Trace noble metal modified NiMo catalyst, its preparation method and application

Abstract

The application relates to a trace noble metal modified NiMo catalyst and a preparation method and application thereof, relates to a bifunctional molybdenum-nickel-based electrocatalyst, and aims to solve the technical problems of high cost and low efficiency of existing water electrolysis hydrogen production catalysts. The catalyst is micrometer-level square columnar molybdenum-nickel alloy microcrystals in situ grown on a foam nickel substrate, and the surface of the molybdenum-nickel alloy microcrystals is attached with noble metal elemental osmium, ruthenium or iridium. The preparation method comprises the following steps: placing the foam nickel in a mixed solution of nickel nitrate and ammonium molybdate for hydrothermal reaction, then dropping a noble metal salt solution on the surface of the foam nickel, and annealing at high temperature to obtain the trace noble metal modified NiMo catalyst. The catalyst has a HER side overpotential of only 11.6 mV and an OER side overpotential of only 243.8 mV under an electric current density of 10 mAcm ‑2 2 in alkaline seawater. The HER stability in seawater is over 1000 h, the OER stability is over 1000 h, and the catalyst can be used in the field of seawater electrolysis hydrogen production.

Description

TECHNICAL FIELD

[0001] The present application relates to a bifunctional molybdenum-nickel-based electrocatalyst, and belongs to the technical field of new energy materials and the field of hydrogen production by water electrolysis. BACKGROUND

[0002] Hydrogen has a high energy density of 120 kJ / g, and can be used as an industrial raw material and an energy carrier. It is clean, non-polluting, and safe, and is an ideal bridge for the transition from fossil energy to clean energy. Hydrogen production is particularly important for promoting the development of the hydrogen energy industry. Among all routes for producing hydrogen energy, hydrogen production from inexpensive and renewable energy is the most effective approach, and water electrolysis (especially seawater electrolysis) is an effective way to continuously obtain hydrogen energy. The current mature commercial water electrolysis systems include alkaline electrolysis cells (ALK), proton exchange membrane electrolysis cells (PEM), high-temperature solid oxide electrolysis cells (SOEC), and anion exchange membrane electrolysis cells (AEM). More than 50% of the cost of these electrolysis cells comes from the preparation of bipolar plates (catalyst layers). For example, the proton exchange membrane of the cathode of a PEM needs to be hot-pressed or transferred with a platinum and iridium slurry to obtain, and the prices of metals such as platinum and iridium are high. In addition, the hot-pressing and transfer printing processes require additional investment, further increasing the cost and limiting large-scale commercialization. In addition to the cost problem, the problem of electrolysis raw materials also needs to be considered. Both alkaline electrolysis cells and proton exchange membrane electrolysis cells use high-purity water as raw material. If high-purity water is used for electrolysis to produce most of the world's hydrogen energy in the future, the consumption of fresh water cannot be completely ignored. In contrast, seawater accounts for 96.5% of the world's water reserves and is an almost unlimited resource. Compared with electrolysis of fresh water, seawater electrolysis faces more challenges, such as the toxic effects of impurity ions, the competition of chlorine ion oxidation reactions, and corrosion caused by a decrease in the local pH value in seawater. Therefore, the development of a catalyst with high activity and long-term service life in seawater is the key to the development of seawater hydrogen production. Currently, noble metal-based catalysts are commonly used in the anode (HER side) of commercial electrolysis cells, and platinum and iridium are commonly used in the cathode (OER side). However, the limited reserves and high prices of these metals have increased the cost of commercialization. SUMMARY

[0003] The present application aims to solve the technical problems of high cost and low efficiency of the existing water electrolysis hydrogen catalyst, and provides a trace noble metal modified NiMo catalyst, a preparation method and application thereof. The catalyst prepared by the method is a simple doped modified trace noble metal modified NiMo catalyst. The catalyst can be used for anode (hydrogen evolution) and cathode (oxygen evolution) catalysis at the same time. The catalyst realizes an ultra-long stability of more than 1000 hours on the HER side, more than 1000 hours on the OER side, and more than 1000 hours as the HER and OER at the same time under the condition of alkaline seawater. The special anchoring method is used to anchor the trace Os on the surface of the NiMo nanocube to electrolyze seawater to produce hydrogen under the industrial current density.

