution.

[0007] In a preferred embodiment of the present invention, in step (4), the concentration of the potassium hydroxide solution is 10-40%.

[0008] An alkaline water electrolysis hydrogen production catalyst containing rare earth metal elements is prepared by any of the preparation methods described above.

[0009] The beneficial effects of the present invention are as follows: by adding the rare earth metal element La, the reaction activity and stability of the catalyst can be enhanced, and a multi-catalyst structure with a high specific surface area is prepared by plasma spraying technology, which can not only improve the performance of the catalyst in producing hydrogen by electrolysis of water, but also improve the efficiency of catalyst preparation, and is green, environmentally friendly and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which: Figure 1 It is an LSV polarization curve diagram of the preparation method of the alkaline water electrolysis hydrogen production catalyst containing rare earth metal elements of the present invention. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] See also Figure 1 , the embodiment of the present invention includes: A method for preparing an alkaline water electrolysis hydrogen production catalyst containing rare earth metal elements, the steps comprising: Step S1, cutting the nickel mesh according to preset specifications and sizes to form small nickel mesh pieces, and using the small nickel mesh pieces as electrode substrates, and using a sandblasting machine to sandblast the surface of the electrode substrates.

[0013] Step S2, preparing alloy powder containing Ni, Al and La, wherein the weight proportions of the three metals are respectively: Ni: 40-80 parts, La: 10-30 parts, Al: 10-30 parts.

[0014] Step S3: using a plasma spraying method to deposit the alloy powder prepared in step S2 on the surface of the electrode substrate.

[0015] Step S4, using a KOH solution with a concentration of 10-40% to activate the electrode substrate treated in step S3 for 1-8 hours to form a multi-catalyst structure on the surface of the electrode substrate, thereby obtaining an electrode for producing hydrogen by alkaline water electrolysis.

[0016] Step S5: After the electrode activated in step S4 is washed with clean water, it is dried and stored. Example

[0017] First, the nickel mesh was cut into a circular nickel mesh piece with a diameter of 100 cm, and then the surface of the nickel mesh piece was sandblasted and polished with 80 mesh white corundum to complete the pretreatment. The alloy powder with a mass ratio of Ni:Al:La = 70:20:10 was prepared, and the alloy powder was deposited on the surface of the nickel mesh piece by plasma spraying. The obtained nickel mesh piece was activated by a 30% KOH solution for 1 hour, washed with clean water and dried for storage. Example

[0018] First, the nickel mesh was cut into a circular nickel mesh piece with a diameter of 100 cm, and then the surface of the nickel mesh piece was sandblasted and polished with 80 mesh white corundum to complete the pretreatment. The alloy powder with a mass ratio of Ni:Al:La = 40:20:40 was prepared, and the alloy powder was deposited on the surface of the nickel mesh piece by plasma spraying. The obtained nickel mesh piece was activated by a 30% KOH solution for 1 hour, washed with clean water and dried for storage. Example

[0019] First, the nickel mesh was cut into a circular nickel mesh piece with a diameter of 100 cm, and then the surface of the nickel mesh piece was sandblasted and polished with 80 mesh white corundum to complete the pretreatment. The alloy powder with a mass ratio of Ni:Al:La = 70:10:20 was prepared, and the alloy powder was deposited on the surface of the nickel mesh piece by plasma spraying. The obtained nickel mesh piece was activated by a 30% KOH solution for 1 hour, washed with clean water and dried for storage.

[0020] like Figure 1 As shown in the figure, the LSV polarization curves were measured by cutting the nickel wire mesh electrode into a 1cm*1cm square electrode after activation treatment, showing that the LSV curve mainly characterizes the polarization of the catalyst. For the cathode and anode catalysts, the smaller the polarization degree, the smaller the overpotential at the same current density, and thus the less energy loss, and the better the water electrolysis performance. Compared with Raney nickel composed of two elements, Ni and Al, in Examples 1, 2 and 3, the addition of the rare earth metal La effectively improved the catalytic performance of the electrode for water electrolysis to produce hydrogen.

[0021] The beneficial effect of the preparation method of the alkaline water electrolysis hydrogen production catalyst containing rare earth metal elements of the present invention is that by adding the rare earth metal element La, the reaction activity and stability of the catalyst can be enhanced, thereby improving the efficiency of water electrolysis hydrogen production, and the thermal spraying technology can be used to prepare a multi-catalyst structure with a high specific surface area. Compared with the electrodeposition method or the electroplating method, this method is more environmentally friendly and can achieve efficient and low-cost preparation of high-performance multi-catalysts.

[0022] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing an alkaline water electrolysis hydrogen production catalyst containing rare earth metal elements, characterized in that the steps include: Step (1): cutting the nickel mesh according to preset specifications to form small nickel mesh pieces, using the small nickel mesh pieces as electrode substrates, and performing sandblasting on the surface of the electrode substrates; Step (2): preparing a mixed alloy powder of Ni, Al and La, wherein the weight proportions of the three metals are respectively Ni: 40-80 parts, La: 10-30 parts, and Al: 10-30 parts; Step (3): using a plasma spraying method to deposit the alloy powder prepared in step (2) on the surface of the electrode substrate; Step (4): activating the electrode substrate treated in step (3) with an alkaline solution for 1 to 8 hours to form a multi-catalyst structure on the surface of the electrode substrate, thereby obtaining an electrode for producing hydrogen by alkaline water electrolysis; Step (5): After the electrode is activated in step (4), it is washed with clean water and then dried and stored.

2. The method for preparing the alkaline water electrolysis hydrogen production catalyst containing rare earth metal elements according to claim 1, characterized in that: In step (1), the nickel mesh is cut into circular pieces with a diameter of 1 m.

3. The method for preparing the alkaline water electrolysis hydrogen production catalyst containing rare earth metal elements according to claim 1, characterized in that: In step (4), the alkali solution includes potassium hydroxide solution or sodium hydroxide solution.

4. The method for preparing the alkaline water electrolysis hydrogen production catalyst containing rare earth metal elements according to claim 1, characterized in that: In step (4), the concentration of the potassium hydroxide solution is 10-40%.

5. An alkaline water electrolysis hydrogen production catalyst containing rare earth metal elements, characterized in that: Prepared by the preparation method described in any one of claims 1 to 4.

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