Preparation method and application of high-activity supported PtIr alloy OER catalyst

Abstract

The invention relates to the technical field of electrochemical catalysts, and discloses a preparation method and application of a high-activity supported PtIr alloy OER catalyst, and the preparation method comprises the following steps: S1, preparation of a carrier: ultrasonically dispersing titanium oxide in a mixed solution of water and a reducing agent, adding a platinum precursor, uniformly mixing, and carrying out reflux treatment to obtain a black carrier; s2, load annealing: uniformly mixing the black carrier obtained in S1 with an iridium precursor in a reducing agent, and annealing in air to obtain black powder; and S3, washing and drying: carrying out centrifugal washing on the black powder obtained in S2, and finally drying to obtain the PtIrTi compound catalyst. According to the PtIr-based electrode catalyst with high activity, the catalyst is widely applied to electrochemical reaction and shows excellent performance in the water electrolysis catalytic oxidation process, the activity of the catalyst is higher than that of a single platinum or iridium catalyst, and the preparation method is simple in operation steps and production equipment, high in safety and reliability and low in preparation cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical catalysts, and in particular to a preparation method and application of a highly active supported PtIr alloy OER catalyst. Background Art

[0002] With the rapid development of renewable energy and clean energy technologies, the research on electrochemical catalysts has become particularly important, especially electrode catalysts used in hydrogen production and fuel cells, which play a core role.

[0003] Platinum-iridium-based compound catalysts have become the focus of research due to their excellent catalytic performance, good conductivity and strong stability. Iridium (Ir), which has become the focus of research, is an electrocatalyst in traditional acidic electrolytes and is widely used as anode catalyst material for water electrolysis. However, the scarcity and high cost of iridium limit its large-scale application. In order to overcome this problem, researchers began to explore platinum (Pt) as an alternative material. Platinum is also a rare precious metal. It costs less than iridium and has good chemical stability and corrosion resistance. It exhibits similar catalytic activity to iridium in certain electrochemical reactions. The combination of platinum-iridium-based compound catalysts takes advantage of the advantages of both and can reduce the amount of iridium while ensuring high catalytic activity. At the same time, some studies have successfully improved TiO 2 Supported iridium oxides for long-term OER performance.

[0004] In the prior art, for example, the application number is CN201910490325.5 and the name disclosed is: a method for preparing an iridium catalyst, which includes the following steps: S1, in an oxygen-free environment, dissolving a compound containing iridium and chlorine in water to prepare an iridium solution; S2, adding cyclooctadiene to the iridium solution and stirring evenly;

[0005] S3, slowly adding a reducing agent dropwise to carry out a reduction reaction, and adding dropwise until no more precipitate is generated; S4, filtering the solution obtained in S3, washing the solid with water, and then evaporating and crystallizing to obtain [IrCl(C 8 H 12 )] 2 .

[0006] However, the preparation method of iridium catalyst mentioned in the prior art requires high cost of raw materials, and the reducing agent needs to be added dropwise while stirring during the preparation process, and the operation of the preparation process is complicated. Therefore, it is necessary to design a preparation method and application of a highly active supported PtIr alloy OER catalyst. Summary of the invention

[0007] The object of the present invention is to provide a preparation method and application of a highly active supported PtIr alloy OER catalyst to solve the problems in the prior art.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A method for preparing a highly active supported PtIr alloy OER catalyst, the preparation method comprising the following steps:

[0010] S1. Prepare a carrier: ultrasonically disperse titanium oxide in a mixed solution of water and a reducing agent, add a platinum precursor, mix well, and reflux to obtain a black carrier;

[0011] S2, load annealing: the black support obtained in S1 and the iridium precursor are mixed evenly in a reducing agent, and annealed in air to obtain a black powder;

[0012] S3, washing and drying: the black powder obtained in S2 is centrifugally washed, and finally dried to obtain the PtIrTi compound catalyst.

[0013] Furthermore, the raw materials for preparing the catalyst are as follows: 0.2g-5g titanium oxide, water, 5ml-50ml iridium precursor, 10ml-100ml platinum precursor, reducing agent, and air.

[0014] The ratio of water to reducing agent is 1:0.5-1:2.

[0015] Furthermore, the iridium precursor is one of iridium chloride, chloroiridic acid, chloroiridate and iridium acetate.

[0016] The platinum precursor is one of platinum oxide, platinum chloride, chloroplatinic acid, chloroplatinate and tetracyanoplatinum.

