A high temperature fuel cell catalyst and a method for making the same

Abstract

This invention discloses a high-temperature fuel cell catalyst and its preparation method, belonging to the field of new energy catalysts. Anchoring sites are introduced into a porous carbon support through acid treatment, combined with microwave-assisted rapid reduction of the chloroplatinic acid precursor under alkaline conditions, and further supplemented by high-temperature heat treatment in an inert / reducing mixed atmosphere. This achieves high dispersion, small particle size, and strong interfacial bonding of platinum nanoparticles on the carbon support. The prepared catalyst exhibits excellent electrocatalytic activity (half-wave potential of 0.85-0.87 V), high thermal stability, and durability, effectively solving the problems of large particle size, easy agglomeration, and high-temperature performance degradation of traditional Pt / C catalysts. It can meet the demand for high-performance catalysts in high-temperature proton exchange membrane fuel cells and provide technical support for the domestic production of key materials for high-temperature fuel cells.

Description

Technical Field

[0001] This invention belongs to the field of new energy catalyst technology, and particularly relates to a high-temperature fuel cell catalyst and its preparation method. Background Technology

[0002] With rapid economic and technological development, the problems of energy depletion and environmental pollution are becoming increasingly severe worldwide, and energy and environmental protection issues urgently need to be addressed. High-temperature fuel cells, as a new type of high-efficiency power generation device with advantages such as environmental friendliness, high energy utilization, strong stability, and low industrial noise, have become a research hotspot in many countries.

[0003] High-temperature proton exchange membranes (PTMs) are crucial components of high-temperature fuel cells. They typically use air and hydrogen (or methanol) as the anode and cathode gases, respectively. High-temperature Pt / C catalysts are among the most effective hydrogen evolution catalysts for PTMs. Domestically, high-temperature Pt / C catalysts are still in the experimental stage and rely heavily on imports, which severely restricts the independent development of domestic fuel cells. Furthermore, while traditional platinum-carbon catalysts utilize a variety of activated carbon supports, the resulting catalysts tend to have larger particle sizes. Smaller catalyst particle sizes would result in a larger active surface area, significantly impacting the overall redox reaction rate of the fuel cell and thus improving its overall performance.

[0004] Therefore, it is urgent to produce a Pt / C catalyst with strong electrocatalytic activity, high stability and good heat resistance. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a high-temperature fuel cell catalyst and its preparation method.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A method for preparing a high-temperature fuel cell catalyst includes the following steps: (1) Acid treatment is performed on the porous carbon support to introduce oxygen-containing functional groups on its surface; (2) The acid-treated carbon support is mixed with chloroplatinic acid solution and reducing agent to obtain mixed solution 1; The chloroplatinic acid solution is obtained by mixing chloroplatinic acid with a reducing agent until homogeneous; (3) Add a mixture of sodium hydroxide and reducing agent to mixed solution 1 to adjust the pH of the system to 9-12 to obtain mixed solution 2; (4) The resulting mixed solution 2 was subjected to microwave heating and reflux reaction; (5) After the reaction is complete, the product is filtered, washed and freeze-dried under vacuum; (6) The product after vacuum freeze-drying is subjected to mixed gas heat treatment to obtain a catalyst with uniform particle size, high electrocatalytic activity and excellent thermal stability.

[0007] Beneficial effects: Through the above preparation process, this invention prepares a catalyst with strong electrocatalytic activity, high stability, and good heat resistance. The interaction mechanism between each step is as follows: Step 1: Acid treatment of porous carbon support Strong oxidizing acids (such as concentrated nitric acid and concentrated sulfuric acid) can chemically etch the surface of carbon supports under heating conditions. The negatively charged functional groups on the treated carbon surface can attract positively charged chloroplatinate ions in solution through electrostatic adsorption, providing "anchor points" for the subsequent adsorption of metal precursors and preventing the loss of metal ions in large quantities during washing or the initial stages of reduction. Improving the specific surface area utilization of the support and clearing the pores are also crucial. Enhancing the interaction between the support and the metal precursor is a prerequisite for achieving high dispersion of metal nanoparticles.

