Super-anaerobic dual-function water electrolysis electrode based on non-noble metal-non-metal mixed catalyst and manufacturing method therefor

Abstract

The present invention relates to a super-anaerobic dual-function water electrolysis electrode based on a non-noble metal-non-metal mixed catalyst and a manufacturing method therefor. According to the present invention, by reducing the size of gas bubbles, which are generated during a water electrolysis reaction, to be easily separated from the electrode surface and at the same time, to maximize the active surface area of a catalyst, a super-anaerobic water electrolysis electrode having excellent performance can be provided.

Description

Superanaerobic dual-functional water electrolysis electrode based on a non-precious metal-non-metal mixed catalyst and method for manufacturing the same

[0001] This application claims priority to Korean Patent Application No. 10-2024-0125934 filed on September 13, 2024, and the entire specification is a reference to this application.

[0002] The present invention relates to a super-anaerobic dual-function water electrolysis electrode based on a non-precious metal-non-metal mixed catalyst and a method for manufacturing the same.

[0003]

[0004] As industrial development progresses, the use of fossil fuels such as coal and oil increases, leading to a rise in carbon dioxide emissions and the emergence of serious environmental pollution. Consequently, extensive research is being conducted worldwide to develop new and renewable energy sources capable of replacing conventional fossil fuels, with the goal of achieving carbon neutrality. With interest in hydrogen energy surging to efficiently store these renewables, various countries are publishing hydrogen development roadmaps. Hydrogen is highly suitable as a next-generation energy storage medium because it offers high energy conversion efficiency relative to weight and does not emit toxic gases when used as fuel.

[0005] Existing methods for producing hydrogen energy include methane reforming and coal gasification; however, these methods are carried out under high temperature and pressure conditions and have the disadvantage of emitting carbon dioxide during the production process. Therefore, water electrolysis systems capable of producing hydrogen in an environmentally friendly manner are considered the ultimate goal.

[0006] To maximize overall performance in a water electrolysis system, the catalyst within the electrode must exhibit excellent hydrogen and oxygen generation capabilities within the same electrolyte. In particular, hydrogen can be produced more efficiently as the active surface area of ​​the catalyst in contact with water increases, and as the adsorption and desorption rates of reaction intermediates on the catalyst surface increase.

[0007] To commercialize a water electrolysis system, the electrolysis electrode must be capable of producing a large amount of hydrogen at low voltage, and ensuring operational stability at high currents is essential.

[0008] However, the massive amount of hydrogen and oxygen gas bubbles produced at high currents adheres to the electrode surface, reducing the active surface area of ​​the catalyst and hindering the penetration of the electrolyte into the electrode. Furthermore, the pressure formed when the bubbles detach can cause the detachment and peeling of the catalyst layer. Therefore, there is a need to develop electrode fabrication technology capable of controlling bubbles generated during the reaction while maintaining excellent operating stability and high performance at high currents.

[0009] Precious metals such as Pt for the cathode and Ir and Ru for the anode were primarily used as conventional water electrolysis catalysts; however, due to their high cost and limited availability, they were mainly produced in the form of nanoparticles or powders. Since these forms cannot be coated onto electrodes alone, catalyst inks blended with Nafion polymer or carbon black were applied onto a support. However, this coating method suffers from reduced charge transfer due to the insulating material Nafion, and the low hygroscopicity of carbon black affects the contact area between the electrolyte and the catalytic active site, ultimately leading to a degradation in the overall performance of the water electrolysis system.

