Anti-phosphoric-acid platinum-based catalyst and preparation method and application thereof

Abstract

The invention discloses an anti-phosphoric-acid platinum-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of fuel cells. The preparation method of the anti-phosphoric acid platinum-based catalyst comprises the following steps: mixing a carbon-supported platinum catalyst and molybdate in ethylene glycol, and carrying out condensation reflux to obtain a molybdenum oxide modified carbon-supported platinum catalyst; mixing the molybdenum oxide modified carbon-supported platinum catalyst and dopamine hydrochloride in a buffer solution, stirring for the first time, adding transition metal salt, stirring for the second time, performing suction filtration, and drying to obtain a pretreated molybdenum oxide modified platinum-based alloy catalyst; and carrying out annealing treatment on the pretreated molybdenum oxide modified platinum-based alloy catalyst to obtain the anti-phosphoric acid platinum-based catalyst. The anti-phosphoric acid platinum-based catalyst has excellent oxygen reduction initial activity, anti-phosphoric acid performance and electrochemical stability, and can effectively solve the problem of phosphoric acid poisoning of a platinum-based catalyst of a high-temperature proton exchange membrane fuel cell.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cells, and in particular relates to a platinum phosphate-resistant catalyst and a preparation method and application thereof. Background Art

[0002] Proton exchange membrane fuel cells (PEMFC) are one of the important application outlets at the end of the future hydrogen energy industry chain. The operating temperature of ordinary proton exchange membrane fuel cells is generally controlled at 80°C. However, at this operating temperature, impurities (CO and H2S, etc.) are usually present in the fuel gas (H2). These impurities can cause the platinum-based catalysts (Pt-based catalysts) widely used in fuel cells to be poisoned, resulting in a serious decline in fuel cell performance.

[0003] Based on this, high-temperature proton exchange membrane fuel cells (HT-PEMFC) were derived. The advantage of HT-PEMFC under high-temperature working conditions is not only that the Pt-based catalyst is not easily poisoned by gaseous toxic molecules, but also has a higher catalytic conversion efficiency. However, in the current manufacturing process of high-temperature proton exchange membrane fuel cells, the use of phosphoric acid-doped polybiphenylimidazole (PBI) membrane as a proton exchange membrane is an indispensable step, but this also leads to the problem of phosphoric acid leaching, which will inevitably have a poisoning effect on the Pt-based catalyst. Therefore, the development of Pt-based catalysts with high catalytic activity and high resistance to phosphoric acid poisoning is of great significance for the commercialization of proton exchange membrane fuel cells. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a phosphate-resistant platinum-based catalyst and a preparation method and application thereof, so as to solve the phosphoric acid poisoning problem of platinum-based catalysts in high-temperature proton exchange membrane fuel cells.

[0005] The technical solution adopted to solve the technical problem is to provide a method for preparing a platinum phosphate-resistant catalyst, comprising the following steps:

[0006] (1) mixing a carbon-supported platinum catalyst and a molybdate in ethylene glycol for condensation and reflux to obtain a carbon-supported platinum catalyst modified with molybdenum oxide;

[0007] (2) mixing the molybdenum oxide-modified carbon-supported platinum catalyst and dopamine hydrochloride in a buffer solution and stirring for the first time, then adding a transition metal salt and stirring for the second time, filtering and drying to obtain a pretreated molybdenum oxide-modified platinum-based alloy catalyst;

[0008] (3) The platinum-based alloy catalyst modified by the pre-treated molybdenum oxide is annealed to obtain a phosphate-resistant platinum-based catalyst.

[0009] The beneficial effect of the above technical solution adopted in the present invention is that the phosphate-resistant platinum-based catalyst obtained by the preparation method of the present invention has the advantages of high oxygen reduction catalytic activity, low phosphoric acid adsorption capacity and resistance to phosphoric acid poisoning compared with traditional carbon-supported platinum catalysts or other platinum alloy catalysts. In the present invention, molybdate is reduced to partially amorphous molybdenum oxide by ethylene glycol to modify the platinum catalyst. Amorphous oxide is a special oxide with weak crystallinity and cannot be detected by conventional X-ray diffraction (XRD). This type of oxide has the characteristics of being loose and porous and rich in oxygen-containing groups on the surface. These oxygen-containing groups can repel oxygen in phosphoric acid molecules and hinder the adsorption of phosphate, thereby alleviating phosphoric acid poisoning on the platinum surface. By controlling the morphology and thickness of this amorphous oxide layer on the catalyst surface, it is possible to optimize and improve the phosphoric acid resistance of platinum without affecting the catalyst activity. The self-polymerization of dopamine hydrochloride is then utilized to form a dopamine shell thin layer on the surface of carbon-supported platinum modified with molybdenum oxide, and the incorporated transition metal salt is adsorbed into the polydopamine, which is then alloyed with platinum through the thermal diffusion effect of annealing treatment. Regulating the electronic structure of the platinum catalyst can effectively improve the oxygen reduction performance of platinum.

