A co-doped high-entropy perovskite cathode material, a preparation method and application thereof

Abstract

The present application relates to the technical field of solid oxide fuel cell cathode material, and particularly relates to a co-doped high-entropy perovskite cathode material, a preparation method and application thereof.The co-doped high-entropy perovskite cathode material provided by the present application has a chemical general formula of AB 3‑δ Wherein, A is Ba, Sr and Sm, B is Co, Fe and Sc, 0<=delta<3, and it is a high-entropy perovskite cathode material co-doped at A site and B site, which has a pure phase of perovskite structure, and has low thermal expansion coefficient, high oxygen reduction activity, excellent Cr and CO2 resistance, and is suitable for fuel cell field, especially solid oxide fuel cell, can obviously improve the performance of the cell, has a very wide application prospect, and has significant economic and social benefits.

Description

Technical Field

[0001] This invention relates to the field of solid oxide fuel cell cathode materials, and in particular to a co-doped high-entropy perovskite cathode material, its preparation method, and its application. Background Technology

[0002] As a power generation device not limited by the Carnot cycle, a fuel cell (FC) is an environmentally friendly power generation device that converts the chemical energy of fuel into electrical energy. Compared with conventional power generation methods, fuel cells have many advantages, including high energy conversion efficiency, low air pollutant emissions, and a wide range of fuel sources. These advantages have made fuel cells a new power generation method following conventional fossil fuel power generation, thermal power generation, hydropower generation, and nuclear energy development.

[0003] Solid oxide fuel cells (SOFCs), as a novel energy supply device, offer advantages such as high efficiency and cleanliness, enabling the conversion of chemical energy into electrical energy. SOFCs have experienced rapid development globally, with their applications expanding from power generation to refrigeration, domestic hot water supply, industrial heat supply, and energy storage. Due to their all-solid-state structure, higher energy conversion efficiency, and broad applicability to various fuel gases such as coal gas, natural gas, or mixed gases, SOFCs have attracted significant attention from researchers in related fields, leading to rapid development.

[0004] As a highly efficient energy conversion device, SOFCs' durability under actual operating conditions limits their widespread application. The cathode of SOFCs is susceptible to the effects of chromium (Cr) from the bonding material and CO2 in the air, leading to reduced battery performance and long-term stability. Simultaneously, the mismatch in the thermal expansion coefficients of the cathode and electrolyte materials causes significant interlayer stress, resulting in damage to the interface structure and electrode detachment.

[0005] Therefore, studying the influence of these factors on the cathode performance of SOFCs and their corrosion mechanism, and solving the above problems, is crucial for the application of SOFCs. Summary of the Invention

[0006] In view of this, the present invention provides a co-doped high-entropy perovskite cathode material, its preparation method and application. The co-doped high-entropy perovskite cathode material provided by the present invention has the advantages of low thermal expansion coefficient, high oxygen reduction activity and excellent resistance to Cr and CO2.

[0007] This invention provides a co-doped high-entropy perovskite cathode material with the chemical formula ABO. 3-δ Where A is Ba, Sr and Sm, B is Co, Fe and Sc, and 0 ≤ δ < 3.

[0008] Preferably, the molar ratio of Ba to Sr is 0.1~0.5:0.1~0.5; the molar ratio of Ba to Sm is 0.1~0.5:0.1~0.5; the molar ratio of Ba to Co is 0.1~0.5:0.1~0.8; the molar ratio of Co to Fe is 0.1~0.8:0.1~0.4; and the molar ratio of Co to Sc is 0.1~0.8:0.1~0.5.

[0009] This invention also provides a method for preparing the co-doped high-entropy perovskite cathode material described above, comprising the following steps: According to the element molar ratio of the general chemical formula, barium source, strontium source, samarium source, cobalt source, iron source and scandium source are mixed and then subjected to sand milling, drying and calcination in sequence to obtain the co-doped high-entropy perovskite cathode material.

[0010] Preferably, the sand milling includes the following steps: placing zirconia balls and anhydrous ethanol into a sand milling jar, assembling the sand mill, and then placing the premixed raw materials obtained by mixing into the sand mill for sand milling.

[0011] Preferably, the calcination temperature is 900~1100℃, and the holding time is 2~15 hours.

[0012] Preferably, the reaction system is heated before calcination, and the heating rate is 1~10℃ / min.