[0010] Nickel phosphide (NiP) is known as a non-precious metal-non-metal mixed water electrolysis catalyst with excellent electrical conductivity that can be utilized in both hydrogen and oxygen evolution reactions. NiP can easily cleave the HO-H bond, and the decomposed intermediate H adP is adsorbed to the surface with appropriate strength, recombines with hydrogen, and is easily desorbed rapidly. Furthermore, P plays a role in increasing catalytic activity by inducing electron transfer to Ni, and contributes to the formation of NiOOH (nickel hydroxide), a key material for oxygen generation, by increasing delocalized electrons on the electrode surface. Based on these characteristics, NiP can be used as a dual-function water electrolysis catalyst applicable to both the cathode and anode, possessing significant economic impact as a potential replacement for precious metal catalysts. However, for application in actual water electrolysis systems, additional research is required to control bubbles by maximizing the high super-anaerobicity of the electrode surface—that is, its gas-repelling properties—under high current conditions. More specifically, the development of super-anaerobic water electrolysis electrodes and manufacturing methods is required to minimize bubble size and facilitate easy separation.

[0011] Accordingly, the inventors of the present invention, through diligent efforts to solve the aforementioned problems, fabricated a nanostructure-based super-anaerobic dual-functional electrode having high water electrolysis performance and excellent stability even at high currents by coating a uniform non-precious metal-non-metal mixed catalyst onto various conductive supports via electroplating using a simple method and additionally coating a hydrophilic monomer material, and completed the present invention by analyzing its characteristics.

[0012]

[0013] The present invention provides a super-anaerobic dual-function water electrolysis electrode based on a non-precious metal-non-metal mixed catalyst, a method for manufacturing the same, and a water electrolysis device including the same.

[0014] However, the technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below.

[0015]

[0016] The present invention provides a method for manufacturing a water electrolysis electrode comprising the steps of: forming a non-precious metal-non-metal mixed catalyst layer on a conductive support (step a); and subsequently modifying the surface with a hydrophilic organic material (step b).

[0017] The above conductive support can be selected from the group consisting of metal foam, carbon cloth, and fabric materials.

[0018] The above fabric material may be imparted conductivity through carbonization by heat treatment or through the stacking of conductive nanoparticles.

[0019] The fabric material may include one or more selected from the group consisting of cotton fibers, silk, cellulose, polyester, nylon, and acrylic fibers.

[0020] In step (a) above, the non-precious metal-non-metal mixed catalyst layer can be formed by electroplating.

[0021] The non-precious metal in the above non-precious metal-non-metal mixed catalyst layer may include one or more selected from the group consisting of Ni, Co, Fe, Mo, V, W, and Cu. The non-metal may include one or more selected from the group consisting of O, P, S, N, Se, and C.

[0022] The above catalyst layer may have a nanostructure.

[0023] The above step (b) can be performed by coating with a hydrophilic organic material.

[0024] The above hydrophilic organic material may be an organic material having an amine group.

[0025] The organic material having the above amine group may include one or more selected from the group consisting of tris(2-aminoethyl)amine, hydrazine, diethylenetriamine, poly(ethylenimine), and poly(allylamine hydrochloride).

[0026] The above method can reduce the water contact angle and increase the air contact angle by forming a non-precious metal-non-metal mixed catalyst layer and then modifying the surface with a hydrophilic organic material.

[0027] The above method can be applied to the manufacture of alkaline water electrolysis electrodes or anion electrolyte membrane water electrolysis electrodes.

[0028] In addition, the present invention provides a water electrolysis electrode comprising a non-precious metal-non-metal mixed catalyst layer formed on a conductive support, wherein the surface of the mixed catalyst layer is modified by a hydrophilic organic material.

[0029] The above-mentioned water electrolysis electrode may be a dual-function electrode applicable to both the cathode and the anode.

[0030] The above-mentioned water electrolysis electrode may be an alkaline water electrolysis electrode.

[0031] In addition, the present invention provides a water electrolysis device comprising the above-mentioned water electrolysis electrode.

[0032]

[0033] The present invention enables the fabrication of a water electrolysis electrode based on a non-precious metal-non-metal mixed catalyst having a nanostructure with a large surface area through a simple electroplating method on a conductive material having a porous structure.

