Catalyst electrode for ammonia water electrolysis having durability improved by heat treatment, and method for producing same

Abstract

Disclosed are a catalyst electrode for ammonia electrolysis and a method for effectively producing same, wherein the ratio of oxides and hydroxides in the catalyst electrode for ammonia water electrolysis is improved by introducing a heat treatment step for heat treatment within a specific temperature range after an electroplating step, and as a result, poisoning by nitrogen oxides is suppressed such that durability is improved, and excellent ammonia water electrolysis performance is achieved.

Description

Ammonia water electrolysis catalyst electrode with improved durability through heat treatment and method for manufacturing the same

[0001] The present invention relates to a catalyst electrode for ammonia electrolysis and a method for manufacturing the same, and more particularly, to a catalyst electrode for ammonia electrolysis whose durability is improved by heat treatment and a method for manufacturing the same.

[0002] This application claims priority to and the benefit of Republic of Korea Patent Application No. 10-2023-0178841, filed December 11, 2023, which is incorporated herein by reference in its entirety.

[0003] Ammonia, the nitrogen compound with the lowest oxidation state, can be generated directly in various industrial processes or as part of the nitrogen cycle during the treatment of nitrate nitrogen compounds. Ammonia can be treated through degassing, biological decomposition, chlorination, and electrochemical decomposition. Among these, electrochemical oxidation has recently attracted significant attention due to its economic feasibility, rapid and simple operation, and minimal secondary waste generation.

[0004] Existing technologies for hydrogen production using ammonia include thermal decomposition of ammonia and electrolytic decomposition of aqueous ammonia solutions. Thermal decomposition of ammonia simultaneously produces nitrogen and hydrogen, requiring expensive palladium membranes to separate high-purity hydrogen. This limits productivity and economic feasibility. Furthermore, little research has been conducted on electrolytic decomposition of aqueous ammonia solutions, particularly on the development of electrodes suitable for the electrolysis of aqueous ammonia solutions. Therefore, the development of electrodes effective for the electrolysis reaction of aqueous ammonia solutions is necessary.

[0005] Meanwhile, unlike water electrolysis, which theoretically requires 1.23 V, ammonia electrolysis, which requires only 0.06 V, is highly promising as a source of hydrogen fuel. Among the widely used catalysts, transition metal catalysts, excluding precious metals like platinum and iridium, suffer from extremely high overvoltages, hindering widespread use. However, platinum-based catalyst materials face challenges due to their high cost, making them difficult to achieve economic feasibility.

[0006] In addition, the ammonia electrolysis reaction has a problem in that the electrode activity is deactivated within minutes to hours due to poisoning by nitrogen oxides, which are reactants or intermediate products, thereby reducing the durability of the catalyst electrode.

[0007] Korean Patent Publication No. 10-2022-0068566 (May 26, 2022) relates to a hydrogen production device using an aqueous ammonia solution. It manufactures and uses an electrode in which platinum is deposited on a nickel metal foam, but does not mention a technology for improving the durability of the catalyst electrode through heat treatment.

[0008] In addition, Yejin Yang et al. (JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.19, May 2021, pp.11571-11579) disclosed a technology for using platinum as an ammonia oxidation catalyst by electrochemically depositing it on carbon paper using a potential cycling method, but they did not mention a technology for improving the durability of the catalyst electrode through heat treatment.

[0009] The present invention aims to provide an ammonia electrolysis catalyst electrode having improved durability while maintaining ammonia electrolysis activity, and a method for effectively manufacturing the same.

[0010] In order to solve the above problem, the present invention provides a method for manufacturing a catalyst electrode for ammonia electrolysis, comprising the steps of (A) manufacturing a catalyst by electroplating an active metal on a support surface; and (B) heat-treating the catalyst.

[0011] In addition, a method for manufacturing a catalyst electrode for ammonia electrolysis is provided, characterized in that the heat treatment temperature in the step (B) is 50 to 250°C.

[0012] In addition, the present invention provides a method for manufacturing a catalyst electrode for ammonia electrolysis, characterized in that the support comprises at least one material selected from the group consisting of nickel, iron, aluminum, and carbon, and the active metal catalyst comprises at least one material selected from the group consisting of platinum, iridium, rhodium, palladium, ruthenium, iron, nickel, cobalt, and manganese.

