CN-121992435-A - Preparation method of electrode plate

Abstract

The invention discloses a preparation method of an electrode slice, which comprises the steps of pretreating a substrate, preparing an agent A and an agent B, placing the pretreated substrate in a container, wherein the container comprises a liquid storage box and a grid-shaped die, sequentially adding the agent B and the agent A, heating to prepare an electrode slice substrate, preparing electrodeposition liquid, placing the electrode slice substrate in the container, adding the electrodeposition liquid, and enabling the surface of the electrode slice to be yellow-green, have grid-shaped appearance with uniform distribution, and have the advantages of high catalytic activity, low energy consumption and the like when being applied to hydrogen production by electrolysis of water.

Inventors

• ZHANG JIAJIA
• Request for anonymity
• XU SHUAI
• WANG XIAOMENG
• HUANG MIN
• Request for anonymity
• ZHOU ZHENSHENG

Assignees

• 苏州莒纳新材料科技有限公司
• 上海莒纳新材料科技有限公司
• 成都莒纳新材料科技有限公司

Dates

Publication Date

20260508

Application Date

20221231

Claims (6)

1. 1. A method for producing an electrode sheet, comprising: Pretreating a substrate; Preparing an A medicament and a B medicament, wherein the A medicament comprises soluble nickel salt, soluble noble metal salt, soluble sodium salt and soluble alkali, the molar concentration ratio of the soluble nickel salt to the soluble noble metal salt to the soluble sodium salt to the soluble alkali in the A medicament is (1.5-3.0) (0.001-0.02) (1.2-1.9) (0.04-0.09), and the B medicament comprises hydrazine hydrate and the soluble alkali, and the molar concentration ratio of the hydrazine hydrate to the soluble alkali in the B medicament is (1.2-1.9) (0.01); placing the pretreated base material into a container, sequentially adding the agent B and the agent A, and heating to obtain an electrode slice substrate; preparing electrodeposition liquid which comprises soluble nickel salt and soluble ferrous salt, wherein the molar concentration ratio of the soluble nickel salt to the soluble ferrous salt in the electrodeposition liquid is (0.6-1) (0.01-0.1); Placing the electrode plate substrate in a container, adding electrodeposition liquid, and performing electrodeposition; The catalyst is a nickel-iron-based multi-element alloy and has an ordered nanowire or nano-chain microstructure, wherein the diameter of the nanowire or nano-chain is 0.1-2.0 mu m, the length of the nanowire or nano-chain is 0.1-200 mu m, and the catalyst comprises the following components in percentage by mass; the noble metal is selected from platinum and/or ruthenium; The container comprises a liquid storage box and a latticed mold, wherein the base material is firstly put in the liquid storage box horizontally, then the latticed mold is put on the base material, then the B/A medicament is added, the latticed catalyst is formed on the surface of the base plate, and the latticed mold is made of acid and alkali resistant plastics.
2. 2. The method of claim 1, wherein the microscopic morphological features of the catalyst comprise nanowires vertically grown on a substrate with a wire diameter of 0.1-1.2 μm, the nanowires comprise a first portion and a second portion, the first portion is a framework portion, the framework portion comprises nickel-platinum nanowires formed by "stacking" nanoparticles with a diameter of 0.1-0.6 μm, and the second portion comprises cellular nanowires assembled from nickel-iron nanoplatelets based on the framework portion, and the length of the cellular nanowires is 0.1-100 μm.
3. 3. The method of claim 1, wherein the catalyst is yellowish green.
4. 4. The method of claim 1, wherein the substrate is any one of nickel foam, nickel mesh, and carbon cloth.
5. 5. The method of claim 1, wherein the electrode sheet is square or round; and/or the area of the base material is more than or equal to 0.5m 2 .
6. 6. The method of claim 1, wherein the mesh size of the mesh-like catalyst supported on the substrate is 5 to 12cm.