[0010] Preferably, the molybdate is ammonium molybdate heptahydrate or anhydrous ammonium molybdate; and the transition metal salt is ferric nitrate, nickel nitrate, cobalt nitrate, ferric chloride, nickel chloride or cobalt chloride.

[0011] More preferably, the molybdate is ammonium molybdate heptahydrate; and the transition metal salt is iron nitrate, nickel nitrate or cobalt nitrate.

[0012] Preferably, the buffer solution is a Tris-HCl buffer with a pH of 8.5-9.

[0013] More preferably, the buffer solution is a Tris-HCl buffer with a pH of 9.

[0014] Preferably, the condensation reflux temperature in step (1) is 150-170° C., and the time is 2.5-3.5 h; and the condensation reflux is carried out under oil bath conditions.

[0015] More preferably, the condensation reflux temperature in step (1) is 160° C. and the time is 3 h.

[0016] Preferably, in step (1), the material-liquid ratio of the carbon-supported platinum catalyst, molybdate and ethylene glycol is (1-2) g: (12.5-13) g: (20-40) mL.

[0017] More preferably, in step (1), the solid-liquid ratio of the carbon-supported platinum catalyst, molybdate and ethylene glycol is 1.5 g:12.8 g:20 mL.

[0018] Preferably, in step (2), the solid-liquid ratio of the molybdenum oxide-modified carbon-supported platinum catalyst, dopamine hydrochloride, transition metal salt and buffer solution is (18-22) mg: (3.5-4) mg: (3-5) mg: 2 mL.

[0019] More preferably, in step (2), the solid-liquid ratio of the molybdenum oxide-modified carbon-supported platinum catalyst, dopamine hydrochloride, transition metal salt and buffer solution is 10 mg:2 mg:2-2.2 mg:1 mL.

[0020] More preferably, in step (2), the solid-liquid ratio of the molybdenum oxide-modified carbon-supported platinum catalyst, dopamine hydrochloride, transition metal salt and buffer solution is 10 mg:2 mg:2 mg:1 mL.

[0021] Preferably, in step (2), the first stirring and the second stirring are both performed for 10 to 14 hours; the drying temperature is 65 to 75° C., and the drying time is 12 to 14 hours.

[0022] More preferably, in step (2), the first stirring and the second stirring are both performed for 12 h; the drying temperature is 70° C. and the drying time is 12 h.

[0023] Preferably, the annealing treatment conditions in step (3) are: the volume ratio of atmosphere H2:N2 is 1-2:8-9, the heating rate is 4-6°C / min, the annealing temperature is 650-750°C, and the annealing time is 1.5-2.5h.

[0024] More preferably, the annealing treatment conditions in step (3) are: the volume ratio of atmosphere H2:N2 is 1:9, the heating rate is 5°C / min, the annealing temperature is 700°C, and the annealing time is 2h.

[0025] The present invention also provides a platinum phosphate-resistant catalyst prepared by the above preparation method.

[0026] The present invention also provides the use of the above-mentioned anti-platinum phosphate-based catalyst in the preparation of high-temperature proton exchange membrane fuel cells.