[0034] In addition, the present invention makes it possible to produce an ultra-anaerobic water electrolysis electrode with excellent performance by coating an organic material having a hydrophilic amine group through a simple solution process, thereby reducing the size of gas bubbles generated during the water electrolysis reaction to facilitate separation from the electrode surface, and at the same time maximizing the active surface area of ​​the catalyst.

[0035] In addition, the water electrolysis electrode produced through the present invention forms extremely small bubbles and rapidly separates them even under high current conditions, thereby preventing the desorption and deactivation of the catalyst, maintaining a low voltage, and enabling stable operation for a long time.

[0036] In addition, the electrode produced through the present invention is a dual-functional electrode applicable to both the anode and cathode, enabling the production of water electrolysis electrodes in an economical and simple manner.

[0037] In addition, the water electrolysis electrode produced through the present invention possesses excellent charge transport capability due to its porous structure and exhibits excellent electrolyte penetration, thereby achieving high water electrolysis performance.

[0038] In addition, the water electrolysis electrode produced through the present invention facilitates the formation of a surface and a hydrogen intermediate, thereby possessing excellent hydrogen generation capabilities.

[0039] In addition, the water electrolysis electrode produced through the present invention promotes electron transfer to Ni under the influence of P on the surface and forms NiOOH, thereby possessing excellent oxygen generation performance.

[0040] In addition, the present invention is a method for coating a simple electroplating catalyst layer, and there are no restrictions on the size or shape of the electrode to be manufactured.

[0041]

[0042] FIG. 1 is a diagram schematically illustrating the process of a method for manufacturing a water electrolysis electrode according to an embodiment of the present invention.

[0043] FIG. 2 is a drawing showing a scanning electron microscope image of a water electrolysis electrode according to an embodiment of the present invention.

[0044] Figure 3 is a diagram showing an image analyzing the water / bubble contact angle of a water electrolysis electrode according to an embodiment of the present invention.

[0045] Figure 4a is a graph analyzing the electrochemical characteristics of hydrogen generation in a 1M KOH electrolyte. Figure 4b is a graph analyzing the electrochemical characteristics of oxygen generation in a 1M KOH electrolyte.

[0046] Figure 5a is a graph analyzing the operating stability of the hydrogen generation reaction at various current densities in a 1M KOH electrolyte. Figure 5b is a graph analyzing the operating stability of the oxygen generation reaction at various current densities in a 1M KOH electrolyte.

[0047] FIGS. 6a to 6c are graphs analyzing super-anaerobic characteristics by comparing the average diameter values ​​of gases generated during a water electrolysis reaction according to the implementation process of the present invention: (Fig. 6a) nickel foam in a 1 M KOH electrolyte, (Fig. 6b) nickel foam plated with NiP, (Fig. 6c) comparative analysis of the diameter of hydrogen gas generated in nickel foam coated with an amine material and plated with NiP.

[0048] Figure 7 is a graph analyzing the water electrolysis reaction efficiency of a water electrolysis electrode according to an embodiment of the present invention.

[0049]

[0050] The present invention will be described in detail below.

[0051] The present invention achieves excellent performance and operational stability along with the super-anaerobicity of a water electrolysis electrode by uniformly coating a non-precious metal-non-metal mixed catalyst onto various conductive supports (metal foam, carbon cloth, or fabric materials, etc.) using a simple electroplating method, and finally coating a hydrophilic material through surface modification.

[0052] Furthermore, the water electrolysis electrode fabricated by the above method possesses a porous nanostructure along with high electrical conductivity. Due to this structure, a high-performance water electrolysis electrode was realized that provides a large surface area to facilitate the penetration of the electrolyte and allows hydrogen and oxygen gas bubbles generated by the decomposition of water to be rapidly separated from the surface.

[0053] In addition, through interface design between electrode components, a water electrolysis electrode with excellent stability capable of maintaining a low voltage for a long time under high current conditions was realized.

[0054]

[0055] Referring to FIG. 1, a method for manufacturing a water electrolysis electrode according to an embodiment of the present invention comprises the steps of (1) forming a non-precious metal-non-metal mixed catalyst on a conductive support and (2) coating a hydrophilic material.

