Oxygen evolution catalyst, method for preparing same, and use thereof

Abstract

The application provides an oxygen evolution catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: 1) reacting an iridium source and a ruthenium source with a template agent in a reaction medium to obtain a precursor; 2) heat-treating the precursor in a CO atmosphere; and 3) removing the template agent to obtain an IrRux@Ir alloy material, namely the oxygen evolution catalyst. x @The charge transfer between Ru in the inside and Ir on the surface of the Ir@Ru oxygen evolution catalyst plays a role of electronic structure regulation, and therefore the oxygen evolution catalyst has better oxygen evolution activity. The protection of the surface Ir on the IrRux in the inside makes the IrRux not easy to be dissolved and oxidized under an acidic condition, and when the IrRux is used as a water electrolysis anode catalyst to assemble an electrolytic water device, the IrRux has a lower cell voltage; and under a large current density of 1 A cm ‑2 >-2, the IrRux can be stably used for nearly 400 h, and has commercial practical value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production by water electrolysis, in particular to an oxygen evolution catalyst, a preparation method and application thereof. BACKGROUND

[0002] The hydrogen production by water electrolysis technology is mainly divided into two parts of anode oxygen evolution reaction (OER) and cathode hydrogen evolution reaction (HER). Among them, the proton exchange membrane (PEM) water electrolysis cell electrolysis water technology has high current density, high voltage efficiency, good load range, excellent system response and high-purity gas, which is considered as the most promising water electrolysis hydrogen production technology. However, due to the slow kinetics of OER and harsh acid conditions and high anode potential, it is imperative to study the catalyst with high activity and stability under acid conditions.

[0003] However, the main commercial catalysts on the market at present are iridium (Ir) or ruthenium (Ru) based catalysts. The Ir-based catalyst has good stability under acid conditions, but the activity is poor. The Ru-based catalyst has a lower oxygen evolution overpotential, but it is not stable under acid conditions and is easily oxidized to RuO4 dissolved in the solution under high potential, resulting in poor stability. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide an oxygen evolution catalyst, a preparation method and application thereof, which solves the problem that the oxygen evolution catalyst in the prior art cannot have high activity and stability under acid conditions.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application is obtained by including the following technical solutions.

[0006] The present application provides a preparation method of an oxygen evolution catalyst, comprising the following steps:

[0007] 1) reacting iridium source and ruthenium source with a template agent in a reaction medium to obtain a precursor;

[0008] 2) heat treating the precursor in a CO atmosphere;

[0009] 3) removing the template agent to obtain IrRu x @Ir alloy material, i.e. oxygen evolution catalyst.

[0010] Preferably, in step 1), the molar ratio of iridium ions to ruthenium ions in the iridium source and the ruthenium source is (1-5):1.

[0011] Preferably, in step 1), the reaction temperature is 70-95℃.

[0012] Preferably, in step 1), the reaction time is 2-4 h.

[0013] Preferably, in step 3), the heat treatment temperature is 300-400℃.

[0014] Preferably, in step 3), the heat treatment time is 0.5-3 h.

[0015] Preferably, the iridium source is selected from one or more of chloro iridic acid, iridium acetate and iridium tetrachloride.

[0016] Preferably, the ruthenium source is selected from one or more of ruthenium chloride, ruthenium acetylacetone and potassium hexachlororuthenate.

[0017] Preferably, the template agent is magnesium oxide or silicon dioxide.

[0018] Preferably, the reaction medium is water.

[0019] Preferably, in step 1), the molar ratio of iridium ions in the iridium source to the template agent is 1: (15-25).

[0020] Preferably, in step 1), the pH of the reaction system is 9.0-10.0.

[0021] Preferably, when the template agent is magnesium oxide, in step 3), the template agent is removed by acid treatment; when the template agent is silicon dioxide, in step 3), the template agent is removed by alkali treatment.