[0027] The present invention has the following beneficial effects:

[0028] The phosphate-resistant platinum-based catalyst of the present invention has excellent oxygen reduction initial activity and phosphoric acid resistance. Even in a perchloric acid solution containing high-concentration phosphoric acid, its mass activity far exceeds that of a commercial carbon-supported platinum catalyst. At the same time, the phosphate-resistant platinum-based catalyst of the present invention has excellent electrochemical stability. After a long and wide range of cyclic voltammetry scanning, its mass activity retention rate is still relatively outstanding. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1The transmission electron microscope images of the platinum phosphate-resistant cobalt catalyst prepared in Example 1; wherein (a) is a bright field image; (b) is a dark field image;

[0030] Figure 2 The EDS element distribution diagram of the platinum phosphate-resistant cobalt catalyst prepared in Example 1; wherein, (a) is the Pt element distribution diagram; (b) is the Co element distribution diagram; (c) is the Mo element distribution diagram; (d) is the C element distribution diagram; (e) is the N element distribution diagram; (f) is the O element distribution diagram;

[0031] Figure 3 This is the XRD pattern of the platinum phosphate-resistant cobalt catalyst prepared in Example 1;

[0032] Figure 4 Figures 2 and 3 are test results of phosphoric acid resistance of different platinum-based catalysts; (a) is the phosphate-resistant platinum cobalt catalyst prepared in Example 1; (b) is the phosphate-resistant platinum iron catalyst prepared in Example 2; (c) is the phosphate-resistant platinum nickel catalyst prepared in Example 3; (d) is a commercial carbon-supported platinum catalyst;

[0033] Figure 5 The graphs are the results of mass activity tests of different platinum-based catalysts; wherein (a) is the initial activity; (b) is the performance of the platinum-cobalt catalyst prepared in Example 1 in a solution containing 5 mM phosphoric acid;

[0034] Figure 6 The figures are the results of the phosphoric acid resistance test of the platinum-based catalysts prepared in the comparative examples; wherein (a) is the phosphoric acid resistance platinum-based catalyst prepared in comparative example 1; (b) is the phosphoric acid resistance platinum-based catalyst prepared in comparative example 2;

[0035] Figure 7 The accelerated aging test results of different platinum-based catalysts are shown in FIG. 1 ; wherein (a) is the platinum phosphate-resistant cobalt catalyst prepared in Example 1; (b) is a commercial carbon-supported platinum catalyst;

[0036] Figure 8 This is a graph showing the mass activity test results of different platinum-based catalysts before and after aging. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below in conjunction with the examples, which are only used to explain the present invention and are not intended to limit the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to conventional conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0038] Example 1

[0039] A method for preparing a platinum phosphate-resistant cobalt catalyst comprises the following steps:

[0040] (1) 1.5 g of a carbon-supported platinum catalyst and 12.8 g of ammonium molybdate heptahydrate were weighed and mixed in 20 mL of ethylene glycol to obtain a mixed solution, and the mixed solution was condensed and refluxed in an oil bath at 160° C. for 3 h to obtain a carbon-supported platinum catalyst modified with molybdenum oxide;

[0041] (2) 200 mg of molybdenum oxide-modified carbon-supported platinum catalyst and 40 mg of dopamine hydrochloride were mixed in 20 mL of Tris-HCl buffer with a pH of 9 and stirred for 12 h for the first time, and then 40 mg of cobalt nitrate was added and stirred for a second time for 12 h, and then filtered and the filter cake was collected, and the filter cake was placed in an oven at 70° C. and dried for 12 h to obtain a pretreated molybdenum oxide-modified platinum-cobalt alloy catalyst;

[0042] (3) In an atmosphere of H2:N2 with a volume ratio of 1:9, the pretreated molybdenum oxide modified platinum-cobalt alloy catalyst was heated to 700°C at a heating rate of 5°C / min and kept at this temperature for 2 hours for annealing treatment to obtain a platinum-cobalt phosphate-resistant catalyst.

[0043] Example 2

[0044] A method for preparing a platinum iron phosphate resistant catalyst comprises the following steps:

[0045] (1) 1.5 g of a carbon-supported platinum catalyst and 12.8 g of ammonium molybdate heptahydrate were weighed and mixed in 20 mL of ethylene glycol to obtain a mixed solution, and the mixed solution was condensed and refluxed in an oil bath at 160° C. for 3 h to obtain a carbon-supported platinum catalyst modified with molybdenum oxide;

[0046] (2) 200 mg of molybdenum oxide-modified carbon-supported platinum catalyst and 40 mg of dopamine hydrochloride were mixed in 20 mL of Tris-HCl buffer with a pH of 9 and stirred for 12 h, and then 42 mg of ferric nitrate was added and stirred for a second time for 12 h, and then filtered and the filter cake was collected, and the filter cake was placed in an oven at 70° C. and dried for 12 h to obtain a pretreated molybdenum oxide-modified platinum-iron alloy catalyst;

[0047] (3) In an atmosphere of H2:N2 with a volume ratio of 1:9, the pretreated molybdenum oxide modified platinum-iron alloy catalyst was heated to 700°C at a heating rate of 5°C / min and kept at this temperature for 2 h for annealing treatment to obtain a platinum phosphate-resistant iron catalyst.

