KR20210111508A - Hetero metal oxide nanostructure, preparing method of the same, and electrode including the same - Google Patents

Abstract

The present application relates to a dissimilar metal oxide nanostructure including a dissimilar metal oxide layer formed on a substrate including a first metal, wherein the dissimilar metal oxide layer includes dissimilar metal oxide nanoparticles including the first metal and a second metal different from the first metal.

Description

Dissimilar metal oxide nanostructure, manufacturing method thereof, and electrode comprising same

The present application relates to a dissimilar metal oxide nanostructure, a manufacturing method thereof, and an electrode including the dissimilar metal oxide nanostructure.

When fossil fuels such as petroleum and coal are burned for the purpose of electric energy, transportation, etc., carbon dioxide and methane are generated, thereby adversely affecting the environment, such as causing global warming. In order to solve these problems, research on various eco-friendly alternative energy is active.

As an alternative energy source, there is a fuel cell in which water and energy are obtained by reacting hydrogen and oxygen. A fuel cell is a device that generates energy by electrochemically reacting fuel with an oxidizing agent. In general, hydrogen is used as a fuel and oxygen is used as an oxidizing agent.

The fuel cell has a very high power generation efficiency of 40% to 80%, less noise generated during power generation, and a small area required for power generation. Above all, the by-product of the reaction is water, so it is harmless to the environment. Accordingly, the fuel cell is attracting attention as a next-generation energy device.

In order to commercialize the fuel cell as described above, it is necessary to efficiently supply hydrogen and oxygen as reactants. A common method for obtaining hydrogen and oxygen is to electrolyze water. Accordingly, there is a need for research on an electrode catalyst for efficiently electrolyzing water.

Research on nanostructures as electrode catalysts for electrolysis reactions is being actively conducted. Nanostructure generally refers to an architecture composed of nanoparticles, nanorods, or nanoplates having a size in the range of about 1 nm to about 1 μm, etc. , these nanostructures can be widely used in various fields such as catalysts, pharmaceuticals, paint industry, self-assembly materials, and nonlinear optical materials. In addition, when a nanostructure is formed, it is easy to handle because the size of the nanostructure increases to about several hundred nm to several μm, and it is very useful because it has various properties exhibited when it is a nanoparticle.

However, in manufacturing a nanostructure in which these nano-sized particles are combined, a complex process such as a surfactant and a support is required, and the shape control is not easy, and an additional washing process is unavoidable. Therefore, although a lot of research on the synthesis of nanostructures has been reported, the amount produced is about several milligrams, so there are many problems to be used in actual industry.

In addition, the urea-based synthesis method, which is one of the existing synthesis methods for forming nanostructures, has a problem in that the environment-friendly factor is greatly reduced in that an organic solvent is used. In order to solve the above problems, it is required to develop a method for synthesizing a nanostructure of an oxide on the surface of a metal through a simple process as an eco-friendly condition that does not use an organic solvent, an organic stabilizer, and a binder.

In addition, the electrode catalyst of the conventional electrolysis reaction had to be used by synthesizing the oxide nanostructure and then putting it on the electrode and the substrate. Accordingly, an additional process of applying to the electrode and substrate is required, and it is difficult to form a structure with a large surface area by the above method of application, and it is difficult to form an electrode and a substrate with a large area. When used as an electrochemical electrode, the electrode and the nano There was a problem that resistance occurred between the structures.

Korean Patent Application Laid-Open No. 10-2016-0109149, which is the background technology of the present application, relates to an oxide or hydroxide nanostructure on a metal substrate and a method for synthesizing the same. Specifically, the patent relates to a technique for forming an oxide or hydroxide nanostructure of a single metal vertically grown on a substrate using a corrosion additive. However, the dissimilar metal oxide nanostructure and the manufacturing method thereof are not mentioned.

The present application is intended to solve the problems of the prior art described above, and an object of the present application is to provide a heterometal oxide nanostructure.

In addition, an object of the present application is to provide an electrode including a method for manufacturing the dissimilar metal oxide nanostructure and the dissimilar metal oxide nanostructure on the metal substrate.

However, the technical problems to be achieved by the embodiments of the present application are not limited to the technical problems as described above, and other technical problems may exist.