[0008] Step 2: Premixing the precursor and reducing agent The treated carbon support, chloroplatinic acid solution, and reducing agent (such as ethylene glycol or methanol) are mixed. Chloroplatinic acid ions are anchored on the carbon surface or within the pores through the functional groups generated in step (1). The reducing agent (such as alcohols) mainly acts as a dispersant and slows down the reduction. This step achieves in-situ adsorption of the metal precursor on the carbon surface, ensuring that the subsequent reduction reaction mainly occurs on the support surface, rather than homogeneous nucleation in the solution. Through impregnation and adsorption, a uniform distribution of the metal precursor at the microscale is achieved, laying the foundation for the subsequent formation of small-diameter particles.

[0009] Step 3: pH adjustment Add a mixture of NaOH (strong alkali) and reducing agent dropwise to adjust the pH to alkaline (9-12). An alkaline environment greatly enhances the reducing power of alcohols. Connecting steps (2) and (4) makes the reduction reaction more complete.

[0010] Step 4: Microwave heating and reflux reaction Microwave energy can directly act on polar molecules (such as water and ethylene glycol) and ions in solution, achieving "bulk phase heating" that is fast, uniform, and free from the hysteresis and temperature gradient of traditional heating. Under high temperature (150~250℃) and strong reducing conditions, platinum precursors adsorbed on the carbon surface are rapidly reduced to platinum atoms (Pt). 0 Due to the extremely rapid heating, the solution instantly reaches supersaturation, triggering explosive nucleation and generating a large number of crystal nuclei. Subsequently, the remaining platinum atoms grow on the crystal nuclei. By fully utilizing the anchor point of step (1) and the alkaline environment of step (3), complete reduction is achieved at high temperature (under reflux).

[0011] The uniform heating provided by microwaves avoids uneven particle size caused by localized overheating; the explosive nucleation mechanism ensures that the metal particles are small in size. Due to the numerous nucleation sites and short duration, the metal particles are firmly anchored to the carbon support, making migration and aggregation difficult.

[0012] Step 5: Cleaning and vacuum drying Repeated washing and filtration remove residual chloride ions, excess alkali, ethylene glycol oxidation products, and unreacted reducing agents, ensuring the smooth progress of step (6). If not thoroughly cleaned, residual organic matter will carbonize during subsequent high-temperature heat treatment, covering active sites; residual chloride ions at high temperatures can cause platinum grain migration and growth or catalyst poisoning.

[0013] Step 6: High-temperature mixed gas heat treatment An inert gas (such as N2 or Ar) acts as a protective gas to prevent the metal or carbon from oxidizing and burning at high temperatures. Hydrogen acts as a reducing gas to further reduce any possible oxidized platinum and remove any adsorbed organic residues on the surface. At 260–350 °C, platinum atoms gain energy to migrate and rearrange on the surface, eliminating lattice defects and increasing crystallinity. Simultaneously, it promotes moderate interaction between platinum and the functional group residues on the carbon support surface, enhancing the bonding force. This is the final shaping and reinforcement of steps (4) and (5).

[0014] Lattice reconstruction lowers the surface energy of platinum particles, making their structure more stable and less prone to dissolution or aggregation during electrochemical cycles or catalytic reactions. Complete reduction of platinum removes all remaining oxygen / chlorine-containing groups, maximizing the number of active sites. Heat treatment causes platinum particles to partially "embed" or adhere more tightly to the carbon substrate, reducing catalyst detachment.

[0015] Optionally, the strong acid used in the acid treatment in step (1) is concentrated nitric acid, concentrated sulfuric acid, or a mixture thereof.

[0016] Furthermore, the acid treatment conditions are as follows: acid treatment at 70–150°C for 0.5–5 hours.

[0017] Optionally, the mass concentration of chloroplatinic acid in the chloroplatinic acid solution in step (2) is 0.1-10% (meaning that the mass of chloroplatinic acid in 100ml of chloroplatinic acid solution is 0.1-10g).