[0013] In addition, the support includes nickel, the active metal catalyst is platinum, and the ratio of nickel oxide (NiO) and nickel hydroxide (Ni(OH)2) in the ammonia-water electrolysis catalyst electrode is 1:4 to 1:9 through the heat treatment in step (B), and a method for manufacturing an ammonia-water electrolysis catalyst electrode is provided.

[0014] In order to solve the above-mentioned further problem, the present invention provides a catalyst electrode for ammonia electrolysis manufactured by the above-mentioned method.

[0015] The present invention provides an ammonia electrolysis catalyst electrode, wherein the ratio of nickel oxide and nickel hydroxide in the ammonia electrolysis catalyst electrode is improved by introducing a heat treatment step within a specific temperature range after an electroplating process, thereby suppressing poisoning by nitrogen oxides and improving durability, and providing an ammonia electrolysis catalyst electrode having excellent ammonia electrolysis performance and a method for effectively manufacturing the same.

[0016] Figure 1 is a photograph showing the results of an SEM analysis performed on a catalyst electrode for ammonia electrolysis manufactured according to examples and comparative examples of the present invention.

[0017] Figure 2 is a graph showing the results of measuring ammonia oxidation characteristics for a catalyst electrode for ammonia electrolysis manufactured according to examples and comparative examples of the present invention.

[0018] Figure 3 is a graph showing the results of evaluating the electrochemical stability of ammonia water electrolysis catalyst electrodes manufactured according to examples and comparative examples of the present invention.

[0019] Figure 4 is a graph showing the results of analysis of surface chemical species and chemical bonding energy of an ammonia water electrolysis catalyst electrode manufactured according to Example 1 of the present invention.

[0020] Figure 5 is a graph showing the results of analysis of surface chemical species and chemical bonding energy of an ammonia water electrolysis catalyst electrode manufactured according to a comparative example in the present invention.

[0021] Figure 6 is a graph showing the results of analysis of surface chemical species and chemical bonding energy of an ammonia water electrolysis catalyst electrode manufactured according to Example 4 of the present invention.

[0022] Hereinafter, the present invention will be described in detail through preferred embodiments. Prior to this, it should be noted that the terms and words used in this specification and claims should not be interpreted as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concept of a term to best explain his or her invention, they should be interpreted as meanings and concepts that are consistent with the technical concept of the present invention. Therefore, the configuration of the embodiments described in this specification is only the most preferred embodiment of the present invention and does not represent the entire technical concept of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of filing this application.

[0023]

[0024] The present invention discloses a method for manufacturing a catalyst electrode for ammonia electrolysis, comprising the steps of (A) manufacturing a catalyst by electroplating an active metal on a support surface; and (B) heat-treating the catalyst.

[0025] The support may comprise at least one material selected from the group consisting of nickel, iron, aluminum carbon, and nickel-based alloys. The support serves as a substrate on which the active metal catalyst is formed, and a nickel material may preferably be used.

[0026] In the present invention, the shape of the support is not particularly limited, but may be in the shape of a foam, plate, fabric, foil, or felt, and preferably, it may be a metal foam support. When the support is a metal foam support, the stability of the electrode, the amount of catalyst supported, and the mobility of the electrolyte can be effectively increased, and the area of ​​the electrode catalyst particles, such as platinum particles, can be increased, thereby enhancing the electrode activity.

[0027] In one specific embodiment of the present invention, the metal foam support may be a nickel-based foam support. When the metal foam support is a nickel-based foam support, more stable support of active metal particles and effective catalytic activity of the active metal particles can be exhibited.

[0028] In the present invention, the active metal catalyst attached to the support is not particularly limited as long as it is a metal catalyst that functions as a catalyst for the oxidation reaction of ammonia electrolysis, but may be, for example, a noble metal catalyst such as platinum, iridium, rhodium, palladium, ruthenium, etc., and a non-noble metal catalyst such as iron, nickel, cobalt, manganese, etc., and may preferably be a platinum catalyst in that it can promote the adsorption of ammonia in the ammonia oxidation reaction and greatly improve the electrolysis efficiency of the ammonia aqueous solution.

[0029] In addition, the precursor of the above active metal catalyst is a compound containing an active metal catalyst such as platinum, iridium, rhodium, palladium, ruthenium, iron, nickel, cobalt, manganese, etc., and for example, as a precursor for platinum active metal electroplating, chloroplatinic acid (H2PtCl) 6ㆍ xH2O) can be used.