As a technical means for achieving the above technical problem, the first aspect of the present application is a dissimilar metal oxide nanostructure comprising a dissimilar metal oxide layer formed on a substrate including a first metal, wherein the dissimilar metal oxide layer is It provides a dissimilar metal oxide nanostructure comprising dissimilar metal oxide nanoparticles including the first metal and a second metal different from the first metal.

According to the exemplary embodiment of the present application, the first metal may have a reduction potential lower than that of the second metal, but is not limited thereto.

According to one embodiment of the present application, the dissimilar metal oxide nanoparticles include a first nanoparticle group and a second nanoparticle group, and the first nanoparticle group and the second nanoparticle group have different sizes. However, it is not limited thereto.

According to one embodiment of the present application, the first nanoparticle group includes heterometal oxide nanoparticles having a particle diameter of 20 nm or more, and the second nanoparticle group includes heterometal oxide nanoparticles having a particle diameter of 10 nm or less. It may include, but is not limited to.

According to one embodiment of the present application, the first metal and the second metal are each independently Ni, Fe, Al, Cu, Mn, Na, K, Ru, Au, Pt, Sn, Pd, Zn, Ti, Ir , and may include a metal selected from the group consisting of Ce, but is not limited thereto.

A second aspect of the present disclosure is a method comprising the steps of: impregnating a substrate comprising a first metal into a solution containing a second metal different from the first metal, and on a substrate comprising the first metal, the first metal and the It provides a method of manufacturing a dissimilar metal oxide nanostructure comprising the step of forming dissimilar metal oxide nanoparticles containing a second metal.

According to the exemplary embodiment of the present application, the first metal may have a reduction potential lower than that of the second metal, but is not limited thereto.

According to the exemplary embodiment of the present application, the first metal may be corroded in the solution, but is not limited thereto.

According to one embodiment of the present application, in the step of forming the dissimilar metal oxide nanoparticles, the first nanoparticle group and the second nanoparticle group having different sizes may be sequentially formed, but is not limited thereto.

According to one embodiment of the present application, the solution may not include an organic solvent, but is not limited thereto.

According to one embodiment of the present application, the solution may include deionized water as a solvent, but is not limited thereto.

According to one embodiment of the present application, before the impregnating step, the step of removing the oxide film on the surface of the substrate including the first metal may be further included, but is not limited thereto.

According to the exemplary embodiment of the present application, the oxide layer may be removed by an acidic solution or heat treatment, but is not limited thereto.

A third aspect of the present application provides an electrode for an oxygen evolution reaction (OER) or an electrode for a hydrogen evolution reaction (HER) comprising the dissimilar metal oxide nanostructure according to the first aspect of the present application.

The above-described problem solving means are merely exemplary, and should not be construed as limiting the present application. In addition to the exemplary embodiments described above, additional embodiments may exist in the drawings and detailed description.

According to the above-described problem solving means of the present application, the dissimilar metal oxide nanostructure on the metal substrate according to the present application can provide a dissimilar metal oxide nanostructure on the metal substrate that can effectively promote the redox reaction. Accordingly, the dissimilar metal oxide nanostructure on the metal substrate can be applied to battery electrode materials such as secondary batteries, fuel cells, and super capacitors.

In addition, since the dissimilar metal oxide nanostructure on the metal substrate is directly formed on the metal substrate, the additional process of transferring the dissimilar metal oxide nanostructure on the metal substrate to the electrode or substrate can be omitted. The economic feasibility can be excellent.

In addition, since it is possible to use a large-area metal substrate as the metal substrate, it is possible to provide a dissimilar metal oxide nanostructure including a dissimilar metal oxide layer formed on an electrode having a large area.

In the case of a catalyst synthesized using an existing powder material, the catalyst is attached to the electrode using a binder. Accordingly, the resistance between the electrode and the catalyst increases, which affects the catalyst properties. On the other hand, the dissimilar metal oxide nanostructure on the metal substrate according to the present application can solve the problem because there is no element for reducing the resistance between the electrode and the catalyst.

In addition, the method for preparing the dissimilar metal oxide nanostructures on the metal substrate is ethanol, binder, urea, and organic solvents widely used in the conventional synthesis method of growing oxide nanostructures on a metal surface. It is possible to provide a new synthesis method using water or deionized water as a solvent without using such as, and thus there is no need to separately recover the organic solvent, which can be economical and environmentally friendly.