[0017] Furthermore, the reducing agent may be selected from one or more of sodium ascorbate, sodium citrate, methanol, sodium borohydride, ethylene glycol and ethanol, and the concentration of the reducing agent is 50%-99%.

[0018] Furthermore, the air is one of nitrogen, carbon dioxide and oxygen.

[0019] Furthermore, the temperature range of the reflux treatment in S1 is 80-150° C., and the treatment time is 12 hours.

[0020] Furthermore, the annealing temperature in S2 is 100-150°C.

[0021] Furthermore, the annealing time in S2 is 1-5 hours.

[0022] Furthermore, the catalyst performance test operation of the preparation method is: at 0.5 MH 2 SO 4The test was carried out in an electrolyte solution of 200 μg / cm2, with mercurous sulfate, platinum wire and glassy carbon electrode as the reference electrode, counter electrode and working electrode respectively in the three-electrode system; then the oxygen evolution performance of the catalytic material was tested in the potential range of 0.78-0.92 V by linear sweep voltammetry at a scan rate of 50 mV·s -1 ; The formula for calculating the overpotential of the oxygen evolution reaction is as follows: η=E+0.652-1.23V.

[0023] A method for preparing a highly active supported PtIr alloy OER catalyst and application of the obtained highly active supported PtIr alloy OER catalyst in electrochemical catalysis.

[0024] Beneficial effects of the present invention:

[0025] 1. The present invention has a highly active PtIr-based electrode catalyst, which is widely used in electrochemical reactions, especially in the catalytic oxidation process of electrolyzed water, showing excellent performance. The activity of the catalyst is not only higher than that of a single platinum or iridium catalyst, but also shows better durability; the structure and performance are optimized to improve the electrocatalytic efficiency of the catalyst, and the conductivity is good. Good conductivity ensures the rapid progress of the electrode reaction, thereby improving the overall energy conversion efficiency.

[0026] 2. The method for preparing a highly active PtIr-based electrode catalyst of the present invention helps to reduce energy costs and achieve low-carbon economy and sustainable development goals. The provided PtIrTi compound catalyst has high activity and excellent conductivity. The preparation method has simple operation steps and production equipment, has high safety and reliability, low preparation cost, and is suitable for large-scale industrial production and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a schematic diagram of the preparation process of the PtIr-based electrode catalyst of the present invention;

[0029] Figure 2 TEM test images of catalysts of Examples 1 to 4 of the present invention;

[0030] Figure 3 This is a catalyst mapping test diagram of Example 1 of the present invention;

[0031] Figure 4 This is a catalyst mapping test diagram of Example 4 of the present invention;

[0032] Figure 5 is a performance evaluation diagram of the catalyst in Example 1 of the present invention;

[0033] Figure 6is a performance evaluation diagram of the catalysts of Examples 2 to 4 of the present invention;

[0034] Figure 7 It is the test report of the catalyst of Examples 1 to 4 of the present invention;

[0035] Figure 8 These are the XRF test results of the catalysts of Examples 1 to 4 of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] A high-activity supported PtIr alloy OER catalyst. The raw materials required for preparing the catalyst are: 0.2g-5g titanium oxide, water, 5ml-50ml iridium precursor, 10ml-100ml platinum precursor, reducing agent and air.

[0038] The ratio of water to reducing agent is 1:0.5-1:2, and the concentration of reducing agent is 50%-99%.

[0039] The iridium precursor is one of iridium chloride, chloroiridic acid, chloroiridate and iridium acetate.

[0040] The platinum precursor is one of platinum oxide, platinum chloride, chloroplatinic acid, chloroplatinate and tetracyanoplatinum.

[0041] The reducing agent can be selected from one or more of sodium ascorbate, sodium citrate, methanol, sodium borohydride, ethylene glycol and ethanol.

[0042] The above-mentioned air is one of nitrogen, carbon dioxide and oxygen.

[0043] like Figure 1-Figure 8 As shown, a method for preparing a highly active supported PtIr alloy OER catalyst comprises the following steps:

[0044] S1. Preparation of carrier

[0045] Titanium oxide is ultrasonically dispersed in a mixed solution of water and a reducing agent, a platinum precursor is added, and after being mixed evenly, the mixture is refluxed at 80-150° C. for 12 hours to obtain a black carrier.

[0046] S2, load annealing

[0047] The black carrier obtained in S1 is mixed evenly with the iridium precursor in a reducing agent solution, and annealed in air at 100-150° C. for 1-5 hours to obtain a black powder.