[0022] Preferably, the acid treatment is soaking in a nitric acid aqueous solution with a concentration of 0.5-4 mol / L for 1-4 h.

[0023] Preferably, the acid treatment is soaking in a sodium hydroxide aqueous solution with a concentration of 0.5-1.5 mol / L for 1-2 h.

[0024] Preferably, in step 3), the heating rate during the heat treatment is 2-10℃ / min.

[0025] Preferably, in step 3), the flow rate of CO gas is 50-200 mL / min.

[0026] As described above, the oxygen evolution catalyst of the present application and the preparation method and application thereof have the following beneficial effects: the different CO adsorption strengths of Ir and Ru are utilized to synthesize the core-shell structure IrRu x @Ir oxygen evolution catalyst, the charge transfer between the internal Ru and the surface Ir plays a role in electronic structure regulation, and therefore has better oxygen evolution activity. The surface Ir controls the internal IrRu xThe protection makes it not easy to dissolve and oxidize under acidic conditions, and has a lower cell voltage when assembling an electrolytic water device as an anode catalyst of water electrolysis. It can be stable for nearly 400 h under a large current density of 1 A cm -2 , and has commercial practical value. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 XRD patterns of the catalysts prepared in Example 1 and Comparative Example 1 are shown.

[0028] Figure 2 Low-magnification TEM images of the catalysts prepared in Example 1 (A) and Comparative Example 1 (B) are shown.

[0029] Figure 3 High-magnification TEM images and element linear scanning images of the catalysts prepared in Example 1 (A, B) and Comparative Example 1 (C, D) are shown.

[0030] Figure 4 High-angle annular dark field scanning transmission electron microscopy images (a), element distribution images (b-d), and element linear scanning images (e) of the catalyst prepared in Example 1 are shown.

[0031] Figure 5 X-ray photoelectron spectroscopy curves corresponding to Ir 4f (A) and Ru 3d (B) high-resolution X-ray photoelectron spectroscopy curves of the catalysts prepared in Example 1 and Comparative Example 1, and XPS etching spectroscopy curves (C, D) of the catalyst prepared in Example 1 are shown.

[0032] Figure 6 Test results of the catalyst prepared in Example 1, the catalyst prepared in Comparative Example 1, commercial IrO2, RuO2, and Ir in catalytic oxygen evolution reaction (test conditions: rotating disc electrode, 0.5 M H2SO4 solution saturated with N2, scan rate of 5 mV s -1 , rotation speed of 1600 rpm) are shown: A is a polarization curve comparison chart; B is a Tafel slope chart corresponding to A; C is a mass activity (MA) and specific activity (SA) chart corresponding to A; D is a double-layer capacitance chart of the above five catalysts; and E is a polarization curve obtained using the electrochemical active area.

[0033] Figure 7 Polarization curves of the catalyst prepared in Example 1 and the catalyst prepared in Comparative Example 1, IrRu x , respectively, as an anode catalyst to assemble a proton exchange membrane water electrolysis device (test conditions: cathode catalyst is a commercial 60 wt% Pt / C catalyst, loading of 0.5 mg cm -2 , anode catalyst loading of 1.5 mg Pt cm -2Nafion 115 proton exchange membrane).

[0034] Figure 8 The catalyst prepared in Example 1 and IrRu prepared in Comparative Example 1 x The polarization curves of the catalyst prepared in Example 1 and IrRu prepared in Comparative Example 1 -2 before and after the stability test of the catalyst for the oxygen evolution reaction in 0.5 M H2SO4 solution saturated with N2 (test conditions: carbon paper as the working electrode, catalyst loading 70 ug cm -2 , setting time 24 h).

[0035] Figure 9 The catalyst prepared in Example 1 and IrRu prepared in Comparative Example 1 x were respectively used as the anode catalyst to assemble a proton exchange membrane water electrolysis device, and a constant current stability test was performed at a current density of 1 A cm -2 .

