In-situ modified fe nanoparticle supported oxygen ion conductor fuel electrode, method of making and use

Abstract

This invention relates to an in-situ modified Fe nanoparticle-supported oxygen ion conductor fuel electrode, its preparation method, and its applications, belonging to the field of fuel cell technology. This invention proposes a dual perovskite oxide Sr2Fe... 1.5 Mo 0.5 O 6‑δ The B-site Zn substitution strategy revealed that Zn doping can significantly enhance the Fe-O bond energy in the material and reduce the Sr2Fe bond energy. 1.5 Mo 0.5 O 6‑δ The precipitation energy of Fe element is reduced, thereby inhibiting the precipitation of Fe nanoparticles under high-temperature reducing atmosphere, achieving the purpose of in-situ modification of Fe nanoparticles. Tests on three fuel electrode materials with different doping amounts revealed that the Zn-doped material exhibited superior CO2 electrolysis performance. The optimized nanoparticles not only provided more reaction sites but also enhanced the material's chemisorption capacity for CO2, which is beneficial to the carbon dioxide reduction reaction process.

Description

Technical Field

[0001] This invention relates to a method for preparing and applying a high-performance solid oxide fuel electrode, belonging to the field of new energy materials technology. Background Technology

[0002] Solid oxide electrolytic cells (SOECs) possess excellent conversion efficiency, exhibiting good thermodynamics and kinetics even at relatively high operating temperatures (600-850℃). They can directly electrochemically convert CO2 to CO with a Faraday efficiency (FE) approaching 100%, thus showing broad development prospects in CO2 elimination and efficient utilization. This is because CO2 undergoes electrochemical reduction at the SOEC cathode side to produce CO and O. 2- Therefore, most current research on SOEC focuses on optimizing the cathode material for the carbon dioxide reduction reaction (CO2RR) process. The most common cathode materials are metals and perovskite oxides. While metal-based materials such as Ni-YSZ and Ni-GDC exhibit CO2RR activity, severe carbon deposition, Ni particle agglomeration, and oxidation significantly limit their application in SOEC. Unlike metal-based materials, perovskite oxides, due to their excellent anti-coking ability, outstanding redox stability, and sufficient ionic and electronic conductivity, have gradually become a research hotspot for SOEC cathode materials.

[0003] However, relatively poor catalytic activity is a major problem currently facing perovskite materials. Methods such as impregnation, doping, and in-situ precipitation are commonly used to improve the electrocatalytic activity of these materials. Compared to impregnation, in-situ precipitation results in better dispersion of nanoparticles, and the interaction between the nanoparticles and the support makes them more stable, thus mitigating or preventing performance degradation of the electrolytic cell during operation to some extent. Current research typically involves incorporating a certain amount of easily reducible transition metal elements at the B-site of the material to promote the precipitation process. (La) 0.75 Sr 0.25 ) 0.9 Cr 0.5 Mn 0.5 O 3-δ (LSCM) and Sr2Fe 1.5 Mo 0.5 O 6-δ (SFM) exhibits excellent stability under reducing atmospheres and is therefore commonly used as a parent material for in-situ precipitated perovskite oxides. Xie et al. reported (La) 0.75 Sr 0.25 ) 0.9 (Cr 0.5 Mn 0.5 ) 0.9 Ni 0.1 O 3-δThe precipitation of metallic Ni in Sr nanoparticles exhibits good catalytic activity and redox stability, effectively improving the current density and Faraday efficiency of CO2 electrolysis (non-patent literature 1). Xia et al. also reported the precipitation of Ni-Fe alloys in Sr... 1.9 Fe 1.5 Mo 0.4 Ni 0.1 O 6-δ The precipitation phenomenon was observed, with a current density reaching 2.16 A cm⁻¹ at 800℃ and 1.5V. -2 (Non-patent literature 2)

[0004] Although cathodes prepared by in-situ deposition show significant improvements in reactivity and dispersion compared to traditional cathode materials, the size and stability of nanoparticles deposited under a reducing atmosphere still present certain challenges. During long-term operation in high-temperature CO2 electrolysis, the perovskite structure is inevitably destroyed by the reducing atmosphere, resulting in poor thermal stability and nanoparticle growth and aggregation. This reduces the electrode's electron and ion transport capacity and CO2 catalytic reduction ability, leading to a sharp decline in electrolysis performance. Therefore, a simple and efficient method is urgently needed to modify, optimize, and stabilize the deposited nanoparticles.