[0048] Example 3

[0049] A method for preparing a platinum phosphate-resistant nickel catalyst comprises the following steps:

[0050] (1) 1.5 g of a carbon-supported platinum catalyst and 12.8 g of ammonium molybdate heptahydrate were weighed and mixed in 20 mL of ethylene glycol to obtain a mixed solution, and the mixed solution was condensed and refluxed in an oil bath at 160° C. for 3 h to obtain a carbon-supported platinum catalyst modified with molybdenum oxide;

[0051] (2) 200 mg of molybdenum oxide-modified carbon-supported platinum catalyst and 40 mg of dopamine hydrochloride were mixed in 20 mL of Tris-HCl buffer with a pH of 9 and stirred for 12 h, and then 44 mg of nickel nitrate was added and stirred for a second time for 12 h, and then filtered and the filter cake was collected, and the filter cake was placed in an oven at 70° C. and dried for 12 h to obtain a pretreated molybdenum oxide-modified platinum-nickel alloy catalyst;

[0052] (3) In an atmosphere of H2:N2 with a volume ratio of 1:9, the pretreated molybdenum oxide modified platinum-nickel alloy catalyst was heated to 700°C at a heating rate of 5°C / min and kept at this temperature for 2 h for annealing treatment to obtain a phosphate-resistant platinum-nickel catalyst.

[0053] Example 4

[0054] A method for preparing a platinum phosphate-resistant cobalt catalyst comprises the following steps:

[0055] (1) Weighing 1 g of a carbon-supported platinum catalyst and 12.5 g of ammonium molybdate heptahydrate, mixing them in 20 mL of ethylene glycol to obtain a mixed solution, and then condensing and refluxing the mixed solution in an oil bath at 150° C. for 3.5 h to obtain a carbon-supported platinum catalyst modified with molybdenum oxide;

[0056] (2) 180 mg of molybdenum oxide-modified carbon-supported platinum catalyst and 35 mg of dopamine hydrochloride were mixed in 20 mL of Tris-HCl buffer with a pH of 8.5 and stirred for 10 h for the first time, and then 40 mg of cobalt nitrate was added and stirred for a second time for 10 h, and then the filter cake was filtered and collected, and the filter cake was placed in an oven at 65° C. and dried for 14 h to obtain a pretreated molybdenum oxide-modified platinum-cobalt alloy catalyst;

[0057] (3) In an atmosphere of H2:N2 with a volume ratio of 2:8, the pretreated molybdenum oxide modified platinum-cobalt alloy catalyst was heated to 650°C at a heating rate of 4°C / min and kept at this temperature for 2 h for annealing treatment to obtain a platinum-cobalt phosphate-resistant catalyst.

[0058] Example 5

[0059] A method for preparing a platinum phosphate-resistant cobalt catalyst comprises the following steps:

[0060] (1) Weighing 2 g of a carbon-supported platinum catalyst and 13 g of ammonium molybdate heptahydrate, mixing them in 40 mL of ethylene glycol to obtain a mixed solution, and then condensing and refluxing the mixed solution in an oil bath at 170° C. for 2.5 h to obtain a carbon-supported platinum catalyst modified with molybdenum oxide;

[0061] (2) 220 mg of molybdenum oxide-modified carbon-supported platinum catalyst and 35 mg of dopamine hydrochloride were mixed in 20 mL of Tris-HCl buffer with a pH of 9 and stirred for 14 h for the first time, and then 40 mg of cobalt nitrate was added and stirred for a second time for 14 h, and then the filter cake was filtered and collected, and the filter cake was placed in an oven at 75° C. and dried for 14 h to obtain a pretreated molybdenum oxide-modified platinum-cobalt alloy catalyst;

[0062] (3) In an atmosphere of H2:N2 with a volume ratio of 1:9, the pretreated molybdenum oxide modified platinum-cobalt alloy catalyst was heated to 750°C at a heating rate of 6°C / min and kept at this temperature for 2 h for annealing treatment to obtain a platinum-cobalt phosphate-resistant catalyst.