[0036] Figure 10 The XPS graphs of Ir 4f and Ru 3d corresponding to the catalyst prepared in Example 1 and IrRu prepared in Comparative Example 1 x after the stability test.

[0037] Figure 11 The X-ray powder diffraction curves of the catalyst prepared in Example 1 and IrRu prepared in Comparative Example 1 x respectively used as the anode catalyst to assemble a proton exchange membrane water electrolysis device after the completion of the constant current test.

[0038] Figure 12 The cyclic voltammetry test curves for calculating the double-layer capacitance of the catalyst prepared in Example 1 (A, B) and IrRu prepared in Comparative Example 1 (C, D) x respectively (test conditions: rotating disc electrode, 0.5 M H2SO4 solution saturated with N2, the sweep rates of the curves from inside to outside were 2, 4, 6, 8, 10 mV s -1 , rotation speed 1600 rpm). DETAILED DESCRIPTION

[0039] The present application is herein described, by way of example only, with reference to certain embodiments thereof. It is construed that persons skilled in the art can easily appreciate other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied in other different embodiments, and each detail in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0040] It should be understood that the process equipment or device not specifically mentioned in the following examples is the conventional equipment or device in the art.

[0041] In addition, it should be understood that the one or more method steps mentioned in the present application do not exclude that there can be other method steps before and after the combination steps or other method steps can be inserted between the explicitly mentioned steps, unless otherwise specified; it should also be understood that the combination connection relationship between the one or more devices / apparatuses mentioned in the present application does not exclude that there can be other devices / apparatuses before and after the combination devices / apparatuses or other devices / apparatuses can be inserted between the two explicitly mentioned devices / apparatuses, unless otherwise specified. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not a limitation on the arrangement order of each method step or a limitation on the scope of the present application that can be implemented, and the change or adjustment of the relative relationship is also considered as the scope of the present application that can be implemented without substantial change of the technical content.

[0042] A specific preparation method of an oxygen evolution catalyst is provided in the embodiments of the present application, which comprises the following steps:

[0043] 1) reacting an iridium source and a ruthenium source with a template agent in a reaction medium to obtain a precursor;

[0044] 2) heat-treating the precursor in a CO atmosphere;

[0045] 3) removing the template agent to obtain an IrRu x @Ir alloy material, i.e. an oxygen evolution catalyst.

[0046] In the above technical solution of the present application, the sol-gel method and the sacrificial template method are used, which is simple, controllable, and suitable for macro-scale preparation, has few synthesis steps and short synthesis time, and is suitable for scale application. The present application uses the different CO adsorption strengths of Ir and Ru elements to construct an oxygen evolution catalyst with a core-shell structure. The surface Ir plays a protective role in the acidic environment of the internal IrRu, the internal Ru and the surface Ir have charge transfer, and play a role in electronic structure regulation, so the oxygen evolution catalyst has good activity and stability in an acidic electrolyte.

[0047] In a more specific embodiment, in step 1), after the reaction, a drying process is further included, the drying temperature is 60-80°C, and the drying time is 1.5-24 h.

[0048] In a more specific embodiment, in step 3), after removing the template agent, a filtering, washing, and drying process is further included. The drying is freeze-drying, and the drying time is 4-24 h.

[0049] In one specific embodiment, in step 1), the molar ratio of iridium ions to ruthenium ions in the iridium source and the ruthenium source is (1-5):1, such as specifically 7:3, 1:1, 2:1, 3:1, 4:1, 5:1.

[0050] In one specific embodiment, in step 1), the reaction temperature is 70-95℃, such as specifically 70℃, 75℃, 80℃, 85℃, 90℃, 95℃.

[0051] In one specific embodiment, in step 1), the reaction time is 2-4h, such as specifically 2h, 3h, 4h.

[0052] In one specific embodiment, in step 3), the heat treatment temperature is 300-400℃, such as specifically 300℃, 350℃, 400℃.

[0053] In one specific embodiment, in step 3), the heat treatment time is 0.5-3h, such as specifically 0.5h, 1h, 2h, 3h.

