LU601413B1 - A cathode material for intermediate and low temperature solid oxide fuel cells and its preparation method - Google Patents
A cathode material for intermediate and low temperature solid oxide fuel cells and its preparation methodInfo
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- LU601413B1 LU601413B1 LU601413A LU601413A LU601413B1 LU 601413 B1 LU601413 B1 LU 601413B1 LU 601413 A LU601413 A LU 601413A LU 601413 A LU601413 A LU 601413A LU 601413 B1 LU601413 B1 LU 601413B1
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- cathode material
- solid oxide
- oxide fuel
- low temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9016—Oxides, hydroxides or oxygenated metallic salts
- H01M4/9025—Oxides specially used in fuel cell operating at high temperature, e.g. SOFC
- H01M4/9033—Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites
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- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G51/00—Compounds of cobalt
- C01G51/40—Complex oxides containing cobalt and at least one other metal element
- C01G51/66—Complex oxides containing cobalt and at least one other metal element containing alkaline earth metals, e.g. SrCoO3
- C01G51/68—Complex oxides containing cobalt and at least one other metal element containing alkaline earth metals, e.g. SrCoO3 containing rare earths, e.g. (La0.3Sr0.7)CoO3
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- C01P2002/30—Three-dimensional structures
- C01P2002/34—Three-dimensional structures perovskite-type (ABO3)
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- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01P2006/40—Electric properties
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Abstract
The present invention provides a cathode material for intermediate and low temperature solid oxide fuel cells, with the general formula Sr1-xRxCoO3-δ, wherein: 0.01 ≤ x ≤ 1.0, 0 ≤ δ ≤ 0.5, and R is Pr, Y, Nd, Dy, or Gd. The present invention also provides a preparation method for the intermediate and low temperature solid oxide fuel cell cathode material. By using a dual-chelating sol-gel technique, a cathode material with uniform particles is prepared. The perovskite structure of SrCoO3-δ is stabilized, and it exhibits high conductivity in air, good catalytic activity in the temperature range of 500–800 °C, good compatibility with electrolytes LSGM and SDC, and demonstrates good stability and electrochemical performance within the intermediate and low temperature range.
Description
DESCRIPTION LU601413
A CATHODE MATERIAL FOR INTERMEDIATE AND LOW TEMPERATURE
SOLID OXIDE FUEL CELLS AND ITS PREPARATION METHOD
The present invention relates to the technical field of solid oxide fuel cells, and more particularly to a cathode material for intermediate and low temperature solid oxide fuel cells and its preparation method.
With the excessive exploitation of fossil energy and the worsening environmental pollution, the sustainable development of the socio-economy has been severely restricted, making the development of clean and efficient new energy sources imperative. Solid oxide fuel cells, as a new type of safe, clean, and efficient energy conversion device, have increasingly attracted widespread attention. Traditional solid oxide fuel cells typically operate at high temperatures (800-1000°C), which leads to problems such as poor stability, short lifespan, and high operating costs. Lowering the operating temperature is beneficial for broadening the selection range of cell materials and contact materials and reducing operating costs. Therefore, reducing the operating temperature to the intermediate and low temperature range (500-800°C) has become one of the hotspots in solid oxide fuel cell research. However, the reduction in operating temperature leads to decreased catalytic activity of electrode materials and increased polarization impedance, which seriously affects the performance output of solid oxide fuel cells. Therefore, it is very important to search for and develop cathode materials for solid oxide fuel cells that have good catalytic activity and stable electrode performance under intermediate and low temperature conditions.
SUMMARY LU601413
The purpose of the present invention is to overcome the problem of structural instability of the perovskite oxide cathode material of the solid oxide fuel cell in the prior art during operation, and to provide a medium- and low-temperature solid oxide fuel cell cathode material and a preparation method thereof. The perovskite structure of the battery cathode material is stable and has good performance.
This invention provides a cathode material for intermediate and low temperature solid oxide fuel cells, characterized in that its composition has the general formula
Sr1-xRxCoO3-5, wherein: 0.01 =x < 1.0, 0<5=<= 0.5, and Ris Pr, Y, Nd, Dy, or Gd.