[0056] Step (1) above is a step of forming a catalyst layer by electroplating a non-precious metal-non-metal mixed catalyst on a conductive support. Through electroplating, a uniform coating of the non-precious metal-non-metal mixed catalyst can be achieved on the conductive support, and the coated catalyst layer has a nano structure, which provides excellent anaerobicity of the water electrolysis electrode. Since Step (1) above is performed in a short time in a simple manner, the time required for catalyst manufacturing can be shortened, manufacturing costs can be lowered, and efficient control is possible.

[0057] Step (2) above is a step of coating a hydrophilic organic material on a conductive support on which a non-precious metal-non-metal mixed catalyst layer is formed. At this time, hydrophilicity and anaerobicity are maximized by the hydrophilic organic material, thereby improving hydrogen generation and oxygen generation performance.

[0058]

[0059] More specifically, the present invention provides a method for manufacturing a water electrolysis electrode comprising the steps of: forming a non-precious metal-non-metal mixed catalyst layer on a conductive support (step a); and subsequently modifying the surface with a hydrophilic organic material (step b).

[0060] According to the present invention, by forming a non-precious metal-non-metal mixed catalyst layer and then modifying the surface with a hydrophilic organic material, the water contact angle can be reduced and the air contact angle increased, thereby maximizing hydrophilicity and realizing super-anaerobicity. In addition, the inflow of the electrolyte can be facilitated during the water electrolysis reaction, and performance can be maximized by inducing an increase in the contact area between the electrolyte and the catalyst. Furthermore, the super-anaerobicity of the water electrolysis electrode can be maximized by significantly reducing the diameter of the gas generated during the water electrolysis reaction.

[0061] The above method can be applied to the manufacture of alkaline water electrolysis electrodes or anion electrolyte membrane water electrolysis electrodes.

[0062]

[0063] Step a: Forming a non-precious metal-non-metal mixed catalyst layer on a conductive support

[0064] The above conductive support may be a material selected from the group consisting of commercially available metal foam, carbon cloth, and fabric materials, but is not limited thereto.

[0065] The above fabric material may include a carbonization process-based fabric material and a metal nanoparticle-based fabric material.

[0066] The above carbonization process-based fabric material refers to a conductive support formed by carbonization through heat treatment of a fabric material.

[0067] The above metal nanoparticle-based fabric material refers to a conductive support material in which conductivity is imparted by the lamination of conductive nanoparticles on a fabric material. Here, the conductive nanoparticles may include one or more selected from the group consisting of Cu, Ni, Fe, Co, Mg, and carbon nanotubes.

[0068] The above fabric material is a porous structure having pores formed by fibrill strands, and may include one or more selected from the group consisting of cotton fibers, silk, cellulose, polyester, nylon, and acrylic fibers, but is not necessarily limited thereto, and falls within the scope of the present invention as long as it corresponds to a porous structure according to a fibrill structure.

[0069] The conductive support above may have a minimum sheet resistance that allows for electroplating to form a non-precious metal-non-metal mixed catalyst layer described later, and the sheet resistance is preferably 104 Ω / sq or less.

[0070] The above non-precious metal-non-metal mixed catalyst layer can be formed on the conductive support by electroplating.

[0071] The above catalyst layer may have a nanostructure.

[0072] The non-precious metal in the above non-precious metal-non-metal mixed catalyst layer may include one or more selected from the group consisting of Ni, Co, Fe, Mo, V, W, and Cu, and the non-metal may include one or more selected from the group consisting of O, P, S, N, Se, and C.

[0073] The water electrolysis electrode according to the present invention can have dual functionality, allowing it to be used simultaneously as a reduction electrode for the hydrogen evolution reaction (HER) and an oxidation electrode for the oxygen evolution reaction (OER) by applying a non-precious metal-non-metal mixed catalyst layer.