[0005] Non-patent document 1: Ruan C,

[0006] Non-patent literature 2: Li Y, Hu B, Xia C, et al. A novel fuel electrode enabling direct CO2 electrolysis with excellent and stable cell performance [J]. Journal of Materials Chemistry A. 2017, 5: 20833-20842. (10.1039 / C7TA05750D). Summary of the Invention

[0007] The purpose of this invention is to: Sr2Fe 1.5 Mo 0.5 O 6-δThe high degree of Fe precipitation under high-temperature reduction conditions leads to low catalytic activity and decreased operational stability in the material. The improvement of this invention lies in the preparation of a solid oxide fuel electrode material with Sr₂Fe₂O₃ content. 1.5-x Zn x Mo 0.5 O 6-δ The general formula (x = 0.05-0.25) is used in this method to enhance the Fe-O bond energy in the material by Zn doping, thereby reducing the Sr2Fe bond energy. 1.5 Mo 0.5 O 6-δ The precipitation energy of Fe is reduced, thereby inhibiting the precipitation of Fe nanoparticles under high-temperature reducing atmospheres, achieving in-situ modification of Fe nanoparticles. This optimizes the microstructure of the precipitated nanoparticles and improves the CO2 chemisorption capacity and catalytic activity stability of the solid oxide fuel cell material. The material obtained by high-temperature solid-state calcination exhibits a highly uniform elemental distribution at the nanoscale and retains excellent porosity. Since Zn doping can suppress the precipitation of Fe nanoparticles under high-temperature reducing atmospheres, in-situ modification of Fe nanoparticles significantly improves the material's stability and increases the number of active sites, thereby enhancing the CO2RR activity. This results in excellent electrochemical performance in solid oxide electrolyzers while improving the durability of the electrolyzer under harsh operating conditions.

[0008] A solid oxide fuel electrode material with the general chemical formula A₂B₂O 6-δ The specific molecular formula is: Sr2Fe 1.5- x Zn x Mo 0.5 O 6-δ , where δ is the content of oxygen vacancies, x = 0.05-0.25, preferably 0.1-0.2.

[0009] The molecular formula is: Sr2Fe 1.4 Zn 0.1 Mo 0.5 O 6-δ (SFZM01).

[0010] The preparation method of the above-mentioned solid oxide fuel electrode material refers to the high-temperature solid-phase calcination method.

[0011] The high-temperature solid-state calcination method includes the following steps: weighing a certain amount of strontium carbonate, iron oxide, zinc oxide, and molybdenum oxide powder according to the stoichiometric ratio, mixing them, ball milling, and calcining to obtain the final product.

[0012] Ethanol is used as a grinding aid in the ball milling process, with a rotation speed of 200-600 rpm.

[0013] The calcination process is carried out at a temperature of 1050-1250℃, for a calcination time of 4-10 hours, with a heating rate of 2-8℃ / min.

[0014] The above-mentioned solid oxide fuel electrode materials are used in solid oxide electrolytic cells.

[0015] The application described is as a fuel electrode.

[0016] The aforementioned uses are to improve the CO2 adsorption capacity of electrode materials, enhance CO2RR activity, current output performance, and improve battery durability.

[0017] The electrolyte used in the solid oxide electrolytic cell is La. 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ (LSGM).

[0018] Beneficial effects

[0019] (1) The synthesis method is simple and efficient.