[0063] Comparative Example 1

[0064] A method for preparing a platinum phosphate-resistant catalyst comprises the following steps:

[0065] (1) Weighing 200 mg of carbon-supported platinum catalyst and 40 mg of dopamine hydrochloride, mixing them in 20 mL of Tris-HCl buffer with a pH of 9, stirring for 12 hours, then adding 40 mg of cobalt nitrate, stirring for 12 hours, and then filtering and collecting the filter cake, and drying the filter cake in an oven at 70° C. for 12 hours to obtain a pretreated platinum-cobalt alloy catalyst;

[0066] (2) In an atmosphere of H2:N2 with a volume ratio of 1:9, the pretreated platinum-cobalt alloy catalyst was heated to 700°C at a heating rate of 5°C / min and kept at this temperature for 2 h for annealing treatment to obtain a platinum phosphate-resistant catalyst.

[0067] Comparative Example 2

[0068] A method for preparing a platinum phosphate-resistant catalyst comprises the following steps:

[0069] (1) 1.5 g of a carbon-supported platinum catalyst and 12.8 g of ammonium molybdate heptahydrate were weighed and mixed in 20 mL of ethylene glycol to obtain a mixed solution, and the mixed solution was condensed and refluxed in an oil bath at 160° C. for 3 h to obtain a carbon-supported platinum catalyst modified with molybdenum oxide;

[0070] (2) In an atmosphere of H2:N2 with a volume ratio of 1:9, the molybdenum oxide-modified carbon-supported platinum catalyst was heated to 700°C at a heating rate of 5°C / min and kept at this temperature for 2 h for annealing treatment to obtain a platinum phosphate-resistant catalyst.

[0071] Experimental example

[0072] 1. The platinum phosphate-resistant cobalt catalyst prepared in Example 1 was subjected to transmission electron microscopy analysis, element distribution analysis and XRD analysis. The results are as follows: Figures 1 to 3 As shown. Figures 1-2 It can be seen that the signals of Pt and Co in the platinum phosphate-resistant cobalt catalyst prepared by the present invention completely overlap, indicating that Pt and Co are distributed uniformly to form a PtCo alloy; in addition, the elements of Mo and O are evenly distributed in the observed area, indicating that the surface is modified by molybdenum oxide. Figure 3 It can be seen that the XRD diffraction peak of the platinum phosphate-resistant cobalt catalyst shifts to the right, and the peak shape coincides with PDF#29-0499, indicating the formation of Pt3Co alloy without molybdenum oxide (MoO x ), indicating that molybdenum oxide is an amorphous modification layer.

[0073] 2. Perform a phosphoric acid resistance test on Examples 1 to 3, Comparative Examples 1 to 2 and commercial carbon-supported platinum catalysts in the present invention. Examples 1 to 3, Comparative Examples 1 to 2 and commercial carbon-supported platinum catalysts were placed in a perchloric acid electrolyte solution and a perchloric acid electrolyte solution containing 5 mM phosphoric acid to detect the oxygen reduction polarization curve. The specific test method is as follows: Use an electrochemical workstation to test the catalyst in a three-electrode system; first, use cyclic voltammetry (CV) to scan 30 times in a 0.1 M perchloric acid solution within the range of 0 to 1.2 V vs. RHE at a scan rate of 0.05 V / s to fully activate the catalyst; then use linear voltammetry to scan the oxygen reduction polarization curve in an oxygen-saturated electrolyte within the range of 0 to 1.1 V at a scan rate of 0.01 V / s and an electrode rotation speed of 1600 rpm. The test results are as follows: Figures 4 to 6 As shown. Figure 4 It can be seen that the anti-platinum phosphate-based catalysts prepared in Examples 1 to 3 of the present invention have strong activity and anti-phosphoric acid poisoning performance; among them, the anti-platinum phosphate cobalt catalyst prepared in Example 1 has a mass activity of 5 times that of the commercial carbon-supported platinum catalyst in a perchloric acid electrolyte solution containing 5mM phosphoric acid ( Figure 5 ); at the same time, from Figure 6 As can be seen from (a), the formation of platinum-based alloys can improve the initial activity of carbon-supported platinum (the potential after improvement is 0.925 V vs. RHE, and the half-wave potential of carbon-supported platinum is 0.890 V vs. RHE), but the catalyst that only forms platinum-based alloys has poor anti-poisoning performance (reduced by 84 mV in phosphoric acid solution); Figure 6 As can be seen in (b), the platinum catalyst modified with only molybdenum oxide can improve the anti-poisoning performance (half-wave potential drop of 24 mV in perchloric acid solution containing phosphoric acid), but the initial activity is not improved (0.884 V vs. RHE).