[0013] This invention also provides an application of a co-doped high-entropy perovskite cathode material in the field of solid oxide fuel cells. The co-doped high-entropy perovskite cathode material is the co-doped high-entropy perovskite cathode material described in the above-described scheme or the co-doped high-entropy perovskite cathode material obtained by the preparation method described in the above-described scheme.

[0014] Preferably, the method of application includes the following steps: mixing co-doped high-entropy perovskite cathode material with ethyl cellulose and terpineol to obtain a cathode slurry, then screen printing the cathode slurry onto the electrolyte surface and sequentially heating and calcining it to obtain a solid oxide fuel cell.

[0015] Preferably, the heating rate is 1~10℃ / min.

[0016] Preferably, the calcination temperature is 1000~1300℃, and the holding time is 2~10 hours.

[0017] Compared with the prior art, the present invention has achieved the following beneficial effects: The co-doped high-entropy perovskite cathode material provided by this invention has the general chemical formula ABO. 3-δIt is a high-entropy perovskite cathode material co-doped at A and B sites. It exhibits a pure phase of perovskite structure and has low thermal expansion coefficient, high oxygen reduction activity, and excellent resistance to Cr and CO2. It is suitable for use in fuel cell fields, especially solid oxide fuel cells, and has a very broad application prospect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of this invention, the accompanying drawings used in the embodiments of this invention or in the prior art are briefly described below. For those skilled in the art, other drawings can be derived from the following drawings without creative effort, and all such drawings are within the protection scope of this invention.

[0019] Figure 1 The image shows the XRD pattern of the co-doped high-entropy perovskite cathode material prepared in Example 1. Figure 2 The image shows the elemental distribution and microstructure of the co-doped high-entropy perovskite cathode material prepared in Example 1. Figure 3 The thermal expansion diagram is shown for the co-doped high-entropy perovskite cathode material prepared in Example 1. Figure 4 Impedance diagram of the co-doped high-entropy perovskite cathode material prepared in Example 1; Figure 5 Impedance diagrams of the co-doped high-entropy perovskite cathode material prepared in Example 1 before and after 20 hours of Cr treatment; Figure 6 Impedance diagrams of the co-doped high-entropy perovskite cathode material prepared in Example 1 before and after 20 hours of CO2 treatment; Figure 7 Impedance diagrams of the co-doped high-entropy perovskite cathode material prepared in Example 1 under CO2 atmospheres of different concentrations; Figure 8 The power density diagrams for anode-supported single cells prepared using the co-doped high-entropy perovskite cathode material of Example 1 as the cathode are shown at different temperatures. Detailed Implementation

[0020] This invention provides a co-doped high-entropy perovskite cathode material with the chemical formula ABO. 3-δ Where A is Ba, Sr and Sm, B is Co, Fe and Sc, and 0 ≤ δ < 3.

[0021] In this invention, the molar ratio of Ba to Sr is preferably 0.1~0.5:0.1~0.5, more preferably 0.2~0.4:0.2~0.4, and even more preferably 0.3:0.3.

[0022] In this invention, the molar ratio of Ba to Sm is preferably 0.1~0.5:0.1~0.5, more preferably 0.2~0.4:0.2~0.4, and even more preferably 0.3:0.3.

[0023] In this invention, the molar ratio of Ba to Co is preferably 0.1~0.5:0.1~0.8, more preferably 0.2~0.4:0.3~0.7, and even more preferably 0.3:0.5~0.6.

[0024] In this invention, the molar ratio of Co to Fe is preferably 0.1~0.8:0.1~0.4, more preferably 0.2~0.7:0.2~0.3, and even more preferably 0.4~0.6:0.2~0.3.

[0025] In this invention, the molar ratio of Co to Sc is preferably 0.1~0.8:0.1~0.5, more preferably 0.3~0.6:0.2~0.4, and even more preferably 0.4~0.5:0.3.

[0026] In this invention, δ is preferably 0.5 to 2.5, more preferably 1 to 2, and even more preferably 1.5.

[0027] This invention also provides a method for preparing the co-doped high-entropy perovskite cathode material described above, comprising the following steps: According to the element molar ratio of the general chemical formula, barium source, strontium source, samarium source, cobalt source, iron source and scandium source are mixed and sequentially subjected to sand milling, drying and calcination (referred to as the first calcination) to obtain the co-doped high-entropy perovskite cathode material.

[0028] In this invention, the purity of the barium source, strontium source, samarium source, cobalt source, iron source and scandium source is preferably 99% to 99.9%, more preferably 99.5% to 99.9%.