Description

Preparation method of electrode plate Technical Field The invention relates to the technical field of hydrogen production by water electrolysis, in particular to the technical field of catalysts for oxygen production by water electrolysis, and particularly relates to a preparation method of an electrode plate. Background Currently, humans are facing serious energy problems and environmental challenges, including increased demand for energy resources from an increase in the global population, global warming and climate change, and serious industrial pollution. In view of the above problems, people have begun to focus their attention on the development and utilization of clean renewable energy sources, such as wind power generation, hydroelectric generation, solar energy. Although these energy sources can be environmentally friendly and renewable, the practical use of these energy sources is limited by various conditions, such as seasons, climates, etc., so that these energy sources often have difficulty meeting the requirements of people for stable energy supply. Compared with the combustion of carbon elements in organic fossil fuels to generate a large amount of greenhouse gases, hydrogen is considered as the most promising energy carrier, the combustion product is only water, and the energy density can reach more than three times that of gasoline. The conversion between water and hydrogen energy can be realized to a great extent, and the energy crisis and the environmental pollution problem can be solved at the same time. In the preparation mode of hydrogen, the electrochemical water decomposition can realize stable and green conversion from electric energy to chemical energy, and the process can help people to better utilize intermittent energy sources such as wind power, water power and the like, so that the method has a great research interest. Only 4% of the total current hydrogen output comes from green hydrogen produced by decomposing water, wherein the main reason is that the lower hydrogen energy conversion efficiency severely restricts the industrial process of hydrogen production by electrolysis of water, and in addition, noble metal electrocatalysts are usually required to reduce the activation energy barrier involved in water decomposition in practical electrolysis. Therefore, the development cost is low, the crust abundance is high, and the hydrogen evolution activity is high. The hydrogen evolution catalyst of the alkaline solution electrolyzer which is put into use in industry so far is generally nickel screen plating (Raney nickel), the performance is poor, the current density of the cell voltage is generally 2000-4000A/m 2 under 2V, the energy consumption of water electrolysis equipment is higher, and the direct current energy consumption of the electrolyzer is generally more than 4.5kWh/Nm 3 H2. Therefore, if a hydrogen evolution catalyst which has low energy consumption and high performance and is suitable for large-scale water electrolysis equipment can be developed, the realization of larger-scale economic green oxygen production can be striven for early. Disclosure of Invention In view of the above drawbacks of the prior art, the present invention is directed to a method for preparing an electrode sheet, which is used for solving the problems of low catalytic activity, high energy consumption, poor stability and the like of an alkaline electrolyzed water oxygen-generating catalyst in the prior art. To achieve the above and other related objects, the present invention provides a method for manufacturing an electrode sheet The catalyst is a nickel-iron-based multielement alloy, and has an ordered nanowire or nano-chain microstructure, wherein the diameter of the nanowire or nano-chain is 0.1-2.0 mu m, the length of the nanowire or nano-chain is 0.1-200 mu m, and the catalyst comprises the following components in percentage by mass of 85% -95% of Ni,4.98% -14.98% of Fe and the balance of noble metal or transition metal. Optionally, the noble metal or transition metal is selected from at least one of platinum, ruthenium, molybdenum. Optionally, the micro-morphology feature of the obtained catalyst comprises that the nanowire is vertically grown on a substrate, the wire diameter is 0.1-1.2 mu m, the nanowire comprises a first part and a second part, the first part is a framework part, the framework part comprises nickel platinum nanowires formed by 'stacking' nano particles, the length is 0.1-0.6 mu m, and the second part comprises honeycomb nanowires assembled by nickel iron nano sheets based on the framework part, and the length is 0.1-100 mu m. Alternatively, the resulting catalyst is yellow-green. In a second aspect, the invention provides an electrolytic water oxygen production electrode plate, which comprises a substrate, wherein the substrate is loaded with the electrolytic water hydrogen production catalyst according to the first aspect, and nanowires or nanochains are orderly dist