In addition, the method of manufacturing the dissimilar metal oxide nanostructure on the metal substrate does not add a reducing agent, so a process of removing the reducing agent is unnecessary, and a heterogeneous metal oxide nanostructure with a minimized impurity content can be manufactured.

In addition, the heterometal oxide nanostructure according to the present application is grown in the form of particles rather than growing vertically on the substrate. When the nanostructure is grown vertically on the substrate, it is broken or collapsed in a high-pressure environment, thereby reducing durability. The dissimilar metal oxide nanostructure grown in the form of particles as in the present application has the advantage of excellent durability in a high-pressure environment.

In addition, the dissimilar metal oxide nanostructure according to the present application may be composed of particle groups having different particle sizes. That is, in the process of forming the dissimilar metal oxide, particles having a large particle size (eg, a particle size of 20 nm or more) are formed at the initial stage of the reaction, and particles having a small particle size (eg, a particle size of 10 nm or less) are formed in the late reaction period. do. As the particles having different particle diameters are continuously generated, the pores of the dissimilar metal oxide nanostructure are reduced, and durability can be improved.

However, the effects obtainable herein are not limited to the above-described effects, and other effects may exist.

1 is a structural diagram of a dissimilar metal oxide nanostructure according to an embodiment of the present application.
2 is a schematic diagram of the manufacturing steps of a dissimilar metal oxide nanostructure according to an embodiment of the present application.
3 is a schematic diagram of a manufacturing process of a dissimilar metal oxide nanostructure according to an embodiment of the present application.
4 is a SEM and TEM image of a dissimilar metal oxide nanostructure according to an embodiment of the present application.
5 is a dissimilar metal oxide nanostructure prepared according to an embodiment of the present application.
6 is an XRD pattern of a dissimilar metal oxide nanostructure according to an embodiment of the present application.
7 is a graph showing the characteristics of the dissimilar metal oxide nanostructures according to an embodiment and a comparative example of the present application at the time of oxygen evolution reaction.
8 is a graph showing the characteristics of the dissimilar metal oxide nanostructures according to the Examples and Comparative Examples of the present application during the hydrogen evolution reaction.
9 is a graph showing the characteristics of the dissimilar metal oxide nanostructures according to an embodiment and a comparative example of the present application during an electrochemical water decomposition reaction in 1 M KOH.
10 is a graph showing the characteristics of the dissimilar metal oxide nanostructures according to an embodiment and a comparative example of the present application during an electrochemical water decomposition reaction in 5 M KOH.

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present application pertains can easily implement them. However, the present application may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present application in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout this specification, when a part is said to be "connected" with another part, it includes not only the case where it is "directly connected" but also the case where it is "electrically connected" with another element interposed therebetween. do.

Throughout this specification, when it is said that a member is positioned "on", "on", "on", "under", "under", or "under" another member, this means that a member is positioned on the other member. It includes not only the case where they are in contact, but also the case where another member exists between two members.

Throughout this specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

As used herein, the terms "about," "substantially," and the like are used in a sense at or close to the numerical value when the manufacturing and material tolerances inherent in the stated meaning are presented, and to aid in the understanding of the present application. It is used to prevent an unconscionable infringer from using the mentioned disclosure in an unreasonable manner. Also, throughout this specification, "step to" or "step to" does not mean "step for".

Throughout this specification, the term "combination of these" included in the expression of the Markush form means one or more mixtures or combinations selected from the group consisting of the components described in the expression of the Markush form, and the components It is meant to include one or more selected from the group consisting of.

Throughout this specification, reference to “A and/or B” means “A, B, or A and B”.

Hereinafter, a dissimilar metal oxide nanostructure formed on a metal substrate of the present application, a method for manufacturing the same, and an electrode including the same will be described in detail with reference to embodiments, examples, and drawings. However, the present application is not limited to these embodiments and examples and drawings.

1 is a structural diagram of a dissimilar metal oxide nanostructure according to an embodiment of the present application, and FIG. 2 is a schematic diagram of a manufacturing step of a dissimilar metal oxide nanostructure according to an embodiment of the present application.

As a technical means for achieving the above technical problem, the first aspect of the present application is a dissimilar metal oxide nanostructure comprising a dissimilar metal oxide layer 200 formed on a substrate 100 including a first metal, The dissimilar metal oxide layer 200 provides a dissimilar metal oxide nanostructure comprising dissimilar metal oxide nanoparticles including the first metal and a second metal different from the first metal.

