CN114941154A

CN114941154A - Alkaline water electrolytic tank partition electrode and preparation method thereof

Info

Publication number: CN114941154A
Application number: CN202210472949.6A
Authority: CN
Inventors: 金黎明; 张存满; 吕洪; 耿振
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-08-26
Anticipated expiration: 2042-04-29
Also published as: CN114941154B

Abstract

The invention relates to a partitioned electrode of an alkaline water electrolytic cell and a preparation method thereof, wherein the electrode comprises an electrode matrix with uniform partitions and an electrode binding post arranged on the electrode matrix; the electrode substrate is loaded with a catalyst layer prepared by regulating and controlling an electrodeposition process through an electrode wiring terminal. Compared with the prior art, the electrode partition and electrode binding post design can accurately regulate and control the resistance characteristics of different positions, so that the deposition characteristic of the catalyst is optimized, and compared with a single binding post electrode without partition, the uniformity of the obtained high-performance electrode surface catalyst is higher.

Description

Alkaline water electrolytic tank partition electrode and preparation method thereof

Technical Field

The invention relates to the technical field of alkaline water electrolysis hydrogen production, in particular to an alkaline water electrolysis cell partitioned electrode and a preparation method thereof.

Background

The major categories of new energy sources are mainly solar energy, nuclear energy, hydrogen energy, wind energy and the like, wherein the hydrogen energy is used as a product without any secondary pollution, and the cleanest energy source is expected to become one of the main energy sources in the future. Around the national 'carbon peak reaching and carbon neutralization' target, the development of hydrogen energy technical research meets the national major strategic requirements. The hydrogen production by water electrolysis is one of the most common hydrogen production technologies at present, wherein the alkaline water electrolysis hydrogen production technology is relatively mature and has been commercialized, and with the continuous increase of market demand, the size and the productivity of an alkaline water electrolytic cell are continuously increased, the diameter of a single electrolytic cell in the future exceeds 2m, and the productivity exceeds 1500Nm 3/h.

The electrode is a core component of the electrolytic cell, the increase of the size and the productivity puts higher requirements on the electrode, the electrode area needs to be increased on the basis of the existing nickel mesh electrode, a high-performance catalyst is loaded, and the difficulty of uniformly loading the catalyst is increased due to the large-scale electrode.

Disclosure of Invention

The invention aims to overcome the defect of poor uniformity of a large-area electrode supported catalyst in the prior art and provide a partitioned electrode of an alkaline water electrolytic cell and a preparation method thereof.

The purpose of the invention can be realized by the following technical scheme:

according to a first aspect of the invention there is provided an alkaline water electrolyser zoned electrode comprising a uniformly zoned electrode substrate and an electrode lug mounted on the electrode substrate; the electrode substrate is loaded with a catalyst layer prepared by regulating and controlling an electrodeposition process through an electrode wiring terminal.

Preferably, the electrode substrate is an electrode substrate with uniform longitudinal partition, uniform transverse partition, uniform block partition or uniform annular partition.

Preferably, each section of the electrode base body is connected with at least one electrode binding post.

Preferably, the number of the electrode posts installed on each section of the electrode base is the same.

Preferably, the electrode posts are vertically mounted on partition lines inside the electrode base.

Preferably, the electrode substrate is a nickel mesh, iron mesh or alloy mesh woven body.

Preferably, the catalyst in the catalyst layer is a nickel-based, iron-based alloy catalyst.

Preferably, the electrode substrate is a circular electrode substrate or a square electrode substrate.

Preferably, the electrode substrate is a circular electrode substrate; the diameter of the circular electrode substrate is more than or equal to 2 meters.

According to a second aspect of the present invention, there is provided a process for the preparation of a divided electrode for an alkaline water electrolyser as described above, which process comprises the steps of:

step S1, evenly dividing the electrode substrate into regions based on shape and requirement, and mounting an electrode binding post on each region;

and step S2, soaking the partition electrode in the electrodeposition solution to obtain the partition electrode of the alkaline water electrolytic tank with uniformly distributed catalyst.