[0018] Furthermore, the reducing agent mentioned in steps (2) and (3) is selected from at least one of ethylene glycol, methanol, or sodium borohydride.

[0019] Optionally, the ratio of sodium hydroxide to reducing agent in step (2) is 20 g: 500 mL.

[0020] Optionally, the temperature in the microwave heating reflux reaction process described in step (4) is 150-250°C, the microwave power is 500-900W, and the reaction time is 5-20 minutes.

[0021] Optionally, the mixed gas heat treatment temperature in step (6) is 260-350°C; the treatment time is 2-5 hours. The mixed gas is a mixture of an inert gas (such as nitrogen or argon) and hydrogen.

[0022] A high-temperature fuel cell catalyst is prepared by the above-described preparation method.

[0023] Optionally, the platinum particles in the high-temperature fuel cell catalyst are uniformly distributed in size between 1.5 and 1.6 nm.

[0024] Optionally, the half-wave potential of the high-temperature fuel cell catalyst is 0.85 to 0.87 V.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects: The preparation method of this invention enables the controllable preparation of platinum-carbon catalysts with platinum loadings exceeding 50%. During the synthesis process, high-power microwave heating is employed to induce explosive crystallization of platinum species, utilizing its rapid heating characteristic. This not only effectively suppresses particle agglomeration but also results in a more uniform size distribution of Pt nanoparticles, exposing a larger active surface area. Furthermore, subsequent heat treatment in a mixed atmosphere of inert gas and hydrogen effectively optimizes the interfacial structure between Pt and the carbon support, significantly improving the catalyst's durability and catalytic efficiency under high-temperature fuel cell conditions.

[0026] This invention successfully prepared a catalyst with highly uniform and dispersed platinum particles firmly anchored on a porous carbon support by optimizing key process steps such as carbon support surface modification, precursor adsorption, alkaline microwave reduction, and subsequent high-temperature mixed atmosphere heat treatment. While maintaining high metal utilization, this catalyst significantly improved the electrochemical active surface area and hydrogen evolution reaction kinetics, exhibiting excellent electrocatalytic activity with a half-wave potential of 0.85-0.87 V. Simultaneously, the high-temperature heat treatment reduced platinum lattice defects, increased crystallinity, and formed a stronger interfacial bond with the carbon support, effectively inhibiting the migration, aggregation, or detachment of platinum particles during high-temperature or electrochemical cycling, thereby greatly enhancing the catalyst's thermal stability and long-term operational durability.

[0027] In summary, the catalyst prepared by this invention has high activity, high stability and excellent heat resistance, which can meet the stringent requirements of high-temperature proton exchange membrane fuel cells for high-performance catalysts, and provides a reliable technical path for promoting the localization of core materials for domestic high-temperature fuel cells. Attached Figure Description

[0028] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 Linear voltammetric curves of the catalysts prepared in Examples 1 and 2 of this invention; Figure 2 The image shows the particle size distribution and SEM image of Pt particles in the platinum-carbon catalyst prepared in Example 1 of this invention. Figure 3 The image shows the particle size distribution and SEM image of Pt particles in the platinum-carbon catalyst prepared in Example 2 of this invention. Figure 4 Particle size distribution and SEM image of Pt particles in the platinum-carbon catalyst prepared for Comparative Example 1; Figure 5 Linear voltammetry curves of the catalyst prepared in Comparative Example 1; Figure 6 The left figure shows a schematic diagram of the size of Pt particles and the structure of the carbon support in the catalysts prepared in Examples 1 and 2, while the right figure shows a schematic diagram of the size of Pt particles and the structure of the carbon support in the catalyst prepared in Comparative Example 1. Detailed Implementation

