CN214782173U

CN214782173U - Composite electrode for catalyzing water decomposition to produce oxygen

Info

Publication number: CN214782173U
Application number: CN202023097542.5U
Authority: CN
Inventors: 章潇慧; 顾佳俊; 刘庆雷; 袁洋
Original assignee: CRRC Academy Co Ltd
Current assignee: CRRC Industry Institute Co Ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-11-19
Anticipated expiration: 2030-12-21

Abstract

The utility model discloses a combined electrode for catalyzing decomposition of water to produce oxygen, combined electrode comprises the crisscross functional fiber who weaves of stranded, the functional fiber is the cladding structure, by the fibre body and cladding in proper order the conducting layer and the catalytic material layer of fibre body surface constitute. The utility model provides a combined electrode for catalyzing water decomposition to produce oxygen, this combined electrode have bigger specific surface area, more catalytic activity sites and lower impedance for this electrode has excellent electric conductivity and electro-catalytic activity simultaneously, has wide application prospect in electrolysis aquatic oxygen field.

Description

Composite electrode for catalyzing water decomposition to produce oxygen

Technical Field

The utility model relates to an electrochemistry catalytic material field especially relates to a combined electrode for catalyzing water decomposition to produce oxygen.

Background

With the development of society, people's demand for energy is increasing day by day, and the pollution of fossil fuel to the environment has also aroused more and more extensive attention, and the development of safe, clean and sustainable energy conversion and storage system is imperative.

As one of the most important processes for the generation and storage of renewable energy sources, the oxygen evolution reaction (OER, 2H)₂O→O₂+4H⁺+4e^-) In recent years, attention and research have been widely drawn. IrO₂And RuO₂Has high activity and is recognized as the best OER electro-catalyst. However, the high price and scarcity of noble metals severely hamper their widespread use in the catalytic field. Therefore, there is an urgent need to develop electrocatalysts composed of non-noble metals or elements rich in abundance, which still exhibit high catalytic ability at low overpotentials to accelerate the reaction, instead of the use of noble metals. In general, ordered geometrically constrained structures with large surface areas, uniform structures, and high porosity have excellent properties in electrocatalysis.

In recent years, Layered Double Hydroxides (LDHs) having a brucite layered crystal structure have been widely studied due to their increasingly widespread use in various fields such as catalysis and electrochemistry. Compared with the traditional nano-particles, the LDH can provide more active sites on the surface due to the macroporous nano-sheet structure. Research proves that the iron-nickel layered double hydroxide (FeNi-LDH) electrocatalyst with a three-dimensional structure has high activity on OER in a base medium. However, most of the FeNi-based LDHs reported so far are of a powder type, and therefore, in the process of preparing an electrode, a binder must be used to attach a catalytic material to the electrode surface, but this not only takes time, but also easily causes the catalyst to be detached during a long-term electrolysis.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects existing in the prior art, the utility model provides a composite electrode for catalyzing the decomposition of water to produce oxygen.

The utility model adopts the following technical scheme:

the utility model provides a combined electrode for catalyzing decomposition of water to produce oxygen comprises the crisscross functional fiber who weaves of stranded, functional fiber is the cladding structure, by the fibre body and in proper order the cladding be in the conducting layer and the catalytic material layer of fibre body surface constitute.

According to the utility model provides a composite electrode for catalyzing decomposition of water to produce oxygen, in every share the fibrous quantity of function is 50 ~ 100.

According to the utility model provides a composite electrode for catalyzing water decomposition to produce oxygen, the thickness of conducting layer is 0.1 ~ 1 mu m.

According to the utility model provides a combined electrode for catalyzing water decomposition to produce oxygen, the conducting layer is nickel nanoparticle layer, and wherein nickel nanoparticle's particle diameter is less than 100 nm.

According to the utility model provides a combined electrode for catalyzing decomposition of water to produce oxygen, the thickness on catalysis material layer is 15 ~ 25 nm.

According to the utility model provides a composite electrode for catalyzing decomposition of water to produce oxygen, the catalytic material layer is iron-nickel layered double metal hydroxide nanosheet.

According to the utility model provides a composite electrode for catalyzing decomposition of water to produce oxygen, composite electrode is porous structure, and the porosity is 1% ~ 5%.

The utility model has the advantages that:

the utility model provides a combined electrode for catalyzing water decomposition to produce oxygen, this combined electrode have bigger specific surface area, more catalytic activity sites and lower impedance for this electrode has excellent electric conductivity and electro-catalytic activity simultaneously, has wide application prospect in electrolysis aquatic oxygen field.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a composite electrode for catalyzing the decomposition of water to produce oxygen provided by the present invention;

FIG. 2 is a schematic structural view of the functional fibers in the composite electrode of FIG. 1;

FIG. 3 is a schematic cross-sectional view of a functional fiber;

reference numerals:

1: functional fibers; 1-1: a layer of catalytic material; 1-2: a conductive layer; 1-3: a fiber body.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The embodiment of the utility model provides a composite electrode for catalyzing decomposition of water to produce oxygen, its structural diagram is shown in fig. 1, comprises the function fibre 1 of crisscross weaving of stranded, and function fibre 1 is the cladding structure, comprises fibre body 1-3 and cladding in proper order at the conducting layer 1-2 and the catalytic material layer 1-1 of fibre body 1-3 surface. Namely, the functional fiber 1 is sequentially a fiber body 1-3, a conductive layer 1-2 and a catalytic material layer 1-1 from inside to outside, and the schematic structural diagram and the schematic cross-sectional diagram are respectively shown in fig. 2 and fig. 3.