[0020] This invention synthesizes Sr2Fe via high-temperature solid-state calcination. 1.5-x Zn x Mo 0.5 O 6-δ (x = 0, 0.1, 0.2) Electrode material, the elements in the material are uniformly distributed, and the synthesis method is simple and efficient.

[0021] (2) Excellent performance

[0022] Sr2Fe 1.4 Zn 0.1 Mo 0.5 O 6-δ (SFZM01) is an excellent fuel electrode material, exhibiting a current density of -2220 mA cm⁻¹ at 850℃ and 1.6V in electrolytic cell mode. -2 .

[0023] (3) The electrolytic cell has outstanding stability

[0024] With Sr2Fe 1.4 Zn 0.1 Mo 0.5 O 6-δ SFZM01, as an excellent fuel electrode material, was used in a single cell of SFZM01|LSGM|BSCF at 800℃ and 1.4 A cm⁻¹ in electrolytic cell mode. -2 It can operate stably for 150 hours under a high voltage of 1.8V. Attached Figure Description

[0025] Figure 1 These are the XRD patterns of SFM, SFZM01, and SFZM02 electrode materials at room temperature;

[0026] Figure 2 The XRD patterns of SFM, SFZM01 and SFZM02 electrode materials after reduction at 800℃ and in a 10% H2 / N2 atmosphere for 2 hours are shown.

[0027] Figure 3 The images are SEM images of SFM, SFZM01 and SFZM02 electrode materials after reduction at 800℃ for 2 hours in a 10% H2 / N2 atmosphere.

[0028] Figure 4 These are high-magnification TEM images and corresponding mapping images of the SFM, SFZM01, and SFZM02 electrode materials.

[0029] Figure 5 The images show high-magnification TEM images and corresponding mapping images of SFM, SFZM01, and SFZM02 electrode materials after reduction at 800℃ in a 10% H2 / N2 atmosphere for 2 hours.

[0030] Figure 6 It is the oxygen temperature-programmed desorption of SFM, SFZM01 and SFZM02 electrode materials;

[0031] Figure 7 These are the O1s XPS spectra of SFM, SFZM01, and SFZM02;

[0032] Figure 8 This is a schematic diagram of the TG for SFM, SFZM01, and SFZM02;

[0033] Figure 9 It is the CO2 programmable desorption of SFM, SFZM01 and SFZM02;

[0034] Figure 10 These are the infrared spectra of SFM, SFZM01, and SFZM02;

[0035] Figure 11 The images show the ASR comparison of SFM, SFZM01 and SFZM02 samples on symmetric cells at 850℃ and 50% CO-CO2 atmosphere, along with the corresponding DRT treatments.

[0036] Figure 12 These are the IV curves of the SFZM01|LSGM|BSGF electrolytic cell in electrolytic cell mode within a temperature range of 750-850℃;

[0037] Figure 13This is a comparison chart of the electrolytic performance of SFM, SFZM01, and SFZM02 within the temperature range of 750-850℃;

[0038] Figure 14 The Faraday efficiency of CO2 electrolysis by the SFZM01 fuel electrode at different current densities at 850℃ is shown.

[0039] Figure 15 At 850℃, the SFZM01 electrode achieves a current of -1400mA cm⁻¹. -2 Durability test under constant current density and pure CO2 atmosphere. Detailed Implementation