This invention also provides a preparation method of the cathode material for intermediate and low temperature solid oxide fuel cells according to claim 1, characterized in that it specifically comprises the following steps: step 1: according to the chemical formula of the cathode material, nitrates of element Sr, element R, and element
Co are weighed separately in stoichiometric proportions, wherein R is Pr, Y, Nd, Dy, or
Gd; Step 2: the materials weighed in Step 1 are dissolved in deionized water and mixed evenly, then ethylenediaminetetraacetic acid and citric acid are added as dual chelating agents, ammonia water is added, stirred until uniform and transparent to obtain a mixed solution; Step 3: the mixed solution obtained in Step 2 is adjusted to pH 8, and heated under conditions of 90°C—140°C, stirred and evaporated to remove moisture and concentrated into dry gel; Step 4: the dry gel obtained in Step 3 is evenly dried to obtain a black precursor material; Step 5: The precursor material obtained in Step 4 is calcined, then ground and sintered to obtain the cathode material Sr1-xRxCoO3-5 powder.
Preferably, in Step 2, the molar ratio of EDTA:metal ions:citric acid in the mixed solution is 2:1:1.
Preferably, in Step 3, the heating and concentrating specifically comprises: adjusting the solution pH to 8, first heating at 90°C—100°C, stirring and evaporating to remove water until it becomes a viscous gel, then continuing to heat at 120°C-140°C to further concentrate into dry gel.
Preferably, in Step 4, the oven temperature is 180°C—200°C, and it is dried for 181601413 hours until evenly dried.
Preferably, in Step 5, the specific calcining operation comprises: placing the precursor material obtained in Step 4 into a muffle furnace, calcining at a temperature of 380—400°C for 6-10 hours to obtain a fluffy precursor.
Preferably, in Step 5, the specific grinding operation comprises: taking the obtained fluffy precursor, placing it into an agate mortar, using alcohol as a dispersing agent, and grinding uniformly.
Preferably, in Step 5, the specific sintering operation comprises: placing the powder obtained by grinding into a crucible and sintering at 950—1100°C for 8-12 hours to obtain the cathode material Sr1-xRxCoO3-5 powder.
The beneficial effects of the present invention are as follows:
The cathode material for intermediate and low temperature solid oxide fuel cells provided by the present invention stabilizes the perovskite structure through rare earth element doping, which improves the electrical conductivity of the cathode material. It is particularly suitable for use as a cathode material in intermediate and low temperature solid oxide fuel cells and exhibits excellent performance under intermediate and low temperature operating conditions, specifically as follows:
The electrode polarization resistance is low; under the condition of 750°C, the polarization resistance is only 0.06 Q.cm?, while under the same testing conditions, the polarization resistance of conventional undoped rare earth perovskite oxide cathode materials is 2.1 Q.cm2.
The electrical conductivity at 700°C is 180 S/cm, meeting the requirement of conductivity greater than 100 S/cm under cathode material operating conditions.
Using the above cathode material powder as the cathode to construct an electrolyte-supported single cell, the I-V curve of the cell was tested within the working temperature range of 500-800°C. At 800°C, the open-circuit voltage of the cell is 1.06 V, and the power density is 479 mW/cm?, showing good power output performance of the single cell.
Using the material of this invention as the electrode is suitable for assembling cell$601413 with LSGM and SDC as electrolytes, and good compatibility can be maintained between the electrode and the electrolyte.
The powder obtained by the preparation method described in this invention has fine and uniformly distributed particles, which is beneficial for improving the electrocatalytic activity of cathode materials under intermediate and low temperature conditions, making it suitable for use as a cathode material for intermediate and low temperature solid oxide fuel cells.
Figure 1 is an X-ray diffraction spectrum of the battery cathode material
Sr1-xYxCoO3-5 provided in Experimental Example 1 of the present invention;
Figure 2 is a graph showing the conductivity of the battery cathode material
Sr1-xYxCoO3-5 provided in Experimental Example 2 of the present invention at 300°C~800°C versus temperature;
Figure 3 is a polarization resistance of a symmetrical cell with LSGM as the electrolyte of the battery cathode material Sr1-xYxCoO3-5 provided in Experimental
Example 3 of the present invention at different temperatures;
Figure 4 is an X-ray diffraction spectrum of the battery cathode material
Sr1-xYxCoO3-5 provided in Experimental Example 4 of the present invention after being mixed with the electrolyte LSGM and SDC and calcined at 950°C for 2 hours;
Figure 5 is an |-V curve of a single cell with the battery cathode material
Sr1-xYxCoO3-5 provided in Experimental Example 5 of the present invention as the cathode and NiO-SDC as the anode.
DETAILED DESCRIPTION OF THE INVENTION LU601413
Example 1: Synthesis of Intermediate and Low Temperature Solid Oxide Fuel Cell
Cathode Material Sr0.9Y0.1C003-5
In the general formula Sr1-xRxCoO3-5 of the cathode material, when Ris Y and x = 0.1, it is Sr0.9Y0 .1C003-5. According to the proportion of 0.05 mol Sr0 .9YO .1C003-5, weigh 9.523 g of Sr(NO3)2 (analytical grade), 1.915 g of Y(NO3)3 6 H20O (analytical grade), and 14.554 g of Co(NO3)2-6H20( (analytical grade), respectively;
Slowly add the above materials into a beaker containing 200 mL of deionized water to completely dissolve them, stir evenly, then add 58.446 g of EDTA (analytical grade) and 19.214 g of citric acid (analytical grade) in sequence into the mixed solution and stir thoroughly. Add NH3 -H20 solution dropwise into the mixed solution until the solution becomes transparent, adjust the pH value to 8, then add deionized water to 500 mL;
Place the beaker containing the solution on a magnetic stirrer to heat and stir, set the temperature to 90°C, and stir evenly until it becomes a viscous colloid, then adjust the temperature to 120°C and further concentrate it into a dry gel;
Then place the beaker in an oven at 200°C and dry it for 20 hours to obtain a black precursor material;
Place the above precursor material in a muffle furnace and calcine at 400°C for 8 hours to remove moisture and part of the organic matter, obtain a black powder, take out the black powder and grind evenly in an agate mortar using alcohol as a dispersant, then place it into a crucible;
Place the crucible in a muffle furnace at 1000°C and sinter for 10 hours to obtain the required cathode material Sr0.9Y0.1C0O3-0.
Example 2: Synthesis of Intermediate and Low Temperature Solid Oxide Fuel Cell
Cathode Material Sr0.8Y0.2C003-5
In the general formula Sr1-xRxCoO3-5 of the cathode material, when R is Y and x = 0.2, it is Sr0 .8Y0 .2C003-d. According to the proportion of 0.05 mol Sr0 .8Y0 2C0O3-3, weigh 8.465 g of Sr(NOs), (analytical grade), 3.829 g of Y(NO3)3 6H20 (analytical grade), and 14.554 g of Co(NO3)2 6H20 (analytical grade), respectively;
Slowly add the above materials into a beaker containing 200 mL of deionized waté#601413 to completely dissolve them, stir evenly, then add 58.446 g of EDTA (analytical grade) and 19.214 g of citric acid (analytical grade) in sequence into the mixed solution and stir thoroughly. Add NH3 -H20 solution dropwise into the mixed solution until the solution becomes transparent, adjust the pH value to 8, then add deionized water to 500 mL;
Place the beaker containing the solution on a magnetic stirrer to heat and stir, set the temperature to 90°C, and stir evenly until it becomes a viscous colloid, then adjust the temperature to 120°C and further concentrate it into a dry gel;
Then place the beaker in an oven at 200°C and dry it for 20 hours to obtain a black precursor material;
Place the above precursor material in a muffle furnace and calcine at 400°C for 8 hours to remove moisture and part of the organic matter, obtain a black powder, take out the black powder and grind evenly in an agate mortar using alcohol as a dispersant, then place it into a crucible;
Place the crucible in a muffle furnace at 1000°C and sinter for 10 hours to obtain the required cathode material Sr0.8Y0.2C003-0.
Example 3: Synthesis of Intermediate and Low Temperature Solid Oxide Fuel Cell
Cathode Material Sr0.7Y0.3C003-5
In the general formula Sr1-xRxCoO3-5 of the cathode material, when R is Y and x = 0.3, it is Sr0.7Y0 .3Co03-0. According to the proportion of 0.05 mol Sr0.7Y0 3C003-3, weigh 7.407 g of Sr(NOs)2 (analytical grade), 5.738 g of Y(NO3)3 6 H20 (analytical grade), and 14.554 g of Co(NO3)2 6H20 (analytical grade), respectively;
Slowly add the above materials into a beaker containing 200 mL of deionized water to completely dissolve them, stir evenly, then add 58.446 g of EDTA (analytical grade) and 19.214 g of citric acid (analytical grade) in sequence into the mixed solution and stir thoroughly. Add NH3 -H20 solution dropwise into the mixed solution until the solution becomes transparent, adjust the pH value to 8, then add deionized water to 500 mL;
Place the beaker containing the solution on a magnetic stirrer to heat and stir, set the temperature to 90°C, and stir evenly until it becomes a viscous colloid, then adjust the temperature to 120°C and further concentrate it into a dry gel;
Then place the beaker in an oven at 200°C and dry it for 20 hours to obtain a bladk/601413 precursor material;
Place the above precursor material in a muffle furnace and calcine at 400°C for 8 hours to remove moisture and part of the organic matter, obtain a black powder, take out the black powder and grind evenly in an agate mortar using alcohol as a dispersant, then place it into a crucible;
Place the crucible in a muffle furnace at 1000°C and sinter for 10 hours to obtain the required cathode material Sr0.7Y0.3C0O3-0.
Synthesis of Sr9.99Y0.01C003-53, a cathode material of low-temperature solid oxide fuel cell in Example 4 1. In the general formula of the cathode material Sr1-xRxCoO3-5, when R is Y and x=0.01, it is Sr9.99Y0.01C0O3-5. According to the ratio of 0.05mol Sr9 99Y0 .01C003-, 10.476gSr(NO3)2 (analytical grade), 0.191gY(NO3)3-6H20 (analytical grade), and 14.554g Co(NO3)2'6H20 (analytical grade) were weighed respectively; 2. The above materials were slowly added into a beaker containing 200mL of deionized water to completely dissolve them, and stirred evenly. 58.446g EDTA (analytical grade) and 19 .214g citric acid (analytical grade) is added to the mixed solution in sequence and stirred thoroughly.
NHz>-H:0 solution is added dropwise to the mixed solution until the solution becomes transparent and the pH value is adjusted to 8, and then deionized water is added to 500mL; 3. The beaker containing the solution is placed on a magnetic stirrer for heating and stirring, and the temperature is set to 90°C. After stirring evenly until a viscous colloid is obtained, the temperature is adjusted to 120°C, and further concentrated into a dry gel; 4. The beaker is then placed in a 200°C oven and dried for 20 hours to obtain a black precursor material.
5. The above precursor materials were calcined at 400°C in a muffle furnace for 8/601413 hours to remove moisture and some organic matter to obtain black powder. The black powder was taken out and put into an agate mortar. It was ground evenly with alcohol as a dispersant and then put into a crucible; 6. The crucible was placed in a muffle furnace at 1000°C and calcined for 10 hours to obtain the required cathode material Sr0.99Y0.01C0O3-0.
Example 5 Synthesis of low-temperature solid oxide fuel cell cathode material
YCoOs.5 1. In the general formula of the cathode material Sr1-xRxCoO3-5, when R is Y and when x=1, it is YCoO3-5. According to the ratio of 0.05mol YCoO3-5, 19.146gY(NO3