CN-121976226-A - Electrolytic tank

CN121976226ACN 121976226 ACN121976226 ACN 121976226ACN-121976226-A

Abstract

The invention discloses an electrolytic cell, which comprises an electrode plate, wherein the electrode plate comprises a substrate, a catalyst is supported on the substrate, the catalyst is nickel-iron-based multi-element alloy and has an ordered nanowire or nano-chain microstructure, the diameter of the nanowire/chain is 0.1-2.0 mu m, the length of the nanowire/chain is 0.1-200 mu m, the catalyst comprises the following components in percentage by mass, 85% -95% of Ni,4.98% -14.98% of Fe, and the balance of noble metal or transition metal.

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: 20260505
Application Date: 20221231

Claims (7)

1. The electrolytic cell is characterized by comprising an electrode plate, wherein the electrode plate comprises a substrate, a catalyst is supported on the substrate, the catalyst is a nickel-iron-based multi-component alloy and has an ordered nanowire or nano-chain microstructure, 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, the catalyst comprises the following components in percentage by mass; the noble metal is selected from platinum and/or ruthenium; the preparation method of the catalyst comprises the following steps: 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); And placing the electrode slice substrate in a container, adding electrodeposition liquid, and performing electrodeposition.
2. The electrolytic cell 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 honeycomb nanowires assembled from nickel-iron nanoplates based on the framework portion, and the length of the nanowires is 0.1-100 μm.
3. The electrolyzer of claim 1 characterized in that the catalyst obtained is yellowish green.
4. The electrolytic cell of claim 1, wherein the substrate is any one of nickel foam, nickel mesh, and carbon cloth.
5. The electrolytic cell according to 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. The electrolytic cell according to claim 1, wherein the catalyst supported on the substrate is in a grid form.
7. The electrolytic cell according to claim 6, wherein the mesh size of the mesh-like catalyst supported on the substrate is 5 to 12cm.

Description

Electrolytic tank 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 an electrolytic tank. 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 aims to provide an electrolytic cell for solving the problems of low catalytic activity, high energy consumption, poor stability and the like of an alkaline electrolyzed water oxygen production catalyst in the prior art. In order to achieve the above and other related objects, a first aspect of the present invention provides an electrolytic cell, including an electrode sheet, the electrode sheet including a substrate, on which a catalyst is supported, the catalyst being a nickel-iron-based multi-element alloy, having an ordered nanowire or nano-chain microstructure, the nanowire or nano-chain having a diameter of 0.1 to 2.0 μm and a length of 0.1 to 200 μm, the catalyst including, by mass, 85 to 95% ni,4.98 to 14.98% fe, and the balance being a noble metal; the noble metal is selected from platinum and/or ruthenium; the preparation method of the catalyst comprises the following steps: 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