[0040] This invention provides a solid oxide electrolyzer fuel electrode material, Sr2Fe, with excellent electrochemical performance. 1.5-x Zn x Mo 0.5 O 6-δ The preparation method and application of (x=0.05-0.25), where δ represents the oxygen vacancy content, belong to the field of solid oxide electrolytic cell fuel electrode materials. Sr2Fe prepared by high-temperature solid-phase combustion method. 1.5-x Zn x Mo 0.5 O 6-δ The nanomaterials for fuel electrodes exhibit uniform elemental distribution. Zn doping suppresses Fe nanoparticle precipitation during subsequent reduction treatment, in-situ optimizing the size and number of precipitated nanoparticles per unit area. This expands the reactive sites to some extent, enhancing the material's chemisorption capacity for CO2, improving its CO2RR activity, current output in solid oxide electrolysis cell operation mode, and long-term operational stability. In electrolysis cell mode, Sr₂Fe 1.4 Zn 0.1 Mo 0.5 O 6-δ The (SFZM01) fuel electrode exhibits a current density of -2220 mA cm⁻¹ at 850℃ and 1.6V. -2 It operated stably at a high voltage of 1.8V for 150 hours, maintaining a current density of 1.4A cm⁻¹. -2 This invention develops a high-performance solid oxide fuel electrode material and its preparation method, which greatly improves the electrochemical performance and long-term stability of solid oxide electrolyzers.

[0041] The three materials used in the following examples have the following molecular composition: Sr2Fe 1.5 Mo 0.5 O 6-δ (SFM), Sr2Fe 1.4 Zn 0.1 Mo0.5 O 6-δ (SFZM01) and Sr2Fe 1.3 Zn 0.2 Mo 0.5 O 6-δ (SFZM02) is prepared by high-temperature solid-phase combustion.

[0042] Example 1

[0043] This embodiment provides a solid oxide electrolyzer fuel electrode material, using Sr2Fe. 1.4 Zn 0.1 Mo 0.5 O 6-δ Taking the preparation method of (SFZM01) as an example, the specific steps are as follows:

[0044] (1) Weigh out the chemically measured amounts of high-purity strontium carbonate, iron oxide, zinc oxide, and molybdenum oxide powder and put them into an agate jar. Add ethanol as a grinding aid and ball mill at 400 rpm.

[0045] (2) Dry the electrode material, pulverize it and calcine it at 1200°C for 10 hours to obtain the required powder.

[0046] Example 2

[0047] This embodiment provides a solid oxide electrolyzer fuel electrode material, using Sr2Fe. 1.3 Zn 0.2 Mo 0.5 O 6-δ Taking the preparation method of (SFZM02) as an example, the specific steps are as follows:

[0048] (1) Weigh out the chemically measured amounts of high-purity strontium carbonate, iron oxide, zinc oxide, and molybdenum oxide powder and put them into an agate jar. Add ethanol as a grinding aid and ball mill at 400 rpm.

[0049] (2) Dry the electrode material, pulverize it and calcine it at 1200°C for 10 hours to obtain the required powder.

[0050] Comparative Example 1

[0051] This embodiment provides a solid oxide electrolyzer fuel electrode material, using Sr2Fe. 1.5 Mo 0.5 O 6-δ Taking the preparation method of (SFM) as an example, the specific steps are as follows:

[0052] (1) Weigh out the chemically measured amounts of high-purity strontium carbonate, iron oxide, and molybdenum oxide powder and put them into an agate jar. Add ethanol as a grinding aid and ball mill at 400 rpm.

[0053] (2) Dry the electrode material, pulverize it and calcine it at 1200°C for 10 hours to obtain the required powder.

[0054] Preparation and testing of symmetric cells

[0055] With Sr2Fe 1.4 Zn 0.1 Mo 0.5 O 6-δ The preparation and testing method of the symmetrical cell with electrode (SFZM01) is as follows:

[0056] (1) Weigh 1g of the electrode powder Sr2Fe obtained in Example 1 1.4 Zn 0.1 Mo 0.5 O 6-δ (SFZM01) was placed in a high-energy spherical ink jar, and 10 mL of isopropanol, 2 mL of ethylene glycol and 0.8 mL of glycerol were added. The mixture was ball-milled at 400 r / min for 30 min to obtain the desired electrode slurry.