[0074] In the case of the non-precious metal-non-metal mixed catalyst according to the present invention, the electrons delocalized due to the electronegativity difference between the non-precious metal and the non-metal are increased, making it possible to use it as a catalyst for both the reduction electrode and the oxidation electrode.

[0075] The dual-functional non-precious metal-non-metal mixed catalyst according to the present invention may be NiP. More specifically, NiP easily breaks the HO-H bond, and the decomposed intermediate H ad The hydrogen generation performance is excellent because P is adsorbed to the surface with appropriate strength, recombines into hydrogen, and is easily desorbed quickly. In addition, the oxygen generation performance is excellent because P induces electron transfer to Ni, thereby increasing catalytic activity, and contributes to the formation of NiOOH (nickel hydroxide), a key material for oxygen generation, by increasing delocalized electrons on the electrode surface. However, for application in actual water electrolysis systems, it must be possible to achieve super-anaerobicity on the electrode surface under high current conditions. To this end, the present invention applies a method of coating a hydrophilic organic material onto the non-precious metal-non-metal mixed catalyst layer, as described below.

[0076]

[0077] Step b: Step of modifying the surface with a hydrophilic organic material

[0078] In the present invention, a water electrolysis electrode having high hydrophilicity and super-anaerobicity, which are important factors in water electrolysis, was realized by coating a hydrophilic organic material on a non-precious metal-non-metal mixed catalyst layer to perform surface modification.

[0079] The above hydrophilic organic material may be an organic material having an amine group, and more preferably may be a monomolecular amine.

[0080] The organic material having the above amine group may include one or more selected from the group consisting of tris(2-aminoethyl)amine, hydrazine, diethylenetriamine, poly(ethylenimine), and poly(allylamine hydrochloride).

[0081]

[0082] In addition, the present invention provides a water electrolysis electrode comprising a non-precious metal-non-metal mixed catalyst layer formed on a conductive support. The mixed catalyst layer is characterized by having its surface modified by a hydrophilic organic material. Specific details regarding the conductive support, the non-precious metal-non-metal mixed catalyst layer, and the hydrophilic organic material are as described above.

[0083] The above-mentioned water electrolysis electrode may be a dual-function electrode applicable to both the cathode and the anode. The above-mentioned water electrolysis electrode may be an alkaline water electrolysis electrode.

[0084] In addition, the present invention can provide a water electrolysis device including the above-mentioned water electrolysis electrode.

[0085]

[0086] The present invention will be explained in more detail below through examples. The purpose, features, and advantages of the present invention will be easily understood through the following examples. The present invention is not limited to the examples described herein and may be embodied in other forms. The examples introduced herein are provided to ensure that the concept of the present invention is sufficiently conveyed to those skilled in the art to which the present invention pertains. Therefore, the present invention should not be limited by the following examples.

[0087]

[0088] Example 1. Preparation of a water electrolysis electrode

[0089] Minimum electrical conductivity (< 10) for depositing copper nanoparticles on an insulating fabric material (cotton fiber) via layered self-assembly and electroplating 3 A conductivity of ohm / sq) was achieved. At this time, a conductive support was prepared by performing Ni electroplating to secure electrical conductivity equivalent to that of bulk metal. The electroplating was performed at 250 mA / cm² in a Ni plating solution with a Watt bath composition (240 g / L NiSO₄, 45 g / L NiCl₂, 30 g H₃BO₃). 2 It proceeded with a current density of .

[0090] On the above conductive support, a non-precious metal-non-metal mixed catalyst NiP was electroplated in the following manner: specifically, the process was carried out by applying a voltage of -1 V in a NiP plating solution (10 mM NiCl2, 10 mM NaPO2H2, 15 mM NH4Cl, 15 mM CO(NH2)2).

[0091] As described above, a NiP catalyst layer was formed by electroplating, and then the electrode surface was modified with an organic material having a hydrophilic amine group to produce a super-anaerobic dual-function water electrolysis electrode based on a non-precious metal-non-metal mixed catalyst. Here, the electrode surface modification was performed by supporting a support with the formed NiP catalyst layer in a solution of tris(2-aminoethyl)amine dissolved in ethanol.