[0029] In this invention, the barium source preferably includes one or more of barium oxides and barium salts; the barium oxide is preferably barium oxide; and the barium salt is preferably barium carbonate.

[0030] In this invention, the strontium source preferably includes one or more of strontium oxide and strontium salt; the strontium oxide is preferably strontium oxide; and the strontium salt is preferably strontium carbonate.

[0031] In this invention, the samarium source preferably includes one or more of samarium oxide and samarium salt; the samarium oxide is preferably samarium oxide (Sm2O3); and the samarium salt is preferably samarium carbonate.

[0032] In this invention, the cobalt source preferably includes one or more of cobalt oxide and cobalt salt; the cobalt oxide is preferably one or more of cobalt tetroxide and cobalt oxide (CoO); and the cobalt salt is preferably cobalt carbonate.

[0033] In this invention, the iron source preferably includes one or more of iron oxides and iron salts; the iron oxide is preferably one or more of iron(II,III) oxide and iron(II,III) oxide (Fe2O3); and the iron salt is preferably iron carbonate.

[0034] In this invention, the scandium source preferably includes one or more of scandium oxide and scandium salt; the scandium oxide is preferably scandium oxide (Sc2O3); and the scandium salt is preferably scandium carbonate.

[0035] In this invention, the mixing is preferably performed by stirring. This invention obtains premixed raw materials through mixing.

[0036] In this invention, the sand milling preferably includes the following steps: placing zirconium oxide balls and anhydrous ethanol into a sand milling jar, assembling the sand mill, and then placing the premixed raw materials obtained by mixing into the sand mill for sand milling (referred to as the first sand milling).

[0037] In this invention, the diameter of the zirconium oxide spheres is preferably 0.05~0.3 mm, more preferably 0.1 mm.

[0038] In this invention, the mass ratio of the zirconium oxide balls to the premixed raw materials is preferably 100:10~50, more preferably 100:12.5~20.

[0039] In this invention, the mass ratio of anhydrous ethanol to premixed raw materials is preferably 310~320:10~20, more preferably 315:12.5~15.

[0040] In this invention, the rotational speed of the first mill is preferably 2700~3000 r / min, more preferably 2800~2900 r / min, and the time is preferably 30~50 minutes, more preferably 40 minutes.

[0041] In this invention, the drying temperature is preferably 60~80℃, more preferably 65~75℃, and even more preferably 70℃, and the heat preservation time is preferably 60~120min, more preferably 70~90min.

[0042] In this invention, the drying process preferably includes sieving the resulting product; the sieve mesh size is preferably 100 mesh.

[0043] In this invention, the temperature of the first calcination is preferably 900~1100℃, more preferably 950~1050℃, and even more preferably 1000℃, and the holding time is preferably 2~15 hours, more preferably 5~12 hours, and even more preferably 7 hours.

[0044] In this invention, the process of first calcination preferably includes heating the reaction system (referred to as first heating); the rate of first heating is preferably 1~10℃ / min, more preferably 3~6℃ / min.

[0045] This invention also provides an application of a co-doped high-entropy perovskite cathode material in the field of solid oxide fuel cells. The co-doped high-entropy perovskite cathode material is the co-doped high-entropy perovskite cathode material described in the above-described scheme or the co-doped high-entropy perovskite cathode material obtained by the preparation method described in the above-described scheme.

[0046] In this invention, the solid oxide fuel cell preferably includes one of a symmetrical solid oxide fuel cell and an anode-supported single cell.

[0047] In this invention, the preferred method of application includes the following steps: mixing co-doped high-entropy perovskite cathode material with ethyl cellulose and terpineol to obtain a cathode slurry, then screen printing the cathode slurry onto the electrolyte surface and sequentially heating (referred to as the second heating) and calcining (referred to as the second calcination) to obtain a solid oxide fuel cell.

[0048] In this invention, the mass ratio of ethyl cellulose to terpineol is preferably 3~6:100, more preferably 4~5:100.

[0049] In this invention, the mass ratio of the terpineol to the total mass of the co-doped high-entropy perovskite cathode material and the terpineol is preferably 70-90 wt%, more preferably 75-85 wt%, and even more preferably 80 wt%.