[0048] S3, washing and drying

[0049] The black powder obtained in S2 is centrifugally washed and finally dried to obtain a PtIrTi compound catalyst.

[0050] S4. Testing

[0051] Performance evaluation: OER electrochemical tests were performed using a CHI-660E electrochemical workstation at 0.5 MH 2 SO 4 The test was carried out in an electrolyte solution. In the three-electrode system, mercurous sulfate, platinum wire and glassy carbon electrode were used as the reference electrode, counter electrode and working electrode respectively.

[0052] Then, the oxygen evolution performance of the catalytic materials was tested by linear sweep voltammetry (LSV) in the potential range of 0.78-0.92 V at a scan rate of 50 mV·s -1 ;

[0053] The overpotential calculation formula for the oxygen evolution reaction (OER) is as follows: η=E+0.652-1.23V.

[0054] Example 1

[0055] A method for preparing a high-activity PtIr alloy OER catalyst, the preparation method comprising the following steps:

[0056] S1. Preparation

[0057] 10 ml of chloroplatinic acid with a concentration of 100 mg / ml was ultrasonically dispersed in a mixed solution of water and ethanol, and after mixing evenly, the mixture was refluxed at 95° C. for 12 hours to obtain a black carrier.

[0058] The ratio of water to ethanol is: water: alcohol = 1:1.

[0059] S2, Annealing

[0060] The black powder obtained in S1 was mixed evenly with 18.4 ml of chloroiridic acid having a concentration of 200 mg / ml in a pure ethanol solution, and annealed at 120° C. in air for 3 hours to obtain a black powder.

[0061] S2. Washing and drying

[0062] The black powder obtained in S2 is centrifugally washed and finally dried to obtain a PtIr alloy catalyst.

[0063] S4. Testing

[0064] The catalyst slurry was prepared by using 4 mg catalyst + 2 ml deionized water + 5‰ perfluorinated sulfonate (nafion) + 2 mL isopropanol. The glassy carbon electrode used had an area of ​​0.07 cm 2 The catalyst was tested at a current density of 10 mA cm -2 The overpotential under is 307mV.

[0065] Example 2

[0066] A method for preparing a highly active supported PtIr alloy OER catalyst, the preparation method comprising the following steps:

[0067] S1. Preparation of carrier

[0068] After 0.6 g of titanium oxide was ultrasonically dispersed in a mixed solution of water and ethanol, 10 ml of chloroplatinic acid with a concentration of 100 mg / ml was added, and after mixing evenly, the mixture was refluxed at 95° C. for 12 hours to obtain a black carrier.

[0069] The ratio of water to ethanol is: water: alcohol = 1:1.

[0070] S2, load annealing

[0071] The black carrier obtained in S1 was mixed evenly with 12.3 ml of chloroiridic acid having a concentration of 200 mg / ml in a pure ethanol solution, and annealed at 120° C. in air for 3 hours to obtain a black powder.

[0072] S3, washing and drying

[0073] The black powder obtained in S2 is centrifugally washed and finally dried to obtain a PtIrTi compound catalyst.

[0074] S4. Testing

[0075] The catalyst slurry was prepared by using 4 mg catalyst + 2 ml deionized water + 5‰ perfluorinated sulfonate (nafion) + 2 mL isopropanol. The glassy carbon electrode used had an area of ​​0.07 cm 2 The catalyst was tested at a current density of 10 mA cm -2 The overpotential under is 273mV.

[0076] Example 3

[0077] A method for preparing a highly active supported PtIr alloy OER catalyst, the preparation method comprising the following steps:

[0078] S1. Preparation of carrier

[0079] After 0.6 g of titanium oxide was ultrasonically dispersed in a mixed solution of water and ethanol, 10 ml of chloroplatinic acid with a concentration of 100 mg / ml was added, and after mixing evenly, the mixture was refluxed at 95° C. for 12 hours to obtain a black carrier.

[0080] The ratio of water to ethanol is: water: alcohol = 1:1.

[0081] S2, load annealing

[0082] The black carrier obtained in S1 was mixed evenly with 7.8 ml of chloroiridic acid having a concentration of 200 mg / ml in a pure ethanol solution, and annealed at 120° C. in air for 3 hours to obtain a black powder.

[0083] S3, washing and drying

[0084] The black powder obtained in S2 is centrifugally washed and finally dried to obtain a PtIrTi compound catalyst.