[0004] The trace noble metal modified NiMo catalyst of the present application is based on foam nickel, and micrometer-level square columnar molybdenum-nickel alloy microcrystals are grown in situ on the surface of the foam nickel. The surface of the molybdenum-nickel alloy microcrystals is attached with noble metal elements. The noble metal elements are osmium, ruthenium or iridium.

[0005] The preparation method of the trace noble metal modified NiMo catalyst of the present application is carried out according to the following steps:

[0006] I. The foam nickel is sequentially subjected to ultrasonic treatment in an organic solvent and dilute acid, and then cleaned with anhydrous ethanol to obtain clean foam nickel.

[0007] II. A metal salt solution is prepared by using Ni(NO3)2·6H2O and (NH4)2MoO4·4H2O, and is transferred to a hydrothermal synthesis reaction kettle. The clean foam nickel is immersed in the metal salt solution. After the reaction kettle is sealed, it is placed in a furnace at a temperature of 150-200℃ for hydrothermal reaction for 6-8h. After the reaction is completed, the foam nickel is taken out and cleaned to obtain foam nickel with micrometer-level square columnar nickel molybdate crystals grown in situ on the surface.

[0008] III. A noble metal salt solution is prepared, and the noble metal salt solution is added dropwise on the surface of the foam nickel obtained in step II. After drying, a precursor is obtained. The noble metal salt solution is an osmium chloride, ruthenium chloride or sodium chloroiridate solution.

[0009] IV. The precursor is placed in a high-temperature furnace under a mixed atmosphere of hydrogen and argon, heated to 400-600℃ and kept for 2-3h for high-temperature annealing to obtain a trace noble metal modified NiMo catalyst.

[0010] Preferably, the organic solvent in step I is one or more of ethanol, acetone, isopropyl ketone and ethylene glycol.

[0011] Preferably, the dilute acid in step I is hydrochloric acid with a concentration of 6-10mol / L.

[0012] Preferably, the molar ratio of Ni(NO3)2.6H2O to (NH4)2MoO4.4H2O in the metal salt solution in step two is 1:(2-10), and the concentration of Ni(NO3)2.6H2O in the metal salt solution is 0.25-3.3 mmol / mL.

[0013] Preferably, the concentration of the noble metal salt solution in step three is 1-10 mmol / L.

[0014] Preferably, the drying in step three is natural drying or vacuum drying at a temperature of 20-80 DEG C for 2-15 h.

[0015] Preferably, the volume ratio of hydrogen to argon in the mixed gas atmosphere of hydrogen and argon in step four is 1:(15-25).

[0016] The application of the trace noble metal modified NiMo catalyst described above is to use the trace noble metal modified NiMo catalyst in the hydrogen production by large-current electrolysis of seawater.

[0017] The micro-morphology of the trace noble metal modified NiMo catalyst of the application is a micron-sized molybdenum-nickel alloy microcrystal square column grown in situ, and the microcrystal surface is attached with noble metal elements, which provides a large number of active sites for the catalyst, and is a noble metal doped molybdenum-nickel-based electrocatalyst.

[0018] The preparation method of the application stepwisely constructs noble metal elements and nickel-molybdenum alloy catalytic active sites on a nickel foam substrate, and has the advantages of simple preparation method and low cost.

[0019] The trace noble metal modified NiMo catalyst of the application has a HER side overpotential of only 11.6 mV and an OER side overpotential of only 243.8 mV at a current density of 10 mA / cm 2 in 1M KOH seawater.

[0020] The trace noble metal modified NiMo catalyst of the application is a bifunctional catalyst, and has better electrochemical catalytic performance than commercial RuO2 and Pt / C electrodes in the aspect of seawater full decomposition. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 SEM image of Os-Ni4Mo / MoO2 prepared in Example 1 at a scale of 300 μm;

[0022] Figure 2SEM image of Os-Ni4Mo / MoO2 prepared in Example 1 at the 10 μm scale;

[0023] Figure 3 SEM image of Os-Ni4Mo / MoO2 prepared in Example 1 at the 5 μm scale;

[0024] Figure 4 TEM image of Os-Ni4Mo / MoO2 prepared in Example 1;