[0054] In one specific embodiment, the iridium source is selected from one or more of chloroiridic acid, iridium acetate, and iridium tetrachloride.

[0055] In one specific embodiment, the ruthenium source is selected from one or more of ruthenium chloride, ruthenium acetylacetonate, and potassium hexachlororuthenate.

[0056] In one specific embodiment, the template agent is magnesium oxide or silicon dioxide.

[0057] In one more specific embodiment, the iridium source is chloroiridic acid, the ruthenium source is ruthenium chloride, and the template agent is magnesium oxide.

[0058] In one specific embodiment, the reaction medium is water.

[0059] In one specific embodiment, in step 1), the molar ratio of iridium ions to template agent in the iridium source is 1:(15-25), such as specifically 1:(15-20), 1:(20-25).

[0060] In one specific embodiment, in step 1), the pH of the reaction system is 9.0-10.0.

[0061] In one specific embodiment, the template agent is magnesium oxide, and in step 3), the template agent is removed by acid treatment. In one more specific embodiment, the acid treatment is soaking with a nitric acid aqueous solution having a concentration of 0.5-4 mol / L for 1-4h.

[0062] In one specific embodiment, the template agent is silica, and the template agent is removed by an alkali treatment in step 3). In a more specific embodiment, the alkali treatment is soaking in a 0.5-1.5 mol / L aqueous sodium hydroxide solution for 1-2 h.

[0063] In one specific embodiment, the heating rate during the heat treatment in step 3) is 2-10°C / min, such as specifically 2-4°C / min, 4-6°C / min, 6-8°C / min, or 8-10°C / min.

[0064] In one specific embodiment, the flow rate of CO gas in step 3) is 50-200 mL / min, such as specifically 50-100 mL / min, 100-150 mL / min, or 150-200 mL / min.

[0065] The following specific examples illustrate the embodiments of the present application, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present specification.

[0066] Example 1

[0067] This example provides a specific method for preparing an oxygen evolution catalyst, comprising the following steps:

[0068] (1) Dissolve 549 mg of chloroiridic acid and 123.6 mg of ruthenium chloride in deionized water, and add a 0.5M NaOH solution to adjust the pH to 9.0;

[0069] (2) Add 0.8 g of magnesium oxide to the above solution, and stir in a water bath at 90°C for 3 hours to obtain a precursor. Centrifuge and wash multiple times, and dry for standby use;

[0070] (3) Heat treat the above precursor at 350°C for 2 h under CO reduction gas to obtain a reduced alloy sample;

[0071] (4) Wash the reduced sample with 1M HNO3, then filter, wash with deionized water, and dry to obtain the core-shell structured IrRu x @ alloy material, which is an oxygen evolution catalyst.

[0072] The catalyst obtained in this example was tested for oxygen evolution polarization curves in a 0.5 M H2SO4 solution, and the 10 mA cm -2 The corresponding overpotential was 288 mV.

[0073] Example 2

[0074] Example 2 differs from Example 1 in that the heat treatment temperature of step 3) is 250°C, and the rest of the process is exactly the same. The obtained catalyst is tested for oxygen evolution polarization curve in 0.5 M H2SO4 solution, and the 10 mA cm-2 current density is obtained at 1.63 V. -2 The corresponding overpotential is 344 mV.

[0075] Example 3

[0076] Example 3 differs from Example 1 in that the heat treatment temperature of step 3) is 300°C, and the rest of the process is exactly the same.

[0077] The obtained catalyst is tested for oxygen evolution polarization curve in 0.5 M H2SO4 solution, and the 10 mA cm-2 current density is obtained at 1.65 V. -2 The corresponding overpotential is 295 mV.

[0078] Example 4

[0079] Example 4 differs from Example 1 in that the heat treatment temperature of step 3) is 400°C, and the rest of the process is exactly the same.