[0085] S4. Testing

[0086] The catalyst slurry was prepared by using 4 mg catalyst + 2 ml deionized water + 5‰ perfluorinated sulfonate (nafion) + 2 mL isopropanol. The glassy carbon electrode used had an area of ​​0.07 cm 2 The catalyst was tested at a current density of 10 mA cm -2 The overpotential under is 268mV.

[0087] Example 4

[0088] A method for preparing a highly active supported PtIr alloy OER catalyst, the preparation method comprising the following steps:

[0089] S1. Preparation of carrier

[0090] After 0.84 g of titanium oxide was ultrasonically dispersed in a mixed solution of water and ethanol, 10 ml of chloroplatinic acid with a concentration of 100 mg / ml was added, the mixture was evenly mixed and refluxed at 95° C. for 12 hours to obtain a black carrier.

[0091] The ratio of water to ethanol is: water: alcohol = 1:1.

[0092] S2, load annealing

[0093] The black carrier obtained in S1 was mixed evenly with 18.4 ml of chloroiridic acid having a concentration of 200 mg / ml in a pure ethanol solution, and annealed at 120° C. in air for 3 hours to obtain a black powder.

[0094] S3, washing and drying

[0095] The black powder obtained in S2 is centrifugally washed and finally dried to obtain a PtIrTi compound catalyst.

[0096] S4. Testing

[0097] The catalyst slurry was prepared by using 4 mg catalyst + 2 ml deionized water + 5‰ perfluorinated sulfonate (nafion) + 2 mL isopropanol. The glassy carbon electrode used had an area of ​​0.07 cm 2 The catalyst was tested at a current density of 10 mA cm -2 The overpotential under is 278mV.

[0098] Example 5

[0099] A method for preparing a highly active supported PtIr alloy OER catalyst, the preparation method comprising the following steps:

[0100] S1. Preparation of carrier

[0101] After 1 g of titanium oxide was ultrasonically dispersed in a mixed solution of water and ethanol, 10 ml of chloroplatinic acid with a concentration of 100 mg / ml was added, the mixture was evenly mixed and refluxed at 95° C. for 12 hours to obtain a black carrier.

[0102] The ratio of water to ethanol is: water: alcohol = 1:1.

[0103] S2, load annealing

[0104] The black carrier obtained in S1 was mixed evenly with 18.4 ml of chloroiridic acid having a concentration of 200 mg / ml in a pure ethanol solution, and annealed at 120° C. in air for 3 hours to obtain a black powder.

[0105] S3, washing and drying

[0106] The black powder obtained in S2 is centrifugally washed and finally dried to obtain a PtIrTi compound catalyst.

[0107] S4. Testing

[0108] The catalyst slurry was prepared by using 4 mg catalyst + 2 ml deionized water + 5‰ perfluorinated sulfonate (nafion) + 2 mL isopropanol. The glassy carbon electrode used had an area of ​​0.07 cm 2 The catalyst was tested at a current density of 10 mA cm -2 The overpotential is 315mV.

[0109] Example 6

[0110] A method for preparing a highly active supported PtIr alloy OER catalyst, the preparation method comprising the following steps:

[0111] S1. Preparation of carrier

[0112] After 0.2 g of titanium oxide was ultrasonically dispersed in a mixed solution of water and ethanol, 10 ml of chloroplatinic acid with a concentration of 100 mg / ml was added, and after mixing evenly, the mixture was refluxed at 95° C. for 12 hours to obtain a black carrier.

[0113] The ratio of water to ethanol is: water: alcohol = 1:1.

[0114] S2, load annealing

[0115] The black carrier obtained in S1 was mixed evenly with 5 ml of chloroiridic acid with a concentration of 200 mg / ml in a pure ethanol solution, and annealed in air at 120° C. for 3 hours to obtain a black powder.

[0116] S3, washing and drying

[0117] The black powder obtained in S2 is centrifugally washed and finally dried to obtain a PtIrTi compound catalyst.

[0118] S4. Testing

[0119] The catalyst slurry was prepared by using 4 mg catalyst + 2 ml deionized water + 5‰ perfluorinated sulfonate (nafion) + 2 mL isopropanol. The glassy carbon electrode used had an area of ​​0.07 cm 2 The catalyst was tested at a current density of 10 mA cm -2 The overpotential is 280mV.

[0120] Example 7

[0121] A method for preparing a highly active supported PtIr alloy OER catalyst, the preparation method comprising the following steps:

[0122] S1. Preparation of carrier

[0123] After 0.6 g of titanium oxide was ultrasonically dispersed in a mixed solution of water and ethanol, 20 ml of chloroplatinic acid with a concentration of 100 mg / ml was added, and the mixture was evenly mixed and refluxed at 95° C. for 12 hours to obtain a black carrier.