The utility model directly coats the conductive layer and the catalytic material layer on the surface of the fiber body, compared with the traditional macroscopic multi-layer composite catalytic electrode, the directly coated functional fiber has larger specific surface area, the active sites are increased, and the catalytic efficiency is improved; in addition, the conductive layer on the surface of the fiber can effectively reduce the impedance of the composite electrode, so that the composite electrode has excellent conductivity and electrocatalytic activity. And a large number of pores exist among the functional fibers, namely the composite electrode is of a porous structure, and is favorable for ion transmission and substance exchange in catalytic reaction.

Wherein, the fiber body 1-3 is cotton fiber, which can be artificial cotton fiber or primary cotton fiber. The commercial cotton fiber is used as a raw material, the price is low, and the composite electrode formed by weaving the fiber has high strength and good flexibility.

Based on the above examples, the porosity of the composite electrode in this example was 2%.

Based on the above embodiment, the number of the functional fibers 1 in each strand of the present embodiment is 50 to 100 (fig. 1 is a schematic view, and the actual number of the functional fibers in each strand is not shown), and preferably 60 to 80, where the number of the functional fibers 1 in each strand may be the same or different.

Based on the above embodiments, the thickness of the conductive layer 1-2 in this embodiment is 0.1 to 1 μm.

Further, the conductive layer 1-2 is a nickel nanoparticle layer, wherein the particle size of the nickel nanoparticles is less than 100 nm.

Based on the above embodiments, the thickness of the catalytic material layer 1-1 in this embodiment is 15 to 25 nm.

Further, the catalytic material layer 1-1 is an iron-nickel layered double-metal hydroxide nanosheet.

The utility model also provides a preparation method of above-mentioned composite electrode for catalyzing decomposition of water to produce oxygen, include:

providing cotton fibers with gold nanoclusters attached;

in-situ growing nickel nanoparticles in the nickel-containing plating solution by using the cotton fibers attached with the gold nanoclusters;

electroplating the cotton fiber attached with the nickel nanoparticles in an electrolyte containing a mixed solution of ferric nitrate and nickel nitrate to obtain a functional fiber with an outer layer attached with an iron-nickel layered double-metal hydroxide nanosheet;

and weaving the functional fibers to form the composite electrode.

Further, the method for preparing the cotton fiber attached with gold nanoclusters includes: firstly, soaking cotton fibers in a chloroauric acid solution, and then reducing the chloroauric acid adsorbed on the cotton fibers by using sodium borohydride.

The gold nanoclusters serve as nucleation sites and catalysts for subsequent growth of nickel nanoparticles, and the particle size of the gold nanoclusters is smaller than 4 nm.

Example 1

The embodiment provides a composite electrode for catalyzing water decomposition to produce oxygen, which is composed of a plurality of strands of functional fibers which are woven in a staggered mode, wherein the functional fibers are of a coating structure and are composed of a fiber body, and a conductive layer and a catalytic material layer which are sequentially coated on the outer surface of the fiber body. The fiber body is cotton fiber, the conducting layer is a nickel nanoparticle layer, the thickness is 0.5 mu m, the particle size of the nickel nanoparticle is smaller than 100nm, the catalytic material layer is an iron-nickel layered double-metal hydroxide nanosheet, and the thickness is 15-25 nm.

The embodiment also provides a preparation method of the composite electrode, which comprises the following steps:

soaking cotton fibers in a 0.4% chloroauric acid solution for 4 hours, cleaning the cotton fibers with distilled water for more than three times, reducing the cotton fibers in a 0.1mol/L sodium borohydride solution for 5 minutes, and finally cleaning the cotton fibers with distilled water for more than three times to obtain the cotton fibers attached with gold nanoclusters;

soaking the cotton fiber attached with the gold nanoclusters in a nickel-containing plating solution for in-situ growth of nickel nanoparticles for 20 minutes, and then cleaning the cotton fiber with distilled water for more than three times to obtain the cotton fiber attached with the nickel nanoparticles;

soaking the cotton fiber attached with the nickel nanoparticles in an electrolytic cell filled with a mixed solution of ferric nitrate and nickel nitrate for electroplating to obtain a functional fiber with an iron-nickel layered double-metal hydroxide nanosheet attached to the surface;

and step four, stranding 60-80 functional fibers per strand, and then weaving a plurality of strands in a staggered manner to form the target composite electrode.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The composite electrode for catalyzing water decomposition to produce oxygen is characterized by being composed of a plurality of strands of functional fibers which are woven in a staggered mode, wherein the functional fibers are of a coating structure and are composed of a fiber body, and a conductive layer and a catalytic material layer which are sequentially coated on the outer surface of the fiber body.

2. The composite electrode for the catalytic decomposition of water to oxygen as claimed in claim 1, wherein the number of said functional fibers per strand is 50-100.

3. The composite electrode for catalyzing the decomposition of water to produce oxygen as claimed in claim 1, wherein the conductive layer has a thickness of 0.1 to 1 μm.

4. The composite electrode for catalyzing the decomposition of water to produce oxygen of claim 3 wherein said conductive layer is a layer of nickel nanoparticles wherein the particle size of the nickel nanoparticles is less than 100 nm.

5. The composite electrode for catalyzing the decomposition of water to produce oxygen as claimed in claim 1, wherein the thickness of the catalytic material layer is 15 to 25 nm.

6. The composite electrode for the catalytic decomposition of water to oxygen as claimed in claim 5, wherein the catalytic material layer is an iron-nickel layered double metal hydroxide nanosheet.

7. The composite electrode for catalyzing the decomposition of water to produce oxygen according to any one of claims 1 to 6, wherein the composite electrode has a porous structure and a porosity of 1% to 5%.