[0080] The obtained catalyst is tested for oxygen evolution polarization curve in 0.5 M H2SO4 solution, and the 10 mA cm-2 current density is obtained at 1.65 V. -2 The corresponding overpotential is 300 mV.

[0081] By comparing the data of Examples 1-4, it can be seen that the catalyst obtained by using a heat treatment temperature of 350°C has the highest activity.

[0082] Example 5

[0083] This example provides a specific preparation method of an oxygen evolution catalyst, comprising the following steps:

[0084] (1) 1060 mg of iridium acetate and 184.5 mg of potassium hexachlororuthenate are dissolved in deionized water, and 0.5 M NaOH solution is added to adjust the pH to 9.0;

[0085] (2) 1.2 g of silicon dioxide is added to the above solution, and stirred in a water bath at 90°C for 3 hours to obtain a precursor, which is washed by centrifugation for multiple times and dried for standby;

[0086] (3) The above precursor is heat treated at 350°C for 2 h under CO reduction gas to obtain a reduced alloy sample;

[0087] (4) The reduced sample is washed with 1 M NaOH aqueous solution, then filtered, washed with deionized water, and dried to obtain the core-shell structured IrRu x @Ir alloy material, which is an oxygen evolution catalyst.

[0088] The catalyst obtained in this example was tested in 0.5 M H2SO4 solution, and the oxygen evolution polarization curve was measured to be 10 mAcm. -2 The corresponding overpotential is 295 mV.

[0089] Comparative Example 1

[0090] The difference between Comparative Example 1 and Example 1 is that in step 3), the heat treatment atmosphere is a mixture of H2 and Ar (H2 to Ar volume ratio of 1:9), while the rest of the process is exactly the same. The resulting material is denoted as IrRu. x .

[0091] The X-ray powder diffraction patterns of the catalysts prepared in Example 1 and Comparative Example 1 are as follows: Figure 1 As shown, by Figure 1 It can be seen that the catalyst prepared in Example 1 corresponds to Ir 0.6 Ru 0.4 The face-centered cubic structure of the catalyst prepared in Comparative Example 1 corresponds to Ir. 0.44 Ru 0.56 The close-packed hexagonal structure of IrRu proves that the heat treatment atmosphere is the key factor in the formation of the core-shell structure. x The key to Ir alloy materials.

[0092] Figure 2 The images shown are low-magnification TEM images of the catalysts prepared in Example 1 and Comparative Example 1, from... Figure 2 As can be seen from A, the catalyst prepared in Example 1 has a size of approximately 4-5 nm and is uniformly dispersed; from Figure 2 As can be seen from B, the catalyst of Comparative Example 1 has a particle size of about 5~6 nm and obvious agglomeration.

[0093] Figure 3 The images shown are high-magnification TEM images and elemental linear scans of the catalysts prepared in Example 1 and Comparative Example 1. Combined with... Figure 3 A and Figure 3 B shows that the IrRu prepared in Example 1 x @Ir has a core-shell structure with a high surface Ir content; combined with Figure 3 C and Figure 3 As can be seen from D, the IrRu prepared in Comparative Example 1 x It has a homogeneous alloy structure.

[0094] Figure 4 The images shown are high-angle annular dark-field scanning transmission electron microscope (spherical aberration electron microscope) spectra, elemental distribution maps, and elemental linear scan maps of the catalyst prepared in Example 1. Figure 4 The top right corner shows the Fourier transform graph, further proving that the catalyst is Ir. 0.6 Ru 0.4of

[200] and

[111] facets, by Figure 4 b-d can clearly see the uniform distribution of Ir and Ru elements and the final surface of the core-shell structure of the iridium element-rich. Combined with Figure 4 e further proves that the IrRu x @material prepared in Example 1 has a core-shell structure.

