CN-116463669-B - Surface modification method of transition metal-based electrolyzed water catalytic material and catalytic material

Abstract

The embodiment of the disclosure discloses a surface modification method of a transition metal-based electrolyzed water catalytic material and the catalytic material. The surface modification method comprises the steps of taking a transition metal-based electrolytic water catalytic material to be modified as a target substrate, immersing the target substrate in a first solution for etching treatment to form an etching morphology on the surface of the target substrate, immersing the etched target substrate in a second solution for modification treatment to grow a layered double hydroxide nano array on the surface of the target substrate, and obtaining the modified transition metal-based electrolytic water catalytic material. By adopting the embodiment of the disclosure, more active sites can be exposed on the surface of the existing transition metal-based water electrolysis catalytic material, and then the electronic structure of the active sites is regulated and controlled by high-valence metal, so that the water electrolysis performance of the transition metal-based water electrolysis catalytic material is improved.

Inventors

• ZHANG YUE
• TIAN ZHEN
• KANG ZHUO
• SUN YU
• WANG XIN
• XIE YONG
• ZHENG WENHAO
• Jiang Zhouyu

Assignees

• 北京科技大学

Dates

Publication Date

20260512

Application Date

20230317

Claims (6)

1. 1. A method for modifying the surface of a transition metal-based electrolyzed water catalytic material, comprising: taking a transition metal-based electrolyzed water catalytic material to be modified as a target substrate; Immersing the target substrate into a first solution for etching treatment, and forming an etching morphology on the surface of the target substrate, wherein the first solution is a mixed solution of nitric acid, sodium hypochlorite solution and water, and the volume ratio of the nitric acid to the sodium hypochlorite solution to the water is 1:1:10-1:1:20; Immersing the etched target substrate into a second solution to carry out modification treatment, and growing a layered double hydroxide nano array on the surface of the target substrate to obtain a modified transition metal-based electrolytic water catalytic material, wherein the second solution contains one or more metal cations different from the target substrate in the following metal cations, namely iron ions, manganese ions, cobalt ions, molybdenum ions and chromium ions; The transition metal-based electrolyzed water catalytic material comprises any one of a nickel-based catalytic material, an iron-based catalytic material, a cobalt-based catalytic material and a titanium-based catalytic material.
2. 2. The surface modification method according to claim 1, wherein the concentration of any one of the metal cations in the second solution is 50 μmol/ml to 100 μmol/ml.
3. 3. The surface modification method according to claim 1, wherein the second solution is a mixed solution of ammonium metatungstate and nitrate, and wherein a molar ratio of the ammonium metatungstate to the nitrate is 1:2-1:15.
4. 4. The surface modification method according to claim 3, wherein a ratio between a sum of amounts of the ammonium metatungstate and the nitrate and an amount of the surfactant is 8:1 to 1:2.
5. 5. The method of claim 4, wherein the surfactant comprises one of Sodium Dodecyl Sulfate (SDS), sodium Dodecyl Benzene Sulfonate (SDBS), and cetyltrimethylammonium bromide (CTAB).
6. 6. The electrolytic water catalytic material is characterized by comprising a transition metal-based electrolytic water catalytic material and a layered double hydroxide nano array with a surface modified by the transition metal-based electrolytic water catalytic material, wherein the electrolytic water catalytic material is prepared by the surface modification method of the transition metal-based electrolytic water catalytic material according to any one of claims 1-5.

Description

Surface modification method of transition metal-based electrolyzed water catalytic material and catalytic material Technical Field The disclosure relates to the technical field of electrolytic water catalytic materials, in particular to a surface modification method of a transition metal-based electrolytic water catalytic material and the electrolytic water catalytic material. Background In order to reduce the energy loss of equipment in energy conversion as much as possible, the development of efficient and excellent catalytic materials for promoting the oxygen evolution reaction process of electrolyzed water, reducing the overpotential of an anode and further reducing the working energy consumption of the whole alkaline electrolytic tank is urgently needed. At present, non-noble metals such as nickel, iron, titanium and the like are widely used as catalytic materials of commercial alkaline electrolytic tanks due to good hydrogen and oxygen evolution activity and impurity resistance of electrolyzed water. However, as the number of surface active sites in the reaction process of the nickel-based, iron-based and titanium-based electrolytic water catalytic material is small, and a large overpotential is required under the condition of high industrial current density, the electrolytic water energy consumption is high, and the commercial production requirement is difficult to meet, so that the utilization efficiency of the nickel-based, iron-based and titanium-based materials is greatly reduced, and further the further development of the nickel-based, iron-based and titanium-based materials in the practical industry is hindered. Therefore, how to develop electrocatalytic materials with high activity, low cost and long-term stable operation under the condition of industrial-grade high current is still a problem to be solved. Disclosure of Invention In view of the above, the embodiment of the disclosure provides a surface modification method of a transition metal-based water electrolysis catalytic material and the water electrolysis catalytic material, which can expose more active sites on the surface of the existing transition metal-based water electrolysis catalytic material, thereby reducing the overpotential of an anode, reducing the reaction energy consumption and meeting the use requirement of the material under the condition of industrial-level high current. In a first aspect, embodiments of the present disclosure provide a surface modification method of a transition metal-based electrolyzed water catalytic material, the surface modification method comprising: taking a transition metal-based electrolyzed water catalytic material to be modified as a target substrate; Immersing a target substrate into a first solution for etching treatment, and forming an etching morphology on the surface of the target substrate; immersing the etched target substrate into a second solution for modification treatment, and growing a layered double hydroxide nano array on the surface of the target substrate to obtain the modified transition metal-based electrolytic water catalytic material. Optionally, the metal-based electrolyzed water catalytic material comprises any one of a nickel-based catalytic material, an iron-based catalytic material, a cobalt-based catalytic material and a titanium-based catalytic material. Optionally, the first solution is a mixed solution of nitric acid, sodium hypochlorite solution and water, wherein the volume ratio of the nitric acid to the sodium hypochlorite solution to the water is 1:1:10-1:1:20. Optionally, the second solution contains one or more metal cations different from the target substrate among iron ions, manganese ions, cobalt ions, molybdenum ions, and chromium ions. Optionally, the concentration of any one metal cation in the second solution is 50 mu mol/ml-100 mu mol/ml. Optionally, the second solution contains metatungstate ions. Optionally, the second solution is a mixed solution of ammonium metatungstate and nitrate, wherein the molar ratio of the ammonium metatungstate to the nitrate is 1:2-1:15. Optionally, the second solution is added with a surfactant, and the ratio of the sum of the amounts of ammonium metatungstate and nitrate to the amount of surfactant is 8:1-1:2. Optionally, the surfactant includes one of Sodium Dodecyl Sulfate (SDS), sodium Dodecyl Benzene Sulfonate (SDBS), and cetyltrimethylammonium bromide (CTAB). In a second aspect, embodiments of the present disclosure provide an electrolyzed water catalytic material comprising a transition metal-based electrolyzed water catalytic material, and a layered double hydroxide nanoarray surface-modified with the transition metal-based electrolyzed water catalytic material, the electrolyzed water catalytic material prepared by the surface modification method of the transition metal-based electrolyzed water catalytic material described above. The embodiment of the disclosure provides a surface modification method of a tra