[0030] In addition, the precursor of the active metal catalyst may be included in the solution in step (A) at a concentration of 0.5 to 20 mM, and preferably at a concentration of 1 to 5 mM. If the active metal catalyst precursor is less than the above concentration range, the amount of deposited active metal catalyst may not be sufficient, resulting in a decrease in ammonia electrolysis activity. In addition, if the concentration of the metal catalyst precursor is higher than the above concentration range, the mass activity may be decreased due to excessive formation of agglomerated metal particles.

[0031] The above step (A) is a step of electroplating the active metal catalyst on the surface of the support by applying voltage to a solution containing a support, a precursor of an active metal catalyst, and an electrolyte, so that even a small amount of the active metal catalyst is uniformly deposited over a wide surface area, thereby allowing an excellent ammonia oxidation reaction to occur at more active sites.

[0032] The electrolyte is not particularly limited as long as it is a salt that allows the active metal catalyst to be transferred and deposited from the active metal catalyst precursor to the support, and for example, HClO4, H2SO4, HCl, NaCl, KCl, KOH, NaOH, etc. can be used, and when considering the deposition efficiency and the shape of the active metal, HClO4 can be preferably used.

[0033] The electrolyte may be included in the solution in step (A) at a concentration of 0.5 to 5000 mM, preferably at a concentration of 5 to 3000 mM, and more preferably at a concentration of 100 to 1000 mM. If the electrolyte is less than the above concentration range, the movement of the metal precursor in the electrolyte may not be smooth, so the amount of the metal catalyst supported may not be sufficient, and if the electrolyte is higher than the above concentration range, the oxidation of the metal support may be accelerated, so that the ammonia electrolysis activity may decrease.

[0034] In the electroplating process in the above step (A), the voltage may be -1.0 to 1.0 V (vs. Ag / AgCl), preferably -0.5 to 0.8 V (vs. Ag / AgCl), and more preferably -0.2 to 0.4 V (vs. Ag / AgCl), and the electroplating time may be 1 minute to 3 hours, preferably 5 minutes to 2 hours, and more preferably 10 minutes to 1 hour. In particular, when the electroplating time is less than 1 minute, the amount of the deposited active metal catalyst may not be sufficient, and when the electrodeposition time exceeds 3 hours, the amount of the deposited active metal catalyst may be excessive, which may reduce the economic feasibility of manufacturing the ammonia electrolysis catalyst electrode.

[0035] In the present invention, the step (B) is a step of heat-treating the catalyst manufactured in the step (A), and by the heat treatment, an oxide of the metal forming the support in the ammonia-water electrolysis catalyst electrode is formed, so that poisoning by nitrogen oxides generated in the ammonia-water electrolysis reaction can be prevented, thereby improving durability. Therefore, the step (B) serves to improve the durability of the ammonia-water electrolysis catalyst electrode manufactured in the present invention.

[0036] In addition, the type of heat treatment device used in the heat treatment is not particularly limited, but a tube furnace can be used, and the treatment conditions of the heat treatment device are specifically set to 50 to 250°C and can be treated for 5 minutes to 12 hours, and in terms of maximizing the durability of the ammonia-water electrolysis catalyst electrode, it is preferably set to 70 to 230°C and can be treated for 10 minutes to 6 hours, and more preferably, it is set to 90 to 210°C and can be treated for 30 minutes to 3 hours.

[0037] Meanwhile, if the temperature of the heat treatment device is less than 50°C, the effect of improving the durability of the catalyst electrode may be minimal, and if the temperature of the heat treatment device exceeds 250°C, the active metal catalyst may clump together, reducing the exposure of active sites and thus lowering the ammonia electrolysis activity.

[0038] In addition, if the heat treatment time is less than 5 minutes, the effect of improving the durability of the catalyst electrode may be minimal, and if the heat treatment time exceeds 12 hours, the metal oxide support present in the catalyst may be deformed, thereby reducing the ammonia electrolysis activity.

[0039] According to one specific example of the present invention, a method for manufacturing an ammonia-water electrolysis catalyst electrode can be provided, characterized in that the support in the step (A) includes nickel, the active metal catalyst is platinum, and the ratio of nickel oxide (NiO) and nickel hydroxide (Ni(OH)2) in the ammonia-water electrolysis catalyst electrode is 1:4 to 1:9 by heat treatment in the step (B).