[0124] The ratio of water to ethanol is: water: alcohol = 1:1.

[0125] S2, load annealing

[0126] The black carrier obtained in S1 was mixed evenly with 18.4 ml of chloroiridic acid having a concentration of 200 mg / ml in a pure ethanol solution, and annealed at 120° C. in air for 3 hours to obtain a black powder.

[0127] S3, washing and drying

[0128] The black powder obtained in S2 is centrifugally washed and finally dried to obtain a PtIrTi compound catalyst.

[0129] S4. Testing

[0130] The catalyst slurry was prepared by using 4 mg catalyst + 2 ml deionized water + 5‰ perfluorinated sulfonate (nafion) + 2 mL isopropanol. The glassy carbon electrode used had an area of ​​0.07 cm 2 The catalyst was tested at a current density of 10 mA cm -2 The overpotential under is 293mV.

[0131] Example 8

[0132] A method for preparing a highly active supported PtIr alloy OER catalyst, the preparation method comprising the following steps:

[0133] S1. Preparation of carrier

[0134] After 0.6 g of titanium oxide was ultrasonically dispersed in a mixed solution of water and ethanol, 30 ml of chloroplatinic acid with a concentration of 100 mg / ml was added, and after mixing evenly, the mixture was refluxed at 95° C. for 12 hours to obtain a black carrier.

[0135] The ratio of water to ethanol is: water: alcohol = 1:1.

[0136] S2, load annealing

[0137] The black carrier obtained in S1 was mixed evenly with 18.4 ml of chloroiridic acid having a concentration of 200 mg / ml in a pure ethanol solution, and annealed at 120° C. in air for 3 hours to obtain a black powder.

[0138] S3, washing and drying

[0139] The black powder obtained in S2 is centrifugally washed and finally dried to obtain a PtIrTi compound catalyst.

[0140] S4. Testing

[0141] The catalyst slurry was prepared by using 4 mg catalyst + 2 ml deionized water + 5‰ perfluorinated sulfonate (nafion) + 2 mL isopropanol. The glassy carbon electrode used had an area of ​​0.07 cm 2 The catalyst was tested at a current density of 10 mA cm -2 The overpotential under is 284mV.

[0142] Example 9

[0143] A method for preparing a highly active supported PtIr alloy OER catalyst, the preparation method comprising the following steps:

[0144] S1. Preparation of carrier

[0145] After 0.6 g of titanium oxide was ultrasonically dispersed in a mixed solution of water and ethanol, 10 ml of chloroplatinic acid with a concentration of 100 mg / ml was added, and after mixing evenly, the mixture was refluxed at 95° C. for 12 hours to obtain a black carrier.

[0146] The ratio of water to ethanol is: water: alcohol = 1:1.

[0147] S2, load annealing

[0148] The black carrier obtained in S1 was mixed evenly with 18.4 ml of chloroiridic acid having a concentration of 200 mg / ml in a pure ethanol solution, and annealed at 100° C. for 3 hours in air to obtain a black powder.

[0149] S3, washing and drying

[0150] The black powder obtained in S2 is centrifugally washed and finally dried to obtain a PtIrTi compound catalyst.

[0151] S4. Testing

[0152] The catalyst slurry was prepared by using 4 mg catalyst + 2 ml deionized water + 5‰ perfluorinated sulfonate (nafion) + 2 mL isopropanol. The glassy carbon electrode used had an area of ​​0.07 cm 2 The catalyst was tested at a current density of 10 mA cm -2 The overpotential is 320mV.

[0153] The catalyst of the invention is prepared by a reflux method, by first preparing a titanium-platinum carrier and then loading iridium on the titanium-platinum carrier, so as to prepare a loaded PtIrTi catalyst with high activity and excellent conductivity.

[0154] Specifically, the black carrier is obtained by ultrasonically dispersing the carrier in water, adding a platinum precursor and a reducing agent, and heating and refluxing the mixture. The iridium precursor and the black carrier are then mixed evenly in a reducing agent solution, and the product obtained by the reaction is subjected to rotary evaporation and annealing in the air. The obtained powder is then centrifugally washed and finally dried to obtain a PtIrTi compound catalyst.