Compared with the prior art, the invention has the following advantages:

1) the large-area electrode has the defect of poor uniformity of the catalyst loaded, and the resistance characteristics of different positions can be accurately regulated and controlled by the design of the subareas and the binding posts of the large-area electrode, so that the deposition characteristic of the catalyst is optimized, and compared with a single binding post electrode without subareas, the uniformity of the catalyst on the surface of the obtained high-performance electrode is higher;

2) the method for partitioning different electrodes is suitable for electrode substrates in different shapes, and can partition according to actual requirements;

3) the number of the electrode binding posts arranged on each subarea can be set according to actual conditions, so that the applicability is higher;

4) the electrode matrix adopted by the invention is a nickel net, iron net or alloy net woven body, so that the electrolysis efficiency is higher.

Drawings

FIG. 1 is a schematic view of an undivided single terminal post;

FIG. 2 is a schematic view of a longitudinal segmented single terminal post;

FIG. 3 is a schematic view of a longitudinal partitioned multiple terminal block;

FIG. 4 is a schematic view of a laterally sectioned single terminal post;

FIG. 5 is a schematic view of a ring segment single terminal post;

FIG. 6 is a schematic view of a ring segment multiple terminal;

the electrode comprises an electrode base body 1, an electrode binding post 2, a longitudinal partition line 3, a transverse partition line 4 and a ring partition line 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

Example 1

The embodiment provides an alkaline water electrolytic cell partition electrode, which comprises an electrode matrix 1 with uniform partition and an electrode binding post 2 arranged on the electrode matrix 1; the electrode substrate 1 is loaded with a catalyst layer prepared by regulating and controlling an electrodeposition process through an electrode terminal 2.

The electrode matrix 1 is an electrode matrix which is uniformly divided into longitudinal partitions, transverse partitions, blocks or annular partitions; wherein, each subregion is connected with an electrode post 2 at least and the electrode post 2 quantity that connects in each subregion is the same. The electrode post 2 is vertically installed on a divisional line inside the electrode base 1. The electrode substrate 1 is a nickel net, an iron net or an alloy net woven body. The catalyst in the catalyst layer includes, but is not limited to, nickel-based, iron-based alloy catalysts. The shape of the electrode substrate 1 includes, but is not limited to, circular, square, or other geometric shapes.

Next, an embodiment of the method of the present invention, a method for preparing a partitioned electrode for an alkaline water electrolytic cell as described above, comprises the steps of:

step S1, evenly dividing the electrode substrate 1 into regions based on shape and requirement, and mounting an electrode binding post 2 on each region; wherein, the partition method includes but is not limited to vertical partition, horizontal partition, block partition and annular partition;

Example 2

As shown in figure 2, a circular nickel screen braid with the diameter of 2 meters is used as an electrode substrate 1, the nickel screen braid is evenly divided into 4 areas in the longitudinal direction, current input terminals are arranged on the same side of the nickel screen, only one terminal is arranged in each subarea, and a catalyst is electrodeposited through the longitudinal subareas, so that the distance from the current to each site is shortened and the reaction characteristic of each site is improved compared with the non-subarea in figure 1. And immersing the electrode in the mixed electrodeposition liquid containing nickel and iron to obtain the high-performance electrode with uniformly distributed catalyst.

Example 3

As shown in figure 3, a circular nickel mesh woven body with the diameter of 2 meters is used as an electrode substrate 1, the circular nickel mesh woven body is divided into 4 areas in the longitudinal direction, current input binding posts are arranged on two sides of the nickel mesh, only two binding posts are arranged in each subarea, and a catalyst is electrodeposited through the longitudinal subareas, so that the distance from the current to each site is shortened and the reaction characteristic of each site is improved compared with the non-subarea shown in figure 1. And immersing the electrode in the mixed electrodeposition liquid containing nickel and iron to obtain the high-performance electrode with uniformly distributed catalyst.