[0040] Meanwhile, if the ratio of nickel oxide (NiO) and nickel hydroxide (Ni(OH)2) is outside the above range, the hydrophilicity of the electrode surface may change. If the ratio of nickel oxide is high, the surface hydrophilicity is low, so the adsorption of ammonia, which is a reactant, is not smooth, which may reduce the ammonia decomposition performance. In addition, as the nickel oxide ratio increases through the high-temperature heat treatment process, agglomeration of the active metal may occur, which may also reduce the durability of ammonia electrolysis. If the ratio of nickel hydroxide is high, the adsorption of ammonia is smooth, improving the ammonia decomposition performance, but the durability may be reduced due to excessive adsorption of ammonia.

[0041] That is, in terms of maximizing ammonia decomposition performance and catalyst electrode durability, the ratio of nickel oxide and nickel hydroxide in the ammonia-water electrolysis catalyst electrode is preferably 1:4 to 1:9, and more preferably 1:5.6 to 1:9.

[0042] In addition, the present invention can provide an ammonia electrolysis catalyst electrode having improved durability manufactured by the above method.

[0043] According to the present invention, by treating the result of electroplating the active metal catalyst on the support with the heat treatment device at a specific temperature and time, the ratio of nickel oxide and nickel hydroxide in the ammonia electrolysis catalyst electrode can be changed, and as the ratio of nickel oxide and nickel hydroxide is changed, poisoning by nitrogen oxides can be prevented, and it was confirmed through the test examples described below that the durability of the catalyst electrode can be improved.

[0044] Hereinafter, the present invention will be described in more detail through specific examples and comparative examples.

[0045]

[0046] Example 1

[0047] A nickel support (MTI Korea, nickel thickness 1600 ㎛, porosity 50 to 98%) measuring 1 cm in width and 1 cm in length was prepared by mixing chloroplatinic acid (H2PtCl), which is an active metal catalyst precursor. 6ㆍ The platinum catalyst was deposited on the surface of the nickel support by placing it in a solution containing 2 mM xH2O and 100 mM electrolyte HClO4 and applying a voltage of -0.2 to 0.4 V (vs. Ag / AgCl) for 50 minutes.

[0048] The electroplated result was washed five times with distilled water, dried, and then heat-treated for 1 hour in a heat treatment device (FU-PK-G4-L, purchased from Samheung Energy, with a heating rate fixed at 2.5°C / min) set at 100°C in an argon atmosphere to manufacture a catalyst electrode for ammonia electrolysis.

[0049]

[0050] Example 2

[0051] An ammonia-water electrolysis catalyst electrode was manufactured in the same manner as in Example 1, except that the heat treatment temperature was set to 200°C.

[0052]

[0053] Example 3

[0054] An ammonia-water electrolysis catalyst electrode was manufactured in the same manner as in Example 1, except that the heat treatment temperature was set to 300°C.

[0055]

[0056] Example 4

[0057] An ammonia-water electrolysis catalyst electrode was manufactured in the same manner as in Example 1, except that the heat treatment temperature was set to 400°C.

[0058]

[0059] Comparative example

[0060] An ammonia-water electrolysis catalyst electrode was manufactured in the same manner as in Example 1, except that heat treatment was not performed in Example 1.

[0061]

[0062] Test Example 1

[0063] In order to confirm the effect of heat treatment on the surface of the ammonia water electrolysis catalyst electrode in the present invention, scanning electron microscope (SEM) analysis was performed on the ammonia water electrolysis catalyst electrodes manufactured according to the examples and comparative examples, and the results are shown in Fig. 1.

[0064] Referring to Fig. 1, in the case of an ammonia electrolysis catalyst electrode that was not heat-treated (comparative example), platinum nanoparticles on the surface showed a multilayer structure (see left photo), and in the case of an ammonia electrolysis catalyst electrode that was heat-treated at 100 to 300°C (Examples 1 to 3), platinum nanoparticles on the surface showed a rough shape (see middle photo), and in the case of an ammonia electrolysis catalyst electrode that was heat-treated at 400°C (Example 4), platinum nanoparticles were confirmed to be eluted from the surface in an aggregated form (see right photo).