[0057] (2) The prepared LSGM electrolyte sheet was placed on a heating stage at 150°C. The prepared electrode slurry was uniformly sprayed onto both sides of the electrolyte sheet using an inert gas and a spray gun. After the liquid had completely evaporated, the sprayed electrolyte sheet was placed in a high-temperature furnace at 1000°C and calcined for 2 hours to obtain the desired LSGM electrolyte-supported symmetrical cell. This cell was then used to test the electrode polarization impedance within a temperature range of 700-850°C. The polarization impedance of the symmetrical cell measured at 850°C under a 50% CO-CO2 atmosphere was 0.23 Ωcm. 2 .

[0058] Preparation and testing of single cells

[0059] With Sr2Fe 1.4 Zn 0.1 Mo 0.5 O 6-δ (SFZM01) describes the preparation and testing method for a single cell with a fuel electrode. The specific steps are as follows:

[0060] (1) Weigh 1g of the electrode powder Sr2Fe obtained in Example 1 1.4 Zn 0.1 Mo 0.5 O 6-δ (SFZM01) was placed in a high-energy spherical ink jar, and 10 mL of isopropanol, 2 mL of ethylene glycol and 0.8 mL of glycerol were added. The mixture was ball-milled at 400 r / min for 30 min to obtain the desired electrode slurry.

[0061] (2) The prepared BSCF-LSGM half-cell was placed on a heating stage at 150°C. The prepared electrode slurry was uniformly sprayed onto the electrolyte side surface using an inert gas and a spray gun. After the liquid completely evaporated, the sprayed electrolyte sheet was placed in a high-temperature furnace at 1000°C for 2 hours to obtain the desired LSGM electrolyte-supported single cell. This cell was then used to test the electrolytic cell performance within a temperature range of 750-850°C. The current density measured at 850°C and 1.6V was -2220 mA cm⁻¹. -2 .

[0062] Characterization results

[0063] 1. X-ray diffraction (XRD) characterization

[0064] Figure 1 These are the XRD patterns of three battery powders, SFM, SFZM01, and SFZM02, at room temperature. All three samples exhibit typical diffraction peaks of perovskite oxides (PDF#96-153-1826), with no other impurity peaks. All diffraction peaks are sharp, indicating a high degree of crystallinity in the powders.

[0065] Figure 2 The images show the XRD patterns of three battery powders, SFM, SFZM01, and SFZM02, after reduction at 800℃ in a 10% H2 / N2 atmosphere for 2 hours. All three powders underwent a phase transition after reduction, exhibiting a structure changing from a double perovskite to a Ruddlesden Popper structure (Sr3FeMoO). 6.5 The phase transition of (PDF#0-052-1715) occurred, and Fe metal (PDF#96-110-109) nanoparticles were precipitated.

[0066] 2. Characterization by scanning electron microscopy (SEM)

[0067] Figure 3 These are SEM images of three electrode materials, SFM, SFZM01, and SFZM02, after reduction at 800℃ in a 10% H2 / N2 atmosphere for 2 hours. The SEM images clearly show that the three electrode powders retain their porous structure after reduction treatment, without sintering, and the powder surface is loaded with clear and uniform nanoparticles. From the SEM images of the three materials, it is clear that under the same reduction conditions, the nanoparticles precipitated on the surface of SFM have the largest particle size, while the particle size of the nanoparticles precipitated on the surfaces of SFZM01 and SFZM02 decreases with increasing Zn content.

[0068] 3. Transmission electron microscopy (TEM) characterization

[0069] Figure 4The images show a high-magnification TEM image of SFZM01 and its corresponding mapping. The interplanar spacing of the SFZM01 powder is 0.277 nm, corresponding to the (100) crystal plane of SFZM01. The TEM-mapping results also indicate that the elements in the SFZM01 powder are uniformly distributed within the material.

[0070] Figure 5 These are high-magnification TEM images and corresponding mapping images of the SFZM0 electrode material after reduction at 800℃ in a 10% H2 / N2 atmosphere for 2 hours. The TEM-mapping results show that only Fe nanoparticles precipitated during the reduction process, while Sr, Zn, Mo, and other elements remained uniformly dispersed within the material. The high-magnification TEM lattice diffraction pattern confirms the presence of precipitated FeO. x The interplanar spacing is 0.267 nm, corresponding to the (107) crystal plane.