[0092]

[0093] Experimental Example 1. Analysis of Scanning Electron Microscope and EDX Images

[0094] Scanning electron microscope and EDX images of the super-anaerobic dual-function water electrolysis electrode fabricated according to Example 1 were analyzed, and the results are shown in Fig. 2. As shown in Fig. 2, it can be seen that the surface area is maximized through the micro-protrusion-nanoarray structure on the surface of the fabricated super-anaerobic dual-function water electrolysis electrode. Through such a structure, excellent water electrolysis performance can be secured and hydrophilicity can be maximized. This structure can be realized by uniformly coating a non-precious metal-non-metal mixed catalyst layer and a hydrophilic organic material, regardless of the type of support material.

[0095]

[0096] Experimental Example 2. Contact Angle Analysis

[0097] The characteristics of the water electrolysis electrode according to Example 1 were confirmed through contact angle analysis. As shown in Figure 3, it was confirmed that the water contact angle decreased and the air contact angle increased due to the coating of a non-precious metal-non-metal mixed nanostructure catalyst and a hydrophilic organic material. Through this, maximum hydrophilicity and super-anaerobicity can be realized. In addition, performance can be maximized by facilitating the inflow of the electrolyte during the water electrolysis reaction and simultaneously inducing an increase in the contact area between the electrolyte and the catalyst.

[0098]

[0099] Experimental Example 3. Analysis of Electrochemical Characteristics

[0100] The hydrogen / oxygen generation performance and the operating stability of the hydrogen / oxygen generation reaction of the water electrolysis electrode fabricated according to Example 1 were analyzed, and the results are shown in FIGS. 4 and 5. As shown in FIG. 4, the water electrolysis electrode fabricated through the present invention exhibited superior hydrogen generation performance compared to a precious metal platinum catalyst and superior oxygen generation performance compared to a precious metal iridium catalyst.

[0101] In FIG. 4, TREN / NiP2 is a water electrolysis electrode prepared according to Example 1, and NiP2 is a water electrolysis electrode in which surface modification by a monomeric amine is excluded from Example 1. Ni EP is a conductive support prepared according to Example 1, and Electroless NiP (EL NiP) is a water electrolysis electrode in which a catalyst layer is formed by electroless plating. Pt / C / Ni foam is a water electrolysis electrode in which platinum (Pt), a precious metal catalyst, is coated onto nickel foam by drop casting, and lrO2 / Ni foam is a water electrolysis electrode in which iridium (Ir), a precious metal catalyst, is coated onto nickel foam by drop casting.

[0102] In addition, as shown in Figure 5, it was confirmed that due to the super-anaerobic characteristics of the electrode of the present invention, hydrogen gas and oxygen gas generated during the water electrolysis reaction are rapidly desorbed from the electrode surface, exhibiting excellent performance even at high currents.

[0103]

[0104] Experimental Example 4. Analysis of the diameter of the generated hydrogen gas

[0105] (A) The diameter of hydrogen gas generated in nickel foam in a 1 M KOH electrolyte, (B) nickel foam plated with NiP, and (C) nickel foam coated with a monomolecular amine (Tris(2-aminoethyl)amine) after NiP plating was compared and analyzed, and the results are shown in Fig. 6.

[0106] (A) is data obtained by measuring the diameter of hydrogen gas and performing a size distribution when a hydrogen generation reaction was carried out using a sample corresponding to a conductive support as a water electrolysis electrode. (B) is data obtained by measuring the diameter of hydrogen gas and performing a size distribution when a hydrogen generation reaction was carried out using a sample electrolyzed with a non-precious metal-non-metal mixed catalyst, NiP, as a water electrolysis electrode on a conductive support. As shown in Figure 2, it can be confirmed that the diameter of the gas has decreased overall because NiP forms a nanostructure. (C) is data obtained by measuring the diameter of hydrogen gas and performing a size distribution when a hydrogen generation reaction was carried out using a sample prepared by the method according to the present invention as a water electrolysis electrode. It can be confirmed that the diameter of the gas has decreased significantly compared to (B) due to the influence of the hydrophilic monomeric amine material. Through this, it can be seen that the method according to the present invention can maximize the super-anaerobicity of the water electrolysis electrode and is a technology that can be universally utilized regardless of the type of conductive support.