1 and 2 , the dissimilar metal oxide nanostructure is a dissimilar metal oxide layer 200 including dissimilar metal oxide nanoparticles formed on a substrate 100 including a first metal.

The dissimilar metal oxide nanostructure includes two different metals, thereby effectively providing a reaction site for the catalyst to react, and directly growing on the first metal to reduce the electrical resistance inside the catalyst.

According to the exemplary embodiment of the present application, the first metal may have a reduction potential lower than that of the second metal, but is not limited thereto.

As will be described later, the substrate 100 including the first metal is corroded by a reduction potential difference in the manufacturing process of the dissimilar metal oxide nanostructure, and the resulting first metal is the substrate 100 including the first metal ) to form the dissimilar metal oxide layer 200 by reacting with the second metal.

According to the exemplary embodiment of the present application, the dissimilar metal oxide nanoparticles included in the dissimilar metal oxide layer 200 include a first nanoparticle group 210 and a second nanoparticle group 220, and the first nanoparticle The particle stage 210 and the second nanoparticle stage 220 may have different sizes, but is not limited thereto.

According to the exemplary embodiment of the present application, the first nanoparticle group 210 includes dissimilar metal oxide nanoparticles having a particle diameter of 20 nm or more, and the second nanoparticle group 220 has a particle diameter of 10 nm or less. It may include, but is not limited to, dissimilar metal oxide nanoparticles.

As will be described later, in the process of forming the dissimilar metal oxide, a first nanoparticle group 210 having a large particle size is first formed in the initial stage of the reaction, and a second nanoparticle group 220 having a small particle diameter is formed in the latter stage of the reaction. As the particles having different particle diameters are continuously generated, the pores of the dissimilar metal oxide nanostructure are reduced, and durability can be improved.

The first nanoparticle group 210 is, for example, about 20 nm or more, about 30 nm or more, about 40 nm or more, about 50 nm or more, about 60 nm or more, about 70 nm or more, about 80 nm or more, It may have a particle diameter of about 90 nm or more, or about 100 nm or more, but is not limited thereto. The first nanoparticle stage 210 may have a particle diameter of about 500 nm or less, but is not limited thereto.

The second nanoparticle group 220 is, for example, about 10 nm or less, about 9 nm or less, about 8 nm or less, about 7 nm or less, about 6 nm or less, about 5 nm or less, about 4 nm or less, It may have a particle diameter of about 3 nm or less, about 2 nm or less, or about 1 nm or less, but is not limited thereto. The second nanoparticle stage 220 may have a particle diameter of about 0.1 nm or more, but is not limited thereto.

As the particles having different particle diameters are continuously generated, the voids of the dissimilar metal oxide nanostructure may decrease, and durability may be improved. Due to the high durability, the dissimilar metal oxide nanostructure may be used as a battery electrode material such as a secondary battery, a fuel cell, and a super capacitor under a high-pressure environment.

According to one embodiment of the present application, the first metal and the second metal are each independently Ni, Fe, Al, Cu, Mn, Na, K, Ru, Au, Pt, Sn, Pd, Zn, Ti, Ir , and may include a metal selected from the group consisting of Ce, but is not limited thereto.

Preferably, the first metal may be Ni and the second metal may be Fe. Accordingly, the dissimilar metal oxide layer 200 may be a dissimilar metal oxide layer of Ni and Fe, but is not limited thereto.

In this regard, when the first metal or the second metal is cobalt, the heterometal oxide layer 200 does not grow in the form of particles but grows in a vertical form. When the nanostructure is grown vertically on the substrate 100, it is broken or collapsed in a high-pressure environment, thereby reducing durability.

Since the first metal and the second metal of the present application do not include cobalt, the heterometal oxide nanostructure grows in a particle shape, not a vertical shape. Accordingly, the dissimilar metal oxide nanostructure has an advantage of excellent durability in a high-pressure environment.

A second aspect of the present application is to immerse a substrate 100 including a first metal into a solution containing a second metal different from the first metal and on the substrate 100 including the first metal, It provides a method of manufacturing a dissimilar metal oxide nanostructure comprising the step of forming dissimilar metal oxide nanoparticles comprising the first metal and the second metal.