[0025] Figure 5 Comparison of XRD characterization results of Os-Ni4Mo / MoO2 prepared in Example 1 with standard card;

[0026] Figure 6 Hydrogen evolution polarization curves of Os-Ni4Mo / MoO2 prepared in Example 1 and the comparative catalyst;

[0027] Figure 7 The Os-Ni4Mo / MoO2 prepared in Example 1 was subjected to an amplitude of 500 mA / cm². 2 A graph showing the change of electric potential over time under constant current;

[0028] Figure 8 The hydrogen evolution polarization curve of Os-Ni4Mo / MoO2 prepared in Example 1 in seawater;

[0029] Figure 9 The Os-Ni4Mo / MoO2 prepared in Example 1 was in seawater at -100 mA / cm 2 -200mA / cm 2 -300mA / cm 2 -400mA / cm 2 -500mA / cm 2 A graph showing the change of electric potential over time under constant current;

[0030] Figure 10 Oxygen evolution polarization curves of Os-Ni4Mo / MoO2 prepared in Example 1 and the comparative catalyst;

[0031] Figure 11 The Os-Ni4Mo / MoO2 prepared in Example 1 was subjected to an amplitude of 500 mA / cm². 2 A graph showing the change of electric potential over time under constant current;

[0032] Figure 12 The oxygen evolution polarization curve of Os-Ni4Mo / MoO2 prepared in Example 1 in seawater;

[0033] Figure 13Os-Ni4Mo / MoO2 prepared for Example 1 in seawater at 500 mA / cm 2 Potential vs. time at constant current plot;

[0034] Figure 14 Polarization plot for Os-Ni4Mo / MoO2 prepared for Example 1 as both cathode and anode;

[0035] Figure 15 Potential vs. time at constant current plot for Os-Ni4Mo / MoO2 prepared for Example 1 as both cathode and anode in seawater at 500 mA / cm 2 Potential vs. time at constant current plot;

[0036] Figure 16 Polarization plot for simulated electrolyzer;

[0037] Figure 17 Potential vs. time at constant current plot for simulated electrolyzer in seawater at 100 mA / cm 2 Potential vs. time at constant current plot. DETAILED DESCRIPTION

[0038] The beneficial effects of the present application are verified by the following examples.

[0039] Example 1: The preparation method of trace noble metal modified NiMo catalyst in this example is carried out according to the following steps:

[0040] I. The foam nickel is cut into the size of 3 cm x 3 cm and 4 cm x 4 cm, and then sequentially placed in acetone and 6M hydrochloric acid for ultrasonic cleaning for 10 minutes. The acetone is used for degreasing treatment of the foam nickel, and the hydrochloric acid is used for washing off the oxidation layer on the surface of the foam nickel. Then, the residual acetone and hydrochloric acid are washed off with ethanol and deionized water. After cleaning, the clean foam nickel is obtained.

[0041] II. 1.2 mmol of Ni(NO3)2·6H2O and 0.3 mmol of (NH4)2MoO4·4H2O are dissolved in 30 mL of deionized water, and placed on a magnetic stirrer for stirring for 15 min to completely dissolve, to obtain a metal salt solution, and transferred to a hydrothermal synthesis reaction kettle. The clean foam nickel is immersed in the metal salt solution. After the reaction kettle is sealed, it is placed in a furnace at a temperature of 200°C for hydrothermal reaction for 6 h. After the reaction is completed, the foam nickel is taken out and cleaned to obtain foam nickel with micron-sized square columnar nickel molybdate crystals grown in situ on the surface.

[0042] III. An osmium chloride solution with a concentration of 0.337 mol / L is prepared by using osmium chloride, and 2.5 μL of the osmium chloride solution is uniformly dropped on the surface of the foam nickel obtained in step II. The precursor is obtained by vacuum drying in a vacuum drying oven at a temperature of 60°C for 6 h.

[0043] Four, the precursor was placed in a high temperature furnace, and high temperature annealing was carried out under a mixed gas atmosphere with a volume ratio of hydrogen to argon of 1:10, at a temperature of 500 DEG C for 2 h, to obtain a trace amount of noble metal osmium modified NiMo catalyst, denoted as Os-Ni4Mo / MoO2.