[0107]

[0108] Experimental Example 5. Verification of water electrolysis reaction efficiency

[0109] The reaction efficiency of the water electrolysis electrode fabricated according to Example 1 was analyzed, and the results are shown in Figure 7. When the gas generated by configuring the dual-functional water electrolysis electrode fabricated according to Example 1 as a cathode and anode was captured, it was confirmed that no side reactions occurred and an efficiency of 99.5% or higher was exhibited.

Claims

1. A step of forming a non-precious metal-non-metal mixed catalyst layer on a conductive support (step a); and A method for manufacturing a water electrolysis electrode comprising the step (step b) of modifying the surface with a hydrophilic organic material thereafter.

2. In Claim 1, A method for manufacturing a water electrolysis electrode, characterized in that the conductive support is selected from the group consisting of metal foam, carbon cloth, and fabric material.

3. In Claim 2, A method for manufacturing a water electrolysis electrode characterized in that the fabric material is imparted conductivity through carbonization by heat treatment or imparted conductivity through the stacking of conductive nanoparticles.

4. In Claim 2, A method for manufacturing a water electrolysis electrode characterized in that the fabric material comprises one or more selected from the group consisting of cotton fibers, silk, cellulose, polyester, nylon, and acrylic fibers.

5. In Claim 1, The above step (a) is a method for manufacturing a water electrolysis electrode characterized by forming a non-precious metal-non-metal mixed catalyst layer by electroplating.

6. In Claim 1, A method for manufacturing a water electrolysis electrode, characterized in that the non-precious metal of the non-precious metal-non-metal mixed catalyst layer comprises one or more selected from the group consisting of Ni, Co, Fe, Mo, V, W, and Cu, and the non-metal comprises one or more selected from the group consisting of O, P, S, N, Se, and C.

7. In Claim 1, A method for manufacturing a water electrolysis electrode characterized in that the catalyst layer has a nanostructure.

8. In Claim 1, A method for manufacturing a water electrolysis electrode characterized by performing the above step (b) by coating with a hydrophilic organic material.

9. In Claim 1, A method for manufacturing a water electrolysis electrode characterized in that the above-mentioned hydrophilic organic material is an organic material having an amine group.

10. In Claim 9, A method for manufacturing a water electrolysis electrode, characterized in that the organic material having the above amine group comprises one or more selected from the group consisting of tris(2-aminoethyl)amine, hydrazine, diethylenetriamine, poly(ethylenimine), and poly(allylamine hydrochloride).

11. In Claim 1, The above method is a method for manufacturing a water electrolysis electrode characterized by forming a non-precious metal-non-metal mixed catalyst layer and then modifying the surface with a hydrophilic organic material to reduce the water contact angle and increase the air contact angle.

12. In Claim 1, A method for manufacturing a water electrolysis electrode characterized by applying the above method to the manufacture of an alkaline water electrolysis electrode or an anion electrolyte membrane water electrolysis electrode.

13. A water electrolysis electrode comprising a non-precious metal-non-metal mixed catalyst layer formed on a conductive support, wherein the surface of the mixed catalyst layer is modified by a hydrophilic organic material.

14. In Claim 13, The above electrode is a water electrolysis electrode characterized by being a dual-function electrode applicable to both the cathode and the anode.

15. In Claim 13, The above electrode is an electrolytic electrode characterized by being an alkaline water electrolysis electrode.

16. A water electrolysis device comprising a water electrolysis electrode according to any one of claims 13 to 15.

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