[0029] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0030] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0031] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0032] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0033] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0034] This invention discloses a method for preparing a high-temperature fuel cell catalyst, comprising the following steps: ① Take a certain amount of strong acid and put it into a beaker containing a porous carbon support, and perform acid treatment at high temperature; ② Mix the treated porous carbon support, the prepared chloroplatinic acid solution, and a certain amount of reducing agent; ③ Add the prepared sodium hydroxide and reducing agent mixture to the mixed solution obtained in ② to adjust the pH value of the mixed solution; ④ The mixed solution obtained in ③ is placed in a microwave reactor and heated under reflux to carry out the reduction, loading and dispersion of the raw materials; ⑤ The solution after the reaction is repeatedly washed and filtered, and then dried under vacuum; ⑥ The prepared catalyst is placed in a rotary kiln and heat-treated in an inert gas and hydrogen mixed gas environment and at high temperature, and then cooled to room temperature for recovery.

[0035] The advantages of the preparation process of this invention are: 1) By using porous carbon supports, the amount of Pt used in fuel cells can be reduced, the durability of the catalyst can be improved, and the preparation cost can be reduced.

[0036] 2) Microwave synthesizer equipment is used to achieve precise control and high-efficiency preparation.

[0037] 3) The thermal stability of the catalyst is enhanced by heat treatment of the prepared catalyst using a rotary kiln.

[0038] In some alternative embodiments, the strong acid in step ① includes concentrated nitric acid, concentrated sulfuric acid, or a mixture of both.

[0039] In some alternative embodiments, the temperature range of acid treatment in step ① is 70–150 °C, and the acid treatment time is 0.5–5 h.

[0040] In some alternative embodiments, the reducing agent in step ② includes, but is not limited to, ethylene glycol, methanol, and sodium borohydride.

[0041] In some alternative embodiments, the pH of the mixed solution in step ③ is 9 to 12.

[0042] In some alternative embodiments, the temperature range for the heating reflux reaction in step ④ is 150–250 °C. In some alternative embodiments, the temperature range for the heat treatment in step ⑥ is 260–350 °C.

[0043] Unless otherwise specified, "room temperature" in this invention refers to 20-30℃.

[0044] All raw materials used in this invention were purchased from the market.

[0045] The technical solution of the present invention will be further illustrated by the following embodiments.

[0046] Example 1 A method for preparing a high-temperature fuel cell catalyst includes the following steps: Step 1: Take 40 mg of H2PtCl6 and put it into a beaker. Add 10 mL of ethylene glycol to the beaker and stir to obtain a chloroplatinic acid / ethylene glycol solution for later use. Step 2: Take a beaker and add 200 mL of ethylene glycol. Then, use a high-precision balance to weigh 20 g of NaOH, slowly add it to the beaker while stirring continuously, cool it to room temperature, and dilute it to 500 mL in a 500 mL volumetric flask (i.e., add reducing agent ethylene glycol to dilute to 500 mL, the same applies below) to obtain an alkaline solution for later use.

[0047] Step 3: Take a beaker, put in 10 g of porous carbon support, and then add 5 mL of concentrated nitric acid (analytical grade). React the beaker in a 90 ℃ oil bath for 1 h. After the reaction is complete, filter and wash the carbon support three times, then remove and dry it for later use. Step 4: Take a two-necked flask and add 5 mL of chloroplatinic acid / ethylene glycol solution, 40 mL of ethylene glycol solution (analytical grade), and 0.01 g of porous carbon support in sequence. Step 5: Add the alkaline solution prepared in Step 2 to the mixed solution in Step 4 to adjust the pH to 9; Step 6: Place the two-necked flask into a microwave synthesizer, set the power to 900 W, heat to 250 °C in 1 min, and reflux for 5 min.

[0048] Step 7: Filter the solution, then disperse the resulting solid in ultrapure water and sonicate for 5 minutes, followed by filtration. Repeat this step 3 times to ensure the catalyst sample is thoroughly cleaned.

[0049] Step 8: The obtained catalyst is freeze-dried under vacuum and then collected.

[0050] Step 9: Place the dried catalyst into a rotary furnace and heat-treat it for 3 hours at 300 °C under a mixed atmosphere of argon and hydrogen. Then, allow it to cool naturally to room temperature inside the furnace.