With respect to the method of manufacturing a dissimilar metal oxide nanostructure of the second aspect of the present application, detailed descriptions for parts overlapping with the first aspect of the present application are omitted, but even if the description is omitted, the contents described in the first aspect of the present application are The same can be applied to the second aspect of

3 is a schematic diagram of a manufacturing process of a dissimilar metal oxide nanostructure on a metal substrate 100 according to an embodiment of the present application.

According to the exemplary embodiment of the present application, the first metal may have a lower reduction potential than the second metal, and thus the first metal may be corroded in the solution, but is not limited thereto.

The corrosion may be activated by reduction of a metal having a high reduction potential among the first metal and the second metal. Since the first metal is corroded by a reduction potential difference with the second metal, corrosion of the first metal may be promoted without adding an additional reducing agent or corrosion additive. Accordingly, a process of removing the reducing agent or corrosion additive is unnecessary, and the impurity content can be minimized.

The first metal corrodes in solution. In particular, the second metal has a higher reduction potential than the first metal, and thus the corrosion proceeds more easily. During the corrosion process, the first metal and the second metal react in a solution to form the dissimilar metal oxide layer 200 on the substrate 100 including the first metal.

According to one embodiment of the present application, in the step of forming the dissimilar metal oxide nanoparticles, the first nanoparticle group 210 and the second nanoparticle group 220 having different sizes may be sequentially formed, However, the present invention is not limited thereto.

Specifically, in the process of forming the dissimilar metal oxide, a first nanoparticle group 210 (eg, a particle diameter of 20 nm or more) with a large particle size is formed at the beginning of the reaction, and a second nanoparticle group with a small particle size ( 220) (eg, a particle diameter of 10 nm or less) is formed. As the particles having different particle diameters are continuously generated, the pores of the dissimilar metal oxide nanostructure are reduced, and durability can be improved.

According to one embodiment of the present application, the solution may not include an organic solvent, but is not limited thereto.

In the conventional synthesis method, an organic solvent was mainly used as the solvent. For most organic solvents, they are known to have harmful components and influence on the environment. The conventional method for synthesizing a nanostructure is known to use organic solvents, and the method for preparing a dissimilar metal oxide nanostructure according to the present application does not include an organic solvent, so it is eco-friendly and has a low manufacturing cost.

According to one embodiment of the present application, the solution may include deionized water as a solvent, but is not limited thereto.

According to one embodiment of the present application, before the impregnating step, the step of removing the oxide film on the surface of the substrate 100 including the first metal may be further included, but is not limited thereto.

The oxide film on the surface of the metal substrate 100 may have corrosion resistance. Therefore, by removing the oxide film, the corrosion reaction may proceed more smoothly.

According to the exemplary embodiment of the present application, the oxide layer may be removed by an acidic solution or heat treatment, but is not limited thereto.

For example, the oxide film may be removed by first removing it in an acidic solution having a pH of less than 5 and then heat-treating it at a temperature of 300°C to 600°C, but is not limited thereto.

A third aspect of the present application provides an electrode for an oxygen evolution reaction (OER) or an electrode for a hydrogen evolution reaction (HER) comprising the dissimilar metal oxide nanostructure according to the first aspect of the present application.

With respect to an electrode for oxygen evolution reaction (OER) or an electrode for hydrogen evolution reaction (HER) comprising a dissimilar metal oxide nanostructure according to the third aspect of the present application, in parts overlapping with the first and second aspects of the present application Although detailed description is omitted, the contents described in the first and second aspects of the present application may be equally applied to the third aspect of the present application even if the description is omitted.

The electrode for the oxygen evolution reaction (OER) or the electrode for the hydrogen evolution reaction (HER) can react by directly forming the nanostructure on the substrate 100 including the first metal without applying the nanostructure to the electrode. It may have a large surface area.

The electrode for the oxygen evolution reaction (OER) or the electrode for the hydrogen evolution reaction (HER), for example, because there is no element that reduces the resistance between the electrode and the catalyst, such as a binder, resistance between the electrode and the nanostructure occurs. problem can be solved.

The present invention will be described in more detail through the following examples, but the following examples are for illustrative purposes only and are not intended to limit the scope of the present application.