[0095] Figure 5 The X-ray photoelectron spectroscopy curve corresponding to the Ir 4f (A) and Ru 3d (B) high-resolution X-ray photoelectron spectroscopy curve of the catalyst prepared in Example 1 and Comparative Example 1, and the XPS etching spectroscopy curve of the catalyst prepared in Example 1 (C, D) is shown. Figure 5 A shows the valence state of Ir in the catalyst IrRu x @prepared in Example 1 is higher than that of IrRu x @prepared in Comparative Example 1. Figure 5 B shows the valence state of Ru in the catalyst IrRu x @prepared in Example 1 is lower than that of IrRu x @prepared in Comparative Example 1, indicating that charge transfer occurs between Ir and Ru in the prepared catalyst. Figure 5 C and Figure 5 D are the XPS graphs of the IrRu x @Ir catalyst prepared in Example 1 after etching, which further proves the charge transfer between the surface Ir and the internal Ru.

[0096] Figure 6 The X-ray photoelectron spectroscopy curve corresponding to the Ir 4f (A) and Ru 3d (B) high-resolution X-ray photoelectron spectroscopy curve of the catalyst prepared in Example 1 and Comparative Example 1, and the XPS etching spectroscopy curve of the catalyst prepared in Example 1 (C, D) is shown. x @Ir and IrRu x @prepared in Comparative Example 1, commercial IrO2, RuO2, Ir catalysts were tested under the following conditions: rotating disc electrode, 0.5 M H2SO4 solution saturated with N2, and the oxygen evolution reaction test results are shown in the figure. -1 @under the test conditions: rotating disc electrode, 0.5 M H2SO4 solution saturated with N2, and the oxygen evolution reaction test results are shown in the figure. Figure 6 A can see that the overpotential of the catalyst prepared in Example 1 is 288 mV at 10 mA cm -2 @in the oxygen evolution reaction, showing very good oxygen evolution electrocatalytic activity; Figure 6 B is Figure 6 A corresponds to the Tafel slope, and IrRu x @Ir has the smallest Tafel slope; Figure 6 C is the corresponding mass activity (MA) and specific activity (SA), and IrRu x @Ir has the highest MA and SA; Figure 6 The slope of the curve in D is the corresponding double-layer capacitance; Figure 6E is the polarization curve calculated based on the electrochemical active area.

[0097] Figure 7 The catalyst prepared in Example 1 and the catalyst IrRu prepared in Comparative Example 1 are shown. x Polarization curves of proton exchange membrane water electrolysis devices assembled using these devices as anode catalysts. Figure 7 It can be seen that IrRu x @Ir has the lowest cell voltage at the same current density.

[0098] Figure 8 The catalyst prepared in Example 1 and the IrRu prepared in Comparative Example 1 are shown. x A comparison of polarization curves before and after stability testing of the oxygen evolution reaction catalyzed by IrO2 and Ir in N2-saturated 0.5M H2SO4 solution. Figure 8 It can be seen that the catalyst prepared in Example 1 can remain stable for 24 hours without any increase in potential, while the other three catalysts show significant degradation, indicating that the catalyst synthesized in this example has good stability.

[0099] Figure 9 The catalyst prepared in Example 1 and the IrRu prepared in Comparative Example 1 are shown. x Proton exchange membrane water electrolysis devices were assembled using these devices as anode catalysts, and the results were obtained at 1 A cm⁻¹. -2 A constant current stability test was performed at a current density. Figure 9 It can be seen that at 1 A cm -2 The catalyst IrRu prepared in Example 1 under high current density x @Ir was able to run stably for nearly 400 h, while the IrRu prepared in Comparative Example 1... x The tank pressure will increase rapidly within 130 hours.

[0100] Figure 10 The catalyst prepared in Example 1 and the IrRu prepared in Comparative Example 1 are shown. x XPS graphs of Ir4f and Ru 3d after stability testing, from Figure 10 It can be seen that, compared to before the test, IrRu x The electronic structures of Ir and Ru in @Ir remain stable, while IrRu x Significant changes have occurred, indicating the instability of the latter.