[0051] The catalyst prepared in Example 1 of this invention was tested by transmission electron microscopy as follows: Figure 2 As shown, the Pt particles are uniformly distributed around 1.6 nm in size, indicating that the catalyst prepared in Example 1 of this invention has good particle size and uniformity, and its half-peak potential reaches about 0.85 V (e.g., Figure 1 As shown), the Pt loading in the catalyst of Example 1 was 50.57 wt.% (measured by ICP data).

[0052] Example 2 A method for preparing a high-temperature fuel cell catalyst includes the following steps: Step 1: Take 40 mg of H2PtCl6 and put it into a beaker. Add 10 mL of methanol solution to the beaker and stir. Step 2: Take a beaker and add 200 mL of methanol. Then, use a high-precision balance to weigh 20 g of NaOH, slowly add it to the beaker while stirring continuously, cool it to room temperature, and dilute it to 500 mL in a volumetric flask to obtain an alkaline solution for later use.

[0053] Step 3: Take a beaker, put in 10 g of porous carbon support, and then add 5 mL of concentrated sulfuric acid (analytical grade). React the beaker in an oil bath at 120 ℃ for 3 h. After the reaction is complete, filter and wash the carbon support three times, then remove and dry it for later use. Step 4: Take a two-necked flask and add 5 mL of chloroplatinic acid / methanol solution, 40 mL of methanol solution (analytical grade), and 0.01 g of porous carbon support in sequence. Step 5: Add the alkaline solution prepared in Step 2 to the mixed solution in Step 4 to adjust the pH to 12; Step 6: Place the two-necked flask into a microwave synthesizer, set the power to 500 W, heat to 190 °C in 5 min, and reflux for 20 min.

[0054] Step 7: Filter the solution, then disperse the resulting solid in ultrapure water and sonicate for 5 minutes, followed by filtration. Repeat this step 3 times to ensure the catalyst sample is thoroughly cleaned.

[0055] Step 8: The obtained catalyst is freeze-dried under vacuum and then collected.

[0056] Step 9: Place the dried catalyst into a rotary furnace and heat-treat it for 3 hours at 300 °C under a mixed atmosphere of argon and hydrogen. Then, allow it to cool naturally to room temperature inside the furnace.

[0057] The catalyst prepared in Example 2 of this invention was tested by transmission electron microscopy as follows: Figure 3 As shown, the Pt particles are uniformly distributed around 1.5 nm in size, indicating that the catalyst prepared in Example 2 of this invention has good particle size and uniformity, and its half-wave potential reaches about 0.87 V (e.g., Figure 1 As shown), the Pt loading in the catalyst of Example 2 was 49.91 wt.

[0058] Comparative Example 1 A method for preparing a Pt / C catalyst for a fuel cell, differing from Example 1 in that the microwave treatment in step 6 is replaced by oil bath heating treatment, the specific steps of which are as follows: Step 1: Take 40 mg of H2PtCl6 and put it into a beaker. Add 10 mL of ethylene glycol solution to the beaker and stir. Step 2: Add 200 mL of ethylene glycol to a beaker, then weigh 20 g of NaOH using a high-precision balance, slowly add it to the beaker while stirring continuously, and cool to room temperature to obtain an alkaline solution. Make up to volume in a 500 mL volumetric flask for later use.

[0059] Step 3: Take a beaker, put in 10 g of porous carbon support, and then add 5 mL of concentrated nitric acid (analytical grade). React the beaker in a 90 ℃ oil bath for 1 h. After the reaction is complete, filter and wash the carbon support three times, then remove and dry it for later use. Step 4: Take a two-necked flask and add 5 mL of chloroplatinic acid / ethylene glycol solution, 40 mL of ethylene glycol solution (analytical grade), and 0.01 g of porous carbon support in sequence. Step 5: Add the alkaline solution prepared in Step 2 to the mixed solution in Step 4 to adjust the pH to 9; Step 6: Place the two-necked flask in an oil bath, heat to 250 °C, and reflux for 5 min.