[0044] Comparative Example 1: This comparative example is to prepare Ni4Mo / MoO2, and the difference from Example 1 is that the operation of step three is omitted, and the other steps and parameters are the same as those of Example 1, to obtain Ni4Mo / MoO2.

[0045] Comparative Example 2: This comparative example is NiMoO4 / NF, and the difference from Example 1 is that the operations of steps three and four in Example 1 are not performed.

[0046] Comparative Example 3: This comparative example is a comparative Pt / C catalyst prepared by dropping the mixed slurry on the foam nickel, and the specific preparation method is as follows:

[0047] One, 60 μL of Nafion, 540 μL of deionized water and 400 μL of anhydrous ethanol were mixed, and then 20 mg of commercial Pt / C was added, and after mixing, ultrasonic treatment was performed for 30 min to obtain a mixed slurry;

[0048] Two, 200 μl of the mixed slurry was dropped on a clean foam nickel with a size of 1.5 cm x 1 cm, and then the foam nickel was placed in a vacuum drying oven and vacuum dried at a temperature of 80 DEG C for 8 h to obtain a Pt / C catalyst.

[0049] Comparative Example 4: This comparative example is a comparative ruthenium oxide (RuO2) catalyst prepared by dropping the mixed slurry on the foam nickel, and the specific preparation method is as follows:

[0050] One, 60 μL of Nafion, 540 μL of deionized water and 400 μL of anhydrous ethanol were mixed, and then 20 mg of RuO2 was added, and after mixing, ultrasonic treatment was performed for 30 min to obtain a mixed slurry;

[0051] Two, 200 μl of the mixed slurry was dropped on a clean foam nickel with a size of 1.5 cm x 1 cm, and then the foam nickel was placed in a vacuum drying oven and vacuum dried at a temperature of 80 DEG C for 8 h to obtain a RuO2 catalyst.

[0052] Figure 1 、 Figure 2 and Figure 3 are SEM photos of different scales of the Os-Ni4Mo / MoO2 prepared in Example 1, and from the figures it can be seen that the foam nickel substrate is distributed with micrometer-level square columnar catalysts, and from the high-magnification SEM photos it can be observed that small particles are attached to the surface of the microcrystalline square column.

[0053] Figure 4 High resolution TEM picture of Os-Ni4Mo / MoO2 prepared for Example 1, from Figure 4 It can be seen that the surface of the square columnar crystal is distributed with osmium metal particles, and these nanoscale osmium particles are embedded on molybdenum dioxide (MoO2) and nickel molybdenum alloy (Ni4Mo).

[0054] Figure 5 Os-Ni4Mo / MoO2 prepared for Example 1 and Ni4Mo / MoO2 prepared for Comparative Example 1 2、 The X-ray diffraction spectrum of NiMoO4 prepared for Comparative Example 2, compared with the known phase spectrum, determines the phase composition of the material, and Os-Ni4Mo / MoO2 prepared for Example 1 is Ni4Mo alloy and MoO2.

[0055] The trace noble metal osmium modified NiMo catalyst Os-Ni4Mo / MoO2 prepared for Example 1, Ni4Mo / MoO2 prepared for Comparative Example 1, foamed nickel prepared for Comparative Example 2, and Pt / C catalyst prepared for Comparative Example 3 were respectively used as hydrogen evolution catalysts for linear sweep voltammetry (LSV) test, and the specific test method was as follows: a three-electrode test system composed of a working electrode, a counter electrode and a reference electrode was connected to an electrochemical workstation, and scanning was carried out at a scanning rate of 5 mV / s between -0.8 V and -3 V, and the hydrogen evolution polarization curves of each catalyst in pure water were as shown in Figure 6 The hydrogen evolution polarization curves in seawater were as shown in Figure 8 It can be seen from the comparison that, whether in alkaline pure water or in alkaline seawater, the performance of Os-Ni4Mo / MoO2 prepared for Example 1 is better than that of the catalysts of the comparative examples, and it shows excellent performance of 9.23 mV@10 mA / cm 2 and 11.6 mV@10 mA / cm 2 in pure water and seawater respectively. It is emphasized that the trace noble metal osmium modified NiMo catalyst Os-Ni4Mo / MoO2 prepared for Example 1 shows intrinsic activity comparable to commercial Pt / C, and the performance is far superior to commercial Pt / C at large current density. The alkaline pure water used for the test is prepared by adding 1 mol of KOH into a 1 L volumetric flask and then diluting with deionized water, and the alkaline seawater is prepared by adding 1 mol of KOH into a 1 L volumetric flask and then diluting with seawater.