[0065] Meanwhile, the agglomerated form of the platinum nanoparticles in Example 4 is a result of the characteristic of transforming into a form in which surface exposure is minimized to lower the surface energy of the particles as the high-temperature heat treatment of 400°C or higher is performed. As a result, the platinum catalyst area on the surface is reduced due to the agglomerated form, and it is expected that the catalytic activity of the ammonia-water electrolysis catalyst electrode may be reduced.

[0066]

[0067] Test Example 2

[0068] In order to confirm the change in ammonia oxidation activity of the ammonia-water electrolysis catalyst electrode according to the heat treatment in the present invention, the ammonia oxidation characteristics were measured for the ammonia-water electrolysis catalyst electrodes manufactured according to the Examples and Comparative Examples, and the results are shown in Fig. 2. All electrochemical measurements for ammonia oxidation were performed using an electrochemical workstation (Zive, WonA Tech). Specifically, the electrolyte was 1 M NH4OH / 5 M KOH, and the electrochemical tests were performed in a three-electrode system in a sealed glass beaker without a membrane (to prevent evaporation of ammonia), using a Hg / HgO electrode (filling solution: 1.0 M KOH) and a Pt mesh as the reference and reference electrodes, respectively. The cyclic voltammetry (CV) curves of the catalysts were obtained from -0.15 V to 1.2 V vs. RHE at a scan rate of 20 mV / s. Additionally, all potentials measured for Hg / HgO using Pt mesh as electrode and Hg / HgO as reference electrode in a hydrogen atmosphere were converted to the RHE (reversible hydrogen electrode) scale according to the following mathematical equation 1.

[0069] [Mathematical Formula 1]

[0070] V RHE = V Hg / HgO + 0.97 (experimental measurement)

[0071] Referring to Figure 2, the ammonia oxidation catalyst performance is 520 mA / cm for the ammonia water electrolysis catalyst electrode manufactured according to the comparative example. 2 , the ammonia water electrolysis catalyst electrode manufactured according to Example 1 was 500 mA / cm 2 , the ammonia water electrolysis catalyst electrode manufactured according to Example 2 was 550 mA / cm 2 , the ammonia water electrolysis catalyst electrode manufactured according to Example 3 was 530 mA / cm 2 , the ammonia water electrolysis catalyst electrode manufactured according to Example 4 was 230 mA / cm 2In this way, the ammonia oxidation catalyst performance was confirmed to be at a similar level to the comparative example in the case of Examples 1 to 3, and was confirmed to be reduced by about 50% compared to the comparative example in the case of Example 4. It is presumed that the result of Example 4 is due to the reduction in platinum particle exposure as described above in Test Example 1.

[0072]

[0073] Test Example 3

[0074] In order to confirm the change in stability of the ammonia water electrolysis catalyst electrode according to heat treatment in the present invention, the electrochemical stability of the ammonia water electrolysis catalyst electrode manufactured according to the examples and comparative examples was evaluated under the following conditions, and the results are shown in Fig. 3.

[0075] [Evaluation Conditions]

[0076] - Use 1 M NH4OH / 5 M KOH electrolyte, stirring at 200 rpm.

[0077] - 50 mA / cm 2 The constant current test was conducted at room temperature, and the time for water oxidation reaction to occur due to catalyst poisoning was measured.

[0078] Referring to FIG. 3, the electrochemical stability of the catalyst electrode was measured as 14 hours for the ammonia water electrolysis catalyst electrode manufactured according to the comparative example, 46 hours for the ammonia water electrolysis catalyst electrode manufactured according to Example 1, 48 hours for the ammonia water electrolysis catalyst electrode manufactured according to Example 2, 17 hours for the ammonia water electrolysis catalyst electrode manufactured according to Example 3, and 20 minutes for the ammonia water electrolysis catalyst electrode manufactured according to Example 4. In particular, it was confirmed that the electrochemical stability or durability of Examples 1 and 2 was improved by more than twice compared to the comparative example.

[0079]

[0080] Test Example 4

[0081] In order to confirm the factors for improving the durability of the ammonia electrolysis catalyst electrode according to heat treatment in the present invention, the ammonia electrolysis catalyst electrode manufactured according to Example 1, the ammonia electrolysis catalyst electrode manufactured according to Comparative Example, and the ammonia electrolysis catalyst electrode manufactured according to Example 4 were analyzed for changes in the oxidation numbers of platinum and nickel on the surface using X-ray photoelectron spectroscopy, and the results are shown in FIGS. 4 to 6, respectively, and the surface chemical species and chemical bonding energies corresponding to the peaks in each figure are shown in Tables 1 to 3 below.