[0060] Step 7: Filter the solution, then disperse the resulting solid in ultrapure water and sonicate for 5 minutes, followed by filtration. Repeat this step 3 times to ensure the catalyst sample is thoroughly cleaned.

[0061] Step 8: The obtained catalyst is freeze-dried under vacuum and then collected.

[0062] Step 9: Place the dried catalyst into a rotary furnace and heat-treat it for 3 hours at 300 °C under a mixed atmosphere of argon and hydrogen. Then, allow it to cool naturally to room temperature inside the furnace.

[0063] The Pt / C catalyst prepared in Comparative Example 1 of this invention was tested by transmission electron microscopy as follows: Figure 4 As shown, the Pt particles have a relatively large size (the particle size of Pt particles is uniformly distributed at 4.3 nm) and are severely aggregated, with a half-peak potential of only about 0.70 V (as shown in the image). Figure 5 As shown in the figure, the Pt loading in the catalyst of Comparative Example 1 is 22.4 wt.%.

[0064] Figure 6 The left figure shows a schematic diagram of the size of Pt particles and the carbon support structure in the catalysts prepared in Examples 1 and 2, while the right figure shows a schematic diagram of the size of Pt particles and the carbon support structure in the catalyst prepared in Comparative Example 1. Figure 6 It is evident from the data that the structure of the embodiment is superior to that of the comparative example.

[0065] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a high-temperature fuel cell catalyst, characterized in that, Includes the following steps: (1) The porous carbon support is acid-treated; (2) Mix the acid-treated carbon support, chloroplatinic acid solution and reducing agent to obtain mixed solution 1; The chloroplatinic acid solution is obtained by mixing chloroplatinic acid with a reducing agent until homogeneous; (3) Add a mixture of sodium hydroxide and reducing agent to mixed solution 1 to adjust the pH of the system to 9-12 to obtain mixed solution 2; (4) The resulting mixed solution 2 was subjected to microwave heating and reflux reaction; (5) After the reaction is complete, the product is filtered, washed and freeze-dried under vacuum; (6) The product after vacuum freeze-drying is subjected to mixed gas heat treatment to obtain a high-temperature fuel cell catalyst.

2. The method for preparing a high-temperature fuel cell catalyst according to claim 1, characterized in that, The acid used in the acid treatment in step (1) is concentrated nitric acid, concentrated sulfuric acid, or a mixture thereof.

3. The method for preparing a high-temperature fuel cell catalyst according to claim 2, characterized in that, The acid treatment conditions are: acid treatment at 70-150°C for 0.5-5 hours.

4. The method for preparing a high-temperature fuel cell catalyst according to claim 1, characterized in that, The mass concentration of chloroplatinic acid in the chloroplatinic acid solution in step (2) is 0.1-10%.

5. The method for preparing a high-temperature fuel cell catalyst according to claim 4, characterized in that, The reducing agents mentioned in steps (2) and (3) are selected from at least one of ethylene glycol, methanol, or sodium borohydride.

6. The method for preparing a high-temperature fuel cell catalyst according to claim 1, characterized in that, The ratio of sodium hydroxide to reducing agent in step (3) is 20 g: 500 mL.

7. The method for preparing a high-temperature fuel cell catalyst according to claim 1, characterized in that, The temperature during the microwave heating reflux reaction process in step (4) is 150-250°C, the microwave power is 500-900W, and the reaction time is 5-20 minutes.

8. The method for preparing a high-temperature fuel cell catalyst according to claim 1, characterized in that, The mixed gas heat treatment temperature in step (6) is 260-350℃; the treatment time is 2-5 hours. The mixed gas is a mixture of inert gas and hydrogen.

9. A high-temperature fuel cell catalyst, characterized in that, It is prepared by the preparation method described in any one of claims 1-8.

10. A high-temperature fuel cell catalyst according to claim 9, characterized in that, The platinum particles in the high-temperature fuel cell catalyst have a particle size of 1.5–1.6 nm.

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