[0155] The platinum precursor in the raw materials used provides a platinum source, and the iridium precursor provides an iridium source. The prepared catalyst is tested for oxygen evolution performance. The overpotential of the oxygen evolution reaction of the catalyst prepared in Examples 1-9 is not higher than 320 mV. The catalyst has a good overall application prospect in the field of electrochemistry, promotes the development of electrolysis of water in electrolyzer technology, helps to reduce energy costs, and achieve low-carbon economy and sustainable development goals.

[0156] In Examples 1-4 of the present invention, a catalyst material in which PtIr alloy nanoparticles are uniformly distributed on a carrier is obtained by a simple preparation method, such as Figure 2-Figure 4 As shown; at the same time Figure 5 As shown in the figure, the PtIr alloy catalyst in Example 1 has a current density of 10 mA·cm -2 The overpotential under the condition of 10 mA·cm -2 The overpotential under the conditions is lower than 280 mV; in addition, the supported PtIr alloy OER catalyst prepared by the present invention has high purity and low water content. Figure 6 and Figure 7 As shown; the supported PtIr alloy OER catalysts in Examples 2-4 have lower Ir loading and higher catalytic activity, which can solve the high cost problem of water electrolysis that has long relied on iridium oxide.

[0157] The supported PtIrTi catalyst provided by the present invention has the characteristics of high activity and excellent conductivity. The preparation method of the present invention has simple operation steps and production equipment, has high safety and reliability, low preparation cost, and is suitable for large-scale industrial production and application.

[0158] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for preparing a highly active supported PtIr alloy OER catalyst, characterized in that: The preparation method comprises the following steps: S1. Prepare a carrier: ultrasonically disperse titanium oxide in a mixed solution of water and a reducing agent, add a platinum precursor, mix well, and reflux to obtain a black carrier; S2, load annealing: the black support obtained in S1 and the iridium precursor are mixed evenly in a reducing agent, and annealed in air to obtain a black powder; S3, washing and drying: the black powder obtained in S2 is centrifugally washed, and finally dried to obtain the PtIrTi compound catalyst.

2. The method for preparing a highly active supported PtIr alloy OER catalyst according to claim 1, characterized in that: The raw materials for catalyst preparation are as follows: 0.2g-5g titanium oxide, water, 5ml-50ml iridium precursor, 10ml-100ml platinum precursor, reducing agent, air; The ratio of water to reducing agent is 1:0.5-1:

2.

3. The method for preparing a highly active supported PtIr alloy OER catalyst according to claim 2, characterized in that: The iridium precursor is one of iridium chloride, chloroiridic acid, chloroiridate and iridium acetate; The platinum precursor is one of platinum oxide, platinum chloride, chloroplatinic acid, chloroplatinate and tetracyanoplatinum.

4. The method for preparing a highly active supported PtIr alloy OER catalyst according to claim 2, characterized in that: The reducing agent can be selected from one or more of sodium ascorbate, sodium citrate, methanol, sodium borohydride, ethylene glycol and ethanol, and the concentration of the reducing agent is 50%-99%.

5. The method for preparing a highly active supported PtIr alloy OER catalyst according to claim 2, characterized in that: The air is one of nitrogen, carbon dioxide and oxygen.

6. The method for preparing a highly active supported PtIr alloy OER catalyst according to claim 1, characterized in that: The temperature range of the reflux treatment in S1 is 80-150° C., and the treatment time is 12 hours.

7. The method for preparing a highly active supported PtIr alloy OER catalyst according to claim 1, characterized in that: The annealing temperature in S2 is 100-150°C.

8. The method for preparing a highly active supported PtIr alloy OER catalyst according to claim 7, characterized in that: The annealing time in S2 is 1-5 hours.

9. The method for preparing a highly active supported PtIr alloy OER catalyst according to claim 1, characterized in that: The catalyst performance test operation of the preparation method is as follows: testing in a 0.5M H2SO4 electrolyte solution, with mercurous sulfate, platinum wire and glassy carbon electrode as reference electrode, counter electrode and working electrode respectively in a three-electrode system; Then, the oxygen evolution performance of the catalytic materials was tested by linear sweep voltammetry in the potential range of 0.78-0.92 V at a scan rate of 50 mV·s -1 ; The formula for calculating the overpotential of the oxygen evolution reaction is as follows: η=E+0.652-1.23V.

10. Use of a highly active supported PtIr alloy OER catalyst obtained by the preparation method of a highly active supported PtIr alloy OER catalyst according to any one of claims 1 to 9 in electrochemical catalysis.

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