[0071] 4. Characterization of Oxygen-Programmed Temperature Desorption (O2-TPD)

[0072] Figure 6 The O2 desorption was measured using a temperature-programmed method for SFM, SFZM01, and SFZM02 electrode materials. The peak desorption temperature of oxygen for all three materials was around 420℃. Since the sample quality was kept consistent during the testing process, the semi-quantitative O2 desorption peak area indicates that the Zn-doped SFZM01 and SFZM02 materials have more oxygen vacancies at high temperatures. This suggests that Zn doping can optimize oxygen surface diffusion and oxygen phase transport capabilities at high temperatures.

[0073] 5. X-ray photoelectron spectroscopy (XPS) characterization

[0074] Figure 7 These are XPS spectra of O1s in SFM, SFZM01, and SFZM02 electrode materials; the lattice oxygen (O) of SFZM01. lattice ) and adsorbed oxygen (O adsorb The contents of O were 34.96% and 65.04% respectively, while the contents of O in samples SFZM01 and SFZM02 were... adsorb / O lattice The values ​​were 1.86 and 1.90, respectively, which were higher than SFM (1.54), indicating that Zn doping can effectively increase oxygen vacancies on the material surface.

[0075] 6. Thermogravimetric analysis (TGA) characterization

[0076] Figure 8This is a schematic diagram of the TG values ​​for the SFM, SFZM01, and SFZM02 electrode materials; the mass changes of the three samples from room temperature to 1000℃ are observed. The weight losses of the three materials, SFM, SFZM01, and SFZM02, are 0.76%, 0.82%, and 0.86%, respectively, indicating that the two Zn-doped materials have more oxygen vacancies.

[0077] 7. Characterization of CO2 temperature-programmed desorption (CO2-TPD)

[0078] Figure 9 This is a schematic diagram of CO2-TPD for the SFM, SFZM01, and SFZM02 electrode materials. The peak CO2 desorption temperatures of the three materials are 651.7℃, 676.2℃, and 638.6℃, respectively. CO2 desorption above 300℃ is due to the chemisorption of CO2 by the materials. SFZM01 has the highest desorption temperature, which is closer to the operating temperature of an actual electrolytic cell. Furthermore, the peak area of ​​the CO2 desorption curve indicates that SFZM01 has the highest chemisorption capacity for CO2, which is beneficial for improving the CO2 RR process.

[0079] 8. Infrared (IR) Spectroscopic Characterization

[0080] Figure 10 These are the infrared spectra of SFM, SFZM01, and SFZM02 electrode materials after CO2 adsorption treatment. The spectra are in the range of 1500-1430 cm⁻¹. -1 A distinct peak appears at this point, and this peak usually corresponds to... The presence of [something]. Under the same adsorption treatment conditions, the peaks of SFZM01 and SFZM02 were more pronounced than those of SFM, indicating that SFZM01 and SFZM02 materials are more likely to generate carbonate and active carbonate intermediates under CO2 atmosphere, thus promoting the CO2RR process.

[0081] 9. Electrochemical impedance spectroscopy

[0082] Figure 11 The figures show a comparison of the ASR values ​​of SFM, SFZM01, and SFZM02 samples obtained on symmetric cells at 850℃ and a 50% CO-CO2 atmosphere, along with their corresponding DRT treatments. Under a 50% CO-CO2 atmosphere, the ASR values ​​of SFM, SFZM01, and SFZM02 at 850℃ are 0.37, 0.23, and 0.32 Ωcm, respectively. 2 Among them, SFZM01 has the lowest ASR, which is reduced by about 37.8% compared to SFM material. From the corresponding DRT results, the incorporation of Zn can significantly reduce the peak intensity in the low frequency region, indicating that the surface reaction process of SFZM01 is greatly promoted, making it an excellent candidate material for fuel electrode in solid oxide electrolyzers.