[0050] In this invention, the electrolyte is preferably an SDC electrolyte or an anode-supported single-cell electrolyte; the preparation method of the anode-supported single-cell electrolyte preferably includes the following steps: spin-coating an SDC electrolyte solution onto an anode support sheet followed by calcination; the concentration of SDC electrolyte in the SDC electrolyte solution is preferably 10-25 wt%, more preferably 15-20 wt%; the spin-coating amount is preferably 0.2-0.25 mL / cm². 2 The calcination temperature is preferably 1480~1520℃, more preferably 1500℃, and the holding time is preferably 1.8~2.2 hours, more preferably 2 hours.

[0051] In this invention, the coating amount of the screen printing is preferably 0.1~0.6 g / cm³. 2More preferably, it is 0.14~0.5 g / cm³. 2 Further preferred is 0.36 g / cm³ 2 .

[0052] In this invention, the heating rate of the second heating is preferably 1~10℃ / min, more preferably 3~7℃ / min, and even more preferably 5℃ / min.

[0053] In this invention, the second calcination temperature is preferably 1000~1300℃, more preferably 1000~1200℃, and the holding time is preferably 2~10 hours, more preferably 4~6 hours.

[0054] To further illustrate the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments.

[0055] Example 1: This embodiment prepares a co-doped high-entropy perovskite cathode material, and the specific steps are as follows: S1, according to Ba 0.5 Sr 0.4 Sm 0.1 Co 0.7 Fe 0.2 Sc 0.1 O 3-δ Weigh out 4.006g of barium carbonate, 2.392g of strontium carbonate, 1.416g of samarium oxide, 6.838g of cobalt oxide, 1.294g of iron oxide, and 0.560g of scandium oxide according to the stoichiometric ratio, and stir evenly to obtain a premixed raw material.

[0056] S2. Place 100g of zirconia balls (0.1mm in diameter) and 400mL of anhydrous ethanol into the sand mill jar, and assemble the sand mill.

[0057] S3. The premixed raw material obtained in S1 is put into the sand mill assembled in S2 through a funnel and sand milled at a speed of 2800 r / min for 40 min.

[0058] S4. Place the product after sand milling in S3 in an oven and dry it at 60°C for 90 minutes. Then, sieve it through a 100-mesh sieve to obtain cathode powder.

[0059] S5. The cathode powder obtained in S4 is heated at 1000℃ for 2 hours by increasing the temperature by 5℃ / min to obtain a co-doped high-entropy perovskite cathode material with the chemical formula Ba. 0.5 Sr 0.4 Sm 0.1 Co 0.7 Fe 0.2 Sc 0.1 O 3-δ .

[0060] XRD tests were performed on the co-doped high-entropy perovskite cathode material prepared in Example 1, and the results are as follows: Figure 1 As shown. According to Figure 1 It can be observed that its diffraction peaks correspond to the PDF standard card of perovskite, and no impurity peaks are present.

[0061] The microstructure of the co-doped high-entropy perovskite cathode material prepared in Example 1 was observed, and the results are as follows: Figure 2 As shown. According to Figure 2 It can be seen that the powder particles of the co-doped high-entropy perovskite cathode material are small in size, and the surface scan results show that the elements are uniformly distributed, and the lattice fringe spacing corresponds to the PDF standard card.

[0062] The thermal expansion properties of the co-doped high-entropy perovskite cathode material prepared in Example 1 were tested, and the results are as follows: Figure 3 As shown. According to Figure 3 It can be seen that the thermal expansion of co-doped high-entropy perovskite cathode materials is relatively low.

[0063] The impedance properties of the co-doped high-entropy perovskite cathode material prepared in Example 1 were tested, and the results are as follows: Figure 4 As shown. According to Figure 4 As can be seen from the electrochemical workstation, the polarization impedance (Rp) of the co-doped high-entropy perovskite cathode material prepared in Example 1 is relatively low, with Rp being 1.288 Ω·cm at 600 °C. 2 .

[0064] The impedance performance of the co-doped high-entropy perovskite cathode material prepared in Example 1 was tested in CO2 atmospheres of different concentrations. The CO2 concentration in the working environment was controlled, and the polarization impedance values ​​of the co-doped high-entropy perovskite cathode material in CO2 atmospheres of different concentrations were measured using an electrochemical workstation. The results are as follows: Figure 7 As shown. According to Figure 7 It can be seen that the co-doped high-entropy perovskite cathode material prepared in Example 1 exhibits good stability and no obvious impedance attenuation.