[0101] Figure 11 The catalyst prepared in Example 1 and the IrRu prepared in Comparative Example 1 are shown. x X-ray powder diffraction patterns of proton exchange membrane water electrolysis devices assembled using each as an anode catalyst after constant current testing. Figure 11It can be found that the XRD curve of IrRu x @Ir changes little and the catalyst still has face-centered cubic structure. The XRD curve of IrRu x @Ir changes obviously and the catalyst changes from hexagonal close-packed structure to face-centered cubic structure, which proves that IrRu x @Ir has excellent stability after the assembly of the device (the catalyst structure is obtained by comparing the pdf card on jade).

[0102] Figure 12 The catalyst IrRu x @Ir prepared in Example 1 and the catalyst IrRu x @Ir prepared in Comparative Example 1. Figure 12 It can be seen that the double-layer capacitance of IrRu x @Ir is small but the electrochemical activity is higher, which indicates that it has better intrinsic activity.

[0103] In summary, the core-shell structure IrRu x @Ir with rich iridium on the surface is synthesized by using the different CO adsorption strengths of Ir and Ru, which is an oxygen evolution catalyst. The charge transfer between Ru in the interior and Ir on the surface plays a role in the electronic structure regulation, so it has better oxygen evolution activity. The protection of the surface Ir to the internal IrRux makes it not easy to dissolve and oxidize under acidic conditions, and when it is used as a water electrolysis anode catalyst to assemble an electrolytic water device, it has a lower cell voltage. It can be stable for nearly 400 h under a large current density of 1 A cm -2 , which has commercial practical value. Therefore, the present application effectively overcomes the various shortcomings in the prior art and has high industrial utilization value.

[0104] The above examples only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above examples without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A method for producing an oxygen evolution catalyst, characterized by, The preparation method of the catalyst comprises the following steps: 1) reacting an iridium source and a ruthenium source with a template agent in a reaction medium to obtain a precursor; 2) heat treating the precursor in a CO atmosphere; 3) removing the template agent to obtain IrRu with core-shell structure x @Ir alloy material, i.e. oxygen evolution catalyst; In step 1), the substance amount ratio of iridium ions to ruthenium ions in the iridium source and the ruthenium source is (1-5):1; In step 3), the heat treatment temperature is 300-400℃; In step 3), the heat treatment time is 0.5-3 h.

2. The method of claim 1, wherein: The reaction temperature is 70-95℃; And / or, the reaction time is 2-4 h.

3. The method of claim 1, wherein: The iridium source is selected from one or more of chloroiridic acid, iridium acetate and iridium tetrachloride; And / or, the ruthenium source is selected from one or more of ruthenium chloride, ruthenium acetylacetonate and potassium hexachlororuthenate; And / or, the template agent is magnesium oxide or silicon dioxide; And / or, the reaction medium is water.

4. The method of claim 1, wherein: The substance amount ratio of iridium ions to the template agent in the iridium source is 1:(15-25); and / or, the pH of the reaction system is 9.0-10.

0.

5. The method of claim 3, wherein: When the template agent is magnesium oxide, in step 3), the template agent is removed by acid treatment; when the template agent is silicon dioxide, in step 3), the template agent is removed by alkali treatment.

6. The method of claim 5, wherein: The acid treatment is soaking in a nitric acid aqueous solution with a concentration of 0.5-4 mol / L for 1-4 h.

7. The method of claim 5, wherein: The alkali treatment is soaking in a sodium hydroxide aqueous solution with a concentration of 0.5-1.5 mol / L for 1-2 h.

8. The method of claim 1, wherein: In step 3), the heating rate in the heat treatment process is 2-10℃ / min; And / or, the flow rate of the CO gas is 50-200 mL / min.

9. An oxygen evolution catalyst prepared by the preparation method of any one of claims 1-8.

10. Use of the oxygen evolution catalyst of claim 9 as an anode catalyst in a proton exchange membrane water electrolysis device.

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