[0083] 10. Electrolytic Cell Performance Testing

[0084] Figure 12 The SFZM01|LSGM|BSGF electrolyzer, supported by LSGM electrolyte, was first tested at 80 mL / min. -1 Heating to 850℃ under H2 atmosphere, and after the temperature stabilizes, switching to 40mL / min -1 Under a pure CO2 atmosphere, and using a cooling test sequence with a step size of 50℃, IV curves were obtained in electrolytic cell mode within the temperature range of 750-850℃; the SFZM01 electrolytic cell was tested at 40mL / min. -1 Under a pure CO2 atmosphere, the current densities at 750, 800, and 850 °C are -680, -1573, and -2220 mA / cm², respectively. -2 (1.6V).

[0085] Figure 13 This chart compares the electrolytic performance of three electrolytic cells using SFM, SFZM01, and SFZM02 electrodes, respectively, under the same heating conditions and testing methods, within a temperature range of 750-850℃. Under the same atmosphere at 850℃, the current densities of SFM, SFZM01, and SFZM02 are -1420, -2220, and -1620 mA / cm², respectively. -2 (1.6V); It can be seen that the current output of the SFZM01 electrode material is at its maximum value at three temperature points of 750, 800 and 850℃. Even the SFZM02 material is better than the SFM material.

[0086] Figure 14 This study examines the CO production and Faradaic efficiency of the SFZM01 fuel electrode at 850℃ under different current densities during CO2 electrolysis. The results show the efficiency of the SFZM01 electrode at 850℃ and at current densities of 0.4, 0.6, 0.8, 1.0, 1.2, and 1.4 A cm⁻¹. -2 The CO production rates measured under the specified conditions were 2.45, 3.85, 5.23, 6.93, 7.53, and 9.63 mL / cm². -2 min -1 The SFZM01 fuel electrode exhibits a Faraday efficiency close to 100% when electrolyzing CO2 at different current densities, indicating that the SFZM01 electrode possesses excellent CO2RR activity and electrochemical reaction rate.

[0087] 13. Electrolytic Cell Durability Test

[0088] Figure 15 At 850℃, the SFZM01 electrode achieves a current of -1400mA cm⁻¹. -2Durability tests were conducted under constant current density and pure CO2 atmosphere; the short-term durability of the SFZM01 electrolytic cell under high voltage conditions was observed. During the 150-hour test, the voltage of the electrolytic cell remained stable at 1.8V, indicating good durability.

Claims

1. The application of a solid oxide fuel electrode material in a solid oxide electrolytic cell, wherein the solid oxide fuel electrode material electrochemically converts CO2 to CO in the electrolytic cell, and the general chemical formula of the solid oxide fuel electrode material is A2B2O. 6-δ Its characteristics are, The solid oxide fuel electrode material has a molecular formula of: Sr2Fe 1.5-x Zn x Mo 0.5 O 6-δ wherein δ is the content of oxygen vacancies and x = 0.1-0.

2.

2. The use according to claim 1, characterized in that, Molecular formula: Sr2Fe 1.4 Zn 0.1 Mo 0.5 O 6-δ .

3. The use as described in claim 1, characterized in that, The preparation method for solid oxide fuel electrode materials is high-temperature solid-phase calcination.

4. The use according to claim 3, characterized in that, The process includes the following steps: Weigh a certain amount of strontium carbonate, iron oxide, zinc oxide, and molybdenum oxide powder according to the stoichiometric ratio, mix them, ball mill them, and then calcine them to obtain the final product.

5. The use according to claim 4, characterized in that, The ball milling process uses ethanol as a grinding aid and a rotation speed of 200-600 rpm.

6. The use according to claim 4, characterized in that, The temperature of the calcination process is 1050-1250 0 C, the calcination time is 4-10 h, and the temperature rising speed is 2-8 0 C / min.

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