[0056] Figure 7 The potential-time curve of the trace noble metal osmium modified NiMo catalyst Os-Ni4Mo / MoO2 prepared for Example 1 as a hydrogen evolution catalyst in pure water at a constant current of 500 mA / cm 2 The potential-time curve of the trace noble metal osmium modified NiMo catalyst Os-Ni4Mo / MoO2 prepared for Example 1 as a hydrogen evolution catalyst in pure water at a constant current of 500 mA / cm Figure 7It can be seen that the trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 prepared in Example 1 exhibits good performance in pure water at 500 mA / cm². 2 Under stable operating conditions for 100 hours, performance shows almost no degradation. Figure 9 The trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 prepared in Example 1 was used as a hydrogen evolution catalyst in alkaline seawater at 100 mA / cm². 2 200mA / cm 2 300mA / cm 2 400mA / cm 2 500mA / cm 2 The graph showing the change of electric potential over time under the given conditions, from Figure 9 It can be seen that after more than 1000 hours (42 days) of stable operation, the performance has hardly degraded significantly, indicating that the trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 prepared in Example 1 has excellent stability as a hydrogen evolution catalyst.

[0057] The trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 prepared in Example 1, the Ni4Mo / MoO2 prepared in Comparative Example 1, the nickel foam prepared in Comparative Example 2, and the RuO2 catalyst prepared in Comparative Example 4 were used as oxygen evolution catalysts for linear sweep voltammetry (LSV) testing. The specific testing method is as follows: a three-electrode testing system consisting of a working electrode, a counter electrode, and a reference electrode was connected to an electrochemical workstation, and a scan was performed between 0 and 2 V at a scan rate of 5 mV / s. The oxygen evolution polarization curves of each catalyst in pure water are shown below. Figure 10 As shown, the oxygen evolution polarization curve in seawater is as follows: Figure 12 As shown in the comparison, it can be seen that, regardless of alkaline pure water or alkaline seawater conditions, the performance of the trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 prepared in Example 1 is superior to that of the comparative example, exhibiting a performance of 244.4 mV@10 mA / cm² in pure water. 2 243.8mV@10mA / cm in seawater 2 The Os-Ni4Mo / MoO2 exhibits superior intrinsic activity compared to commercially available ruthenium oxide catalysts, and its performance at high current densities is far superior to that of commercial RuO2.

[0058] The trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 prepared in Example 1 was tested in pure water at 100 mA / cm². 2 The curve of the change of electric potential over time under the operating conditions is shown in the figure. Figure 11 As shown, from Figure 11 It can only be seen that in pure water 100mA / cm2 Under stable operating conditions for 50 hours, performance showed almost no degradation.

[0059] The trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 prepared in Example 1 was tested in seawater at 500 mA / cm². 2 The curve of potential change over time under constant current is shown in the figure. Figure 13 As shown, from Figure 13 It can be seen that in alkaline seawater at 500 mA / cm 2 Under certain conditions, after more than 1000 hours of stable operation, the performance will decrease by approximately 30mV.

[0060] The trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 prepared in Example 1 was used as both the oxygen evolution side and hydrogen evolution side catalysts, and linear sweep voltammetry (LSV) was performed. Simultaneously, LSV was performed using Comparative Example 3 as the hydrogen evolution side catalyst and the RuO2 catalyst prepared in Comparative Example 4 as the oxygen evolution side catalyst. The obtained polarization curves are shown below. Figure 14 As shown, from Figure 14 It can be seen that, in alkaline seawater, the trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 prepared in Example 1 is no less effective than the comparative example.

[0061] Figure 15 The trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 prepared in Example 1 was used as both the oxygen evolution side and hydrogen evolution side catalyst in seawater at 500 mA / cm². 2 After operating stably under constant current for more than 1000 hours, the performance degradation is 112mV.