[Example] Preparation of dissimilar metal oxide nanostructures

The surface oxide film of nickel foam (Ni foam, NF) was removed through heat treatment under an acidic solution or hydrogen atmosphere. 66.7 mM of Fe (NO ₃₎ was then impregnated with the nickel foam to the _aqueous solution and stirred at 95 ℃ at 300 rpm by a reduction potential difference of the nickel foam and Fe (NO _{3) 3} aqueous Fe ion corrosion of nickel foam .

^{As the reaction proceeded, Ni 2+} ions and Fe ³⁺ ions generated by nickel foam corrosion in the aqueous solution reacted on the surface of the nickel foam to form NiFe _x O ₄ (heterogeneous metal oxide nanoparticles) nanostructures . The surface of the NiFe _x O ₄ was washed with ultrapure water and then dried.

4 is an SEM and TEM image of the prepared NiFe _x O _{4 .} Through this, it was confirmed that _{NiFe x} O ₄ having different sizes over time was formed on the nickel metal substrate.

5 is a photograph of _{the NiFe x} O _{4 electrode prepared above.} Through this, _{it was confirmed that NiFe x} O ₄ was formed on a nickel metal substrate in a large area.

6 is an XRD pattern of the prepared NiFe _x O _{4 .} Through this, it was possible to confirm the inverse spinel structure.

[Comparative example]

Nickel foam, IrO ₂ /NF and platinum catalyst (Pt/C) were purchased and used as comparative examples. IrO ₂ is a representative oxygen evolution reaction catalyst reported on the literature, and Pt/C is a representative hydrogen evolution reaction catalyst reported on the literature. IrO ₂ + Pt/C was used as a comparative example of the electrochemical water decomposition reaction.

[Experimental Example 1]

7 is a graph showing characteristics of the dissimilar metal oxide nanostructures according to the Examples and Comparative Examples during the oxygen evolution reaction.

The electrochemical reaction results were measured using CHI 600D.

It was confirmed that the dissimilar metal oxide nanostructure according to the embodiment of the present application exhibits the lowest overvoltage through (A) of FIG. 7 . The lower the overvoltage, the higher the efficiency of the catalyst. Therefore, it was confirmed that the dissimilar metal oxide nanostructures of the examples of the present application had higher oxygen generation reaction catalytic efficiency than _{nickel foam and IrO 2 (Comparative Example).}

In addition, it was confirmed that the graph of the dissimilar metal oxide nanostructure according to the embodiment of the present application is located at the bottom in (B) of FIG. 7 . Since it is a catalyst that promotes a faster reaction at the lower end of the graph, the dissimilar metal oxide nanostructure of the example of the present application has an excellent effect of speeding up the oxygen generation reaction rate compared _{to nickel foam and IrO 2 (Comparative Example).}

[Experimental Example 2]

8 is a graph showing characteristics of the dissimilar metal oxide nanostructures according to the Examples and Comparative Examples during hydrogen generation reaction.

The electrochemical reaction results were measured using CHI 600D.

8(A) , it was confirmed that the dissimilar metal oxide nanostructure according to the embodiment of the present application exhibited a higher overvoltage than that of Pt/C (Comparative Example). The lower the overvoltage, the higher the efficiency of the catalyst. Therefore, it was confirmed that the heterogeneous metal oxide nanostructures of the examples of the present application had lower hydrogen generation reaction catalytic efficiency than Pt/C (Comparative Example).

In addition, it was confirmed that the graph of the dissimilar metal oxide nanostructure according to the embodiment of the present application in (B) of FIG. 8 shows a slope close to that of Pt/C (Comparative Example). Since it is a catalyst that promotes a faster reaction at the lower end of the graph, it was confirmed that the dissimilar metal oxide nanostructures of the examples of the present application had an excellent effect of speeding up the reaction rate at a level similar to that of Pt/C (Comparative Example).

[Experimental Example 3]

9 is a graph showing the characteristics of the dissimilar metal oxide nanostructures according to the Examples and Comparative Examples of the present application during an electrochemical water decomposition reaction in 1 M KOH, and FIG. It is a graph showing the characteristics of the dissimilar metal oxide nanostructure during the electrochemical water decomposition reaction in 5 M KOH.

The electrochemical reaction results were measured using CHI 600D.