[0074] 3. The accelerated aging test was performed on Example 1 of the present invention and the commercial carbon-supported platinum catalyst. The specific test method was the same as the phosphoric acid resistance test. The catalyst was subjected to a 0.6-1.1V cyclic voltammetry scan in nitrogen-saturated 0.1M perchloric acid. The results are as follows: Figures 7-8 As shown. Figures 7-8 It can be seen that the platinum phosphate-resistant cobalt catalyst prepared in Example 1 of the present invention has excellent chemical stability. After 30,000 cycles of 0.6-1.1V cyclic voltammetry scanning, its mass activity only decreases by about 34%. In contrast, the mass activity of the commercial carbon-supported platinum catalyst decreases by as much as 52% after the same cyclic voltammetry scanning.

[0075] The present invention has been described according to the above embodiments. It should be understood that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the scope of the present invention.

Claims

1. A method for preparing a platinum phosphate-resistant catalyst, characterized in that: The following steps are involved: (1) mixing a carbon-supported platinum catalyst and a molybdate in ethylene glycol for condensation and reflux to obtain a carbon-supported platinum catalyst modified with molybdenum oxide; (2) mixing the molybdenum oxide-modified carbon-supported platinum catalyst and dopamine hydrochloride in a buffer solution and stirring for the first time, then adding a transition metal salt and stirring for the second time, filtering and drying to obtain a pretreated molybdenum oxide-modified platinum-based alloy catalyst; (3) The platinum-based alloy catalyst modified by the pre-treated molybdenum oxide is annealed to obtain a phosphate-resistant platinum-based catalyst.

2. The method for preparing a platinum phosphate-resistant catalyst according to claim 1, wherein: The molybdate is ammonium molybdate heptahydrate or anhydrous ammonium molybdate; the transition metal salt is ferric nitrate, nickel nitrate, cobalt nitrate, ferric chloride, nickel chloride or cobalt chloride.

3. The method for preparing a platinum phosphate-resistant catalyst according to claim 1, wherein: The buffer solution is a Tris-HCl buffer solution with a pH value of 8.5-9.

4. The method for preparing a platinum phosphate-resistant catalyst according to claim 1, wherein: The temperature of the condensation reflux in the step (1) is 150-170° C., and the time is 2.5-3.5 hours; the condensation reflux is carried out under oil bath conditions.

5. The method for preparing a platinum phosphate-resistant catalyst according to claim 1, wherein: In the step (1), the material-liquid ratio of the carbon-supported platinum catalyst, molybdate and ethylene glycol is (1-2) g: (12.5-13) g: (20-40) mL.

6. The method for preparing a platinum phosphate-resistant catalyst according to claim 1, wherein: In the step (2), the material-liquid ratio of the molybdenum oxide-modified carbon-supported platinum catalyst, dopamine hydrochloride, transition metal salt and buffer solution is (18-22) mg: (3.5-4) mg: (3-5) mg: 2 mL.

7. The method for preparing a phosphate-resistant platinum-based catalyst according to claim 1, wherein: In the step (2), the first stirring and the second stirring time are both 10 to 14 hours; the drying temperature is 65 to 75° C., and the drying time is 12 to 14 hours.

8. The method for preparing a platinum phosphate-resistant catalyst according to claim 1, wherein: The annealing treatment conditions in step (3) are as follows: the volume ratio of atmosphere H2:N2 is 1-2:8-9, the heating rate is 4-6°C / min, the annealing temperature is 650-750°C, and the annealing time is 1.5-2h.

9. A platinum-phosphate-resistant catalyst prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the resistant platinum phosphate-based catalyst according to claim 9 in the preparation of high-temperature proton exchange membrane fuel cells.

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