[0062] To verify the practicality of the trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 in Example 1, a 4cm × 4cm trace noble metal osmium-modified NiMo catalyst Os-Ni4Mo / MoO2 was simultaneously used as both the oxygen evolution side and hydrogen evolution side catalyst in a simulated electrolyzer, resulting in a simulated electrolyzer. The polarization curves in the simulated electrolyzer are shown in the figure below. Figure 16 As shown, from Figure 16 It can be seen that when the large-area prepared Example 1 is assembled in an electrolytic cell and compared with the foamed nickel assembled in the electrolytic cell, the simulated electrolytic cell assembled with Example 1 has better electrocatalytic performance.

[0063] Figure 17 To simulate an electrolytic cell at 100 mA / cm 2 The graph shows the change in potential over time during the electrolysis of seawater to produce hydrogen under constant current. Figure 17 It can be seen that the simulated electrolytic cell equipped with Example 1 can achieve an output of 100 mA / cm². 2The performance decay is about 80 mV after 200 hours of stable operation at a current density.

[0064] From Figure 16 and Figure 17 It can be seen that the trace noble metal osmium modified NiMo catalyst Os-Ni4Mo / MoO2 has excellent performance.

[0065] Among noble metals, osmium (Os) as a member of platinum group metals is less concerned in the field of electrocatalysis, and the price of osmium (400 dollars per ounce) is much lower than that of platinum (1094 dollars per ounce), and much lower than that of iridium, making it the most potential substitute for noble metals Pt and RuO2. The trace noble metal osmium modified NiMo catalyst Os-Ni4Mo / MoO2 of the present application is a molybdenum-nickel-based electrocatalyst, and its electrocatalytic performance is further improved by doping a small amount of noble metal osmium (Os), which not only can reduce the use of noble metals, but also can maintain its high activity. The catalyst also has the characteristics of high efficiency and long service life, and can be used as a catalyst for cathode and anode at the same time, which is used in the field of hydrogen production by water electrolysis, and can solve the problems of high cost, complex process and seawater electrolysis for hydrogen production in the field of hydrogen production by water electrolysis.

Claims

1. A method for preparing a trace noble metal-modified NiMo catalyst, characterized in that, This method is performed in the following steps:

1. Cut the nickel foam into 3cm × 3cm and 4cm × 4cm sizes, and then place them in acetone and 6M hydrochloric acid in sequence for ultrasonic cleaning for 10 minutes. The purpose of acetone is to degrease the nickel foam, and the purpose of hydrochloric acid is to wash away the oxide layer on the surface of the nickel foam. Then wash away the residual acetone and hydrochloric acid with ethanol and deionized water. After cleaning, take it out to obtain clean nickel foam.

2. Dissolve 1.2 mmol of Ni(NO3)2·6H2O and 0.3 mmol of (NH4)2MoO4·4H2O in 30 mL of deionized water, and stir on a magnetic stirrer for 15 min to completely dissolve them to obtain a metal salt solution. Transfer the solution to a hydrothermal synthesis reactor, immerse the clean nickel foam in the metal salt solution, seal the reactor and place it in a furnace at 200 ℃ for hydrothermal reaction for 6 h. After the reaction is completed, remove the nickel foam and clean it to obtain nickel foam with micron-sized prismatic nickel molybdate crystals grown in situ on the surface.

3. Prepare an osmium chloride solution with a concentration of 0.337 mol / L using osmium chloride, and uniformly add 2.5 μL of the osmium chloride solution to the surface of the nickel foam obtained in step 2. Place it in a vacuum drying oven and vacuum dry it at a temperature of 60 ℃ for 6 h to obtain the precursor. IV. The precursor was placed in a high-temperature furnace and annealed at 500°C for 2 hours under a mixed atmosphere of hydrogen and argon at a volume ratio of 1:10, to obtain a trace amount of osmium-modified NiMo catalyst, denoted as Os-Ni4Mo / MoO. 2。 2. The application of the trace noble metal modified NiMo catalyst prepared according to claim 1, characterized in that... This application involves using a trace amount of precious metal-modified NiMo catalyst in the electrolysis of seawater to produce hydrogen.

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