[0082] Surface chemical species of the 100°C heat-treated catalyst electrode according to Example 1 Chemical binding energy (eV) NiO, Ni 2p 3 / 2852.95 Ni(OH)2, Ni 2p 3 / 2855.98 Ni(OH)2, Ni 2p 1 / 2873.64

[0083] Surface chemical species of catalyst electrodes that were not subjected to heat treatment according to comparative examples Chemical binding energy (eV) NiO, Ni 2p 3 / 2853.50 Ni(OH)2, Ni 2p 3 / 2855.60 Ni(OH)2, Ni 2p 1 / 2873.18

[0084] Surface chemical species of the 400°C heat-treated catalyst electrode according to Example 4 Chemical binding energy (eV) NiO, Ni 2p 3 / 2854.19 Ni(OH)2, Ni 2p 3 / 2856.00 NiO, Ni 2p 1 / 2871.75 Ni(OH)2, Ni 2p 1 / 2873.38

[0085]

[0086] Referring to FIGS. 4 and 5 and Tables 1 and 2 above, a change in the binding energy position corresponding to Ni 2p was observed in the case of the ammonia-water electrolysis catalyst electrode manufactured according to Example 1 in which heat treatment was performed, compared to the ammonia-water electrolysis catalyst electrode manufactured according to the comparative example in which heat treatment was not performed.

[0087] Also, referring to FIG. 6 and Table 3 above, it can be seen that when heat-treated at an excessively high temperature of 400°C, NiO species grow excessively, with a peak area exceeding 20% ​​in X-ray photoelectron analysis. It is expected that the Pt-Ni(OH)2 interaction maintained at low temperatures weakens during high-temperature heat treatment, and the Ni(OH)2 species transforms into NiO species.

[0088] That is, it was confirmed through the analysis results using X-ray photoelectron spectroscopy that when the heat treatment temperature exceeds 400℃, the agglomeration phenomenon of the active metal catalyst occurs, which reduces the exposure of the active site and thus reduces the ammonia electrolysis activity.

[0089] This means that the ratio of nickel oxide (NiO) and nickel hydroxide (Ni(OH)2) changes as the heat treatment proceeds in a specific temperature range, and since the poisoning phenomenon by nitrogen oxide described above can be prevented when the nickel oxide is contained in the above-described preferable ratio, it is expected that the durability of the catalyst electrode for ammonia water electrolysis can be improved by the heat treatment in the present invention.

[0090]

[0091] The preferred embodiments of the present invention have been described in detail above. The description of the present invention is provided for illustrative purposes only, and those skilled in the art will readily appreciate that other specific modifications can be readily made without altering the technical spirit or essential features of the present invention.

[0092] Accordingly, the scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning, scope and equivalent concepts of the claims should be interpreted as being included in the scope of the present invention.

Claims

1. (A) a step of preparing a catalyst by electroplating an active metal on the surface of a support; and (B) a step of heat treating the catalyst; A method for manufacturing a catalyst electrode for ammonia water electrolysis comprising:

2. In paragraph 1, A method for manufacturing a catalyst electrode for ammonia-water electrolysis, characterized in that the heat treatment temperature in the above step (B) is 50 to 250°C.

3. In paragraph 1, The support comprises at least one material selected from the group consisting of nickel, iron, aluminum and carbon, A method for manufacturing a catalyst electrode for ammonia-water electrolysis, characterized in that the active metal catalyst is at least one selected from the group consisting of platinum, iridium, rhodium, palladium, ruthenium, iron, nickel, cobalt, and manganese.

4. In paragraph 1, The above support comprises nickel, The above active metal catalyst is platinum, A method for manufacturing an ammonia-water electrolysis catalyst electrode, characterized in that the support of the ammonia-water electrolysis catalyst electrode is made of nickel oxide (NiO) and nickel hydroxide (Ni(OH)2) in a ratio of 1:4 to 1:9 through heat treatment in the step (B).

5. A catalyst electrode for ammonia electrolysis manufactured according to any one of claims 1 to 4.

Images