[0065] Example 2: This embodiment prepares a co-doped high-entropy perovskite cathode material, and the specific steps are as follows: S1, according to Ba 0.5 Sr 0.3 Sm 0.2 Co 0.6 Fe 0.2 Sc 0.2 O 3-δWeigh out 4.006g of barium carbonate, 1.798g of strontium carbonate, 2.825g of samarium oxide, 5.866g of cobalt oxide, 1.294g of iron oxide, and 1.117g of scandium oxide according to the stoichiometric ratio, stir evenly, and obtain the premixed raw materials.

[0066] S2. Place 100g of zirconia balls (0.1mm in diameter) and 400mL of anhydrous ethanol into the sand mill jar, and assemble the sand mill.

[0067] S3. The premixed raw material obtained in S1 is put into the sand mill assembled in S2 through a funnel and sand milled at a speed of 2800 r / min for 40 min.

[0068] S4. Place the product after sand milling in S3 in an oven and dry it at 60°C for 90 minutes. Then, sieve it through a 100-mesh sieve to obtain cathode powder.

[0069] S5. The cathode powder obtained in S4 is heated at 5℃ / min and calcined at 1000℃ for 2h to obtain a co-doped high-entropy perovskite cathode material.

[0070] Example 3: This embodiment prepares a co-doped high-entropy perovskite cathode material, and the specific steps are as follows: S1, according to Ba 0.5 Sr 0.2 Sm 0.3 Co 0.5 Fe 0.2 Sc 0.3 O 3-δ Weigh out 4.006g of barium carbonate, 1.196g of strontium carbonate, 4.247g of samarium oxide, 4.888g of cobalt oxide, 1.294g of iron oxide, and 1.680g of scandium oxide according to the stoichiometric ratio, stir evenly, and obtain the premixed raw materials.

[0071] S2. Place 100g of zirconia balls (0.1mm in diameter) and 400mL of anhydrous ethanol into the sand mill jar, and assemble the sand mill.

[0072] S3. The premixed raw material obtained in S1 is put into the sand mill assembled in S2 through a funnel and sand milled at a speed of 2800 r / min for 40 min.

[0073] S4. Place the product after sand milling in S3 in an oven and dry it at 60°C for 90 minutes. Then, sieve it through a 100-mesh sieve to obtain cathode powder.

[0074] S5. The cathode powder obtained in S4 is heated at 5℃ / min and calcined at 1000℃ for 2h to obtain a co-doped high-entropy perovskite cathode material.

[0075] Application Example 1: Take 0.5g of the co-doped high-entropy perovskite cathode material prepared in Example 1, add it to terpineol containing 5wt% ethyl cellulose, and grind it. The ratio of terpineol to co-doped high-entropy perovskite cathode material is 80wt%:20wt%, until a uniform cathode paste is formed. Use screen printing to uniformly coat 0.05g of the cathode paste onto an area of ​​0.14cm². 2 Ce 0.8 Sm 0.2 O 1.9 The electrolyte (SDC electrolyte) was heated to 1100℃ on both sides at a heating rate of 10℃ / min and calcined for 2 hours to obtain a symmetrical solid oxide fuel cell.

[0076] To simulate the contamination of cathode materials by chromium-containing materials, two pieces of SUS304 stainless steel (18wt% Cr) were sandwiched between the two sides of a symmetrical solid oxide fuel cell and placed in a tube furnace, where they were calcined at the test temperature (600℃) for 20 hours. The impedance values ​​before and after the 20-hour Cr treatment were measured using an electrochemical workstation, and the results are as follows: Figure 5 As shown. According to Figure 5 It can be seen that the impedance value of the co-doped high-entropy perovskite cathode material in Example 1 increased from 1.288 Ω·cm. 2 Increased to 1.871 Ω·cm 2 It exhibits excellent resistance to Cr poisoning.

[0077] To simulate CO2 contamination of the cathode material, a symmetrical solid oxide fuel cell was placed in a tubular furnace, and CO2 gas was introduced and calcined at the test temperature (600℃) for 20 hours. The impedance values ​​before and after 20 hours of CO2 treatment were measured using an electrochemical workstation. The results are as follows: Figure 6 As shown. According to Figure 6 It can be seen that the impedance value of the co-doped high-entropy perovskite cathode material in Example 1 increased from 1.288 Ω·cm. 2 Increased to 3.997 Ω·cm 2 It demonstrated good resistance to CO2 poisoning.