9(A) and 10(A), it was confirmed that the dissimilar metal oxide nanostructure according to the embodiment of the present application exhibited the lowest overvoltage. The lower the overvoltage, the higher the efficiency of the catalyst. Therefore, it was confirmed that the dissimilar metal oxide nanostructures of the examples of the present application had high electrochemical water decomposition reaction catalytic efficiency in 1 M KOH and 5 M KOH as compared _{to nickel foam and IrO 2 + Pt/C (Comparative Example).}

In addition, the graph of the different metal oxide nano-structure according to the embodiment of the present in (B) of Figure 9 it was confirmed that the same position as IrO ₂ + Pt / C (Comparative Example). Since it is a catalyst that promotes a faster reaction at the bottom of the graph, the heterometal oxide nanostructure of the example of the present application has an effect of speeding up the electrochemical water decomposition reaction rate in 1 M KOH IrO ₂ + Pt/C (Comparative Example) Similar to It was confirmed that the level was excellent.

In addition, it was confirmed that the graph of the dissimilar metal oxide nanostructure according to the embodiment of the present application is located at the bottom in (B) of FIG. 10 . Since it is a catalyst that promotes a faster reaction at the lower end of the graph, the dissimilar metal oxide nanostructure of the example of the present application has the effect of speeding up the electrochemical water decomposition reaction rate in 5 M KOH IrO ₂ + Pt/C (Comparative Example) Compared to excellence was confirmed.

The above description of the present application is for illustration, and those of ordinary skill in the art to which the present application pertains will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present application is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present application.

Claims (15)

In the dissimilar metal oxide nanostructure comprising a dissimilar metal oxide layer formed on a substrate including a first metal,
The dissimilar metal oxide layer will include dissimilar metal oxide nanoparticles comprising a second metal different from the first metal and the first metal,
Dissimilar metal oxide nanostructures.
The method of claim 1,
The first metal has a reduction potential lower than that of the second metal, a dissimilar metal oxide nanostructure.
The method of claim 1,
The dissimilar metal oxide nanoparticles include a first nano-particle group and a second nano-particle group,
The first nano-particle group and the second nano-particle group have different sizes from each other,
Dissimilar metal oxide nanostructures.
4. The method of claim 3,
The first nanoparticle group includes heterometal oxide nanoparticles having a particle diameter of 20 nm or more,
The second nano-particle group will include dissimilar metal oxide nanoparticles having a particle diameter of 10 nm or less,
Dissimilar metal oxide nanostructures.
The method of claim 1,
The first metal and the second metal are each independently selected from the group consisting of Ni, Fe, Al, Cu, Mn, Na, K, Ru, Au, Pt, Sn, Pd, Zn, Ti, Ir, and Ce A heterogeneous metal oxide nanostructure comprising a metal.
impregnating a substrate comprising a first metal onto a solution containing a second metal different from the first metal; and
forming heterometal oxide nanoparticles including the first metal and the second metal on the substrate including the first metal;
containing,
A method for manufacturing a dissimilar metal oxide nanostructure.
7. The method of claim 6,
The first metal has a lower reduction potential than the second metal,
A method for manufacturing a dissimilar metal oxide nanostructure.
7. The method of claim 6,
The method for producing a dissimilar metal oxide nanostructure, wherein the first metal is corroded in the solution.
7. The method of claim 6,
In the step of forming the dissimilar metal oxide nanoparticles, the first nanoparticle group and the second nanoparticle group having different sizes are sequentially formed,
A method for manufacturing a dissimilar metal oxide nanostructure.
7. The method of claim 6,
The solution does not contain an organic solvent, the method for producing a dissimilar metal oxide nanostructure.
7. The method of claim 6,
The solution is to include ultrapure water (deionized water) as a solvent, the method for producing a dissimilar metal oxide nanostructures.
7. The method of claim 6,
Before the impregnating step, the method of manufacturing a dissimilar metal oxide nanostructure further comprising the step of removing the oxide film on the surface of the substrate containing the first metal.
13. The method of claim 12,
The oxide film is to be removed by an acidic solution or heat treatment, a method of manufacturing a dissimilar metal oxide nanostructure.
According to any one of claims 1 to 5 comprising a dissimilar metal oxide nanostructure,
Electrodes for oxygen evolution reaction (OER).
According to any one of claims 1 to 5 comprising a dissimilar metal oxide nanostructure,
Electrodes for hydrogen evolution reaction (HER).

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