Example 4

As shown in FIG. 4, a circular nickel mesh braid having a diameter of 2m was used as an electrode substrate 1, which was divided into 4 regions in the transverse direction, and current input terminals were installed perpendicularly to divisional lines, one terminal being installed per divisional line, and a catalyst was electrodeposited by divisional in the transverse direction, whereby the distance from the current to each site was shortened as compared with the non-divisional line of FIG. 1, and the reaction characteristics of each site were improved. And immersing the electrode in the mixed electrodeposition liquid containing nickel and iron to obtain the high-performance electrode with uniformly distributed catalyst.

Example 5

As shown in fig. 5, a circular nickel mesh braid having a diameter of 2m is used as an electrode substrate 1, the electrode substrate is equally divided into 5 regions outward based on the center of a circle, current input terminals are installed perpendicular to partition lines, one terminal is installed per partition line, and a catalyst is electrodeposited by annular partition, so that the distance from the current to each site is shortened as compared with the case where the catalyst is not partitioned in fig. 1, and the reaction characteristics of each site are improved. And immersing the electrode in the mixed electrodeposition liquid containing nickel and iron to obtain the high-performance electrode with uniformly distributed catalyst.

Example 6

As shown in fig. 6, a circular nickel mesh braid having a diameter of 2m is used as an electrode substrate 1, the electrode substrate is equally divided into 5 regions outward based on the center of a circle, current input terminals are installed perpendicular to partition lines, four terminals are installed per partition line, and a catalyst is electrodeposited by annular partition, so that the distance from the current to each site is shortened as compared with that of the catalyst which is not partitioned in fig. 1, and the reaction characteristics of each site are improved. And immersing the electrode in the mixed electrodeposition liquid containing nickel and iron to obtain the high-performance electrode with uniformly distributed catalyst.

Example 7

The diameter of the circular electrode base was 2m or more, and the other settings were the same as in example 1.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The partitioned electrode of the alkaline water electrolytic cell is characterized by comprising an electrode base body (1) which is uniformly partitioned and an electrode binding post (2) which is arranged on the electrode base body (1); the electrode substrate (1) is loaded with a catalyst layer prepared by regulating and controlling an electrodeposition process through an electrode binding post (2).

2. An alkaline water electrolyser segmented electrode according to claim 1 characterized in that said electrode matrix (1) is a uniform longitudinal segmented, uniform transverse segmented, uniform block segmented or uniform ring segmented electrode matrix.

3. An electrolysis cell divided electrode according to claim 1, characterised in that each division of the electrode base body (1) is provided with at least one electrode terminal (2).

4. An electrolysis cell divided electrode according to claim 3, characterised in that the number of electrode studs (2) per division of the electrode base body (1) is the same.

5. A divided electrode for an alkaline water electrolyser in accordance with claim 1 characterized in that the electrode terminals (2) are mounted vertically on a dividing line inside the electrode base (1).

6. An alkaline water electrolyser sectional electrode as claimed in claim 1, characterized in that said electrode substrate (1) is a woven body of nickel mesh, iron mesh or alloy mesh.

7. The divided electrode of an alkaline water electrolyzer of claim 1 characterized in that the catalyst in the catalyst layer is a nickel-based, iron-based alloy catalyst.

8. The electrodes of claim 1, characterized in that the electrode matrix (1) is a circular electrode matrix or a square electrode matrix.

9. An alkaline water electrolyser sectional electrode according to claim 8 characterized in that said electrode matrix (1) is a circular electrode matrix; the diameter of the circular electrode substrate is more than or equal to 2 meters.

10. A method for the preparation of the split electrodes of an alkaline water electrolyser as claimed in claim 1, characterized in that it comprises the following steps:

step S1, evenly dividing the electrode substrate (1) into sections based on shape and requirement, and mounting an electrode binding post (2) on each section;