[0078] Application Example 2: Ce 0.8 Sm 0.2 O 1.9 NiO and graphite were mixed evenly in a mass ratio of 4:6:1, pressed into a sheet with a thickness of 13 mm, and then calcined at 1000℃ for 2 hours to obtain an anode support sheet. Then, 0.2 mL of a 20 wt% SDC electrolyte solution was spin-coated onto a 0.95 cm² area sheet. 2The anode support sheet was calcined at 1500℃ for 2 hours. 0.5g of the co-doped high-entropy perovskite cathode material prepared in Example 1 was added to terpineol containing 5wt% ethyl cellulose and ground until a uniform cathode paste was formed. 0.02g of the cathode paste was then uniformly coated onto a 0.14cm² area using screen printing. 2 After coating the anode support sheet with SDC electrolyte solution, the temperature was increased to 1100℃ at a heating rate of 10℃ / min and calcined for 2 hours to obtain an anode-supported single cell. The power density of the anode-supported single cell prepared using the co-doped high-entropy perovskite cathode material of Example 1 was tested at different temperatures, and the results are as follows: Figure 8 As shown.

[0079] according to Figure 8 As can be seen from the current-voltage curve of the anode-supported single cell measured by the electrochemical workstation, the power density of the anode-supported single cell reaches 0.78 W·cm² at an operating temperature of 700℃. -2 This demonstrates that the co-doped high-entropy perovskite cathode material provided by this invention has excellent electrochemical performance.

[0080] As can be seen from the above embodiments, the co-doped high-entropy perovskite cathode material provided by the present invention exhibits a pure phase of perovskite structure, which not only has good chemical stability, high redox activity, and low polarization resistance, but also has good compatibility with electrolytes, with very broad application prospects and significant economic and social benefits.

[0081] The embodiments of the present invention have been described above; however, these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. All other embodiments obtained by those skilled in the art based on the above embodiments of the present invention without inventive effort are within the protection scope of the present invention.

Claims

1. A co-doped high-entropy perovskite cathode material, characterized in that, The general chemical formula is ABO 3-δ Where A is Ba, Sr and Sm, B is Co, Fe and Sc, and 0 ≤ δ < 3.

2. The co-doped high-entropy perovskite cathode material according to claim 1, characterized in that, The molar ratio of Ba to Sr is 0.1~0.5:0.1~0.5; The molar ratio of Ba to Sm is 0.1~0.5:0.1~0.5; The molar ratio of Ba to Co is 0.1~0.5:0.1~0.8; The molar ratio of Co to Fe is 0.1~0.8:0.1~0.4; The molar ratio of Co to Sc is 0.1~0.8:0.1~0.

5.

3. A method for preparing a co-doped high-entropy perovskite cathode material, characterized in that, The co-doped high-entropy perovskite cathode material is the co-doped high-entropy perovskite cathode material according to any one of claims 1 to 2, and includes the following steps: According to the element molar ratio of the general chemical formula, barium source, strontium source, samarium source, cobalt source, iron source and scandium source are mixed and then subjected to sand milling, drying and calcination in sequence to obtain the co-doped high-entropy perovskite cathode material.

4. The method for preparing the co-doped high-entropy perovskite cathode material according to claim 3, characterized in that, The grinding process includes the following steps: Zirconia balls and anhydrous ethanol are placed into a sand mill jar, and the sand mill is assembled. Then, the premixed raw materials are placed into the sand mill for sand milling.

5. The method for preparing the co-doped high-entropy perovskite cathode material according to claim 3, characterized in that, The calcination temperature is 900~1100℃, and the holding time is 2~15 hours.

6. The method for preparing the co-doped high-entropy perovskite cathode material according to claim 3, characterized in that, The process before calcination also includes heating the reaction system at a rate of 1~10℃ / min.

7. The application of a co-doped high-entropy perovskite cathode material in the field of solid oxide fuel cells, characterized in that, The co-doped high-entropy perovskite cathode material is the co-doped high-entropy perovskite cathode material according to any one of claims 1 to 2 or the co-doped high-entropy perovskite cathode material obtained by the preparation method according to any one of claims 3 to 6.

8. The application according to claim 7, characterized in that, The method of application includes the following steps: A cathode slurry is prepared by mixing co-doped high-entropy perovskite cathode material with ethyl cellulose and terpineol. The cathode slurry is then screen-printed onto the surface of the electrolyte and subsequently heated and calcined to obtain a solid oxide fuel cell.

9. The application according to claim 8, characterized in that, The heating rate is 1~10℃ / min.

10. The application according to claim 8, characterized in that, The calcination temperature is 1000~1300℃, and the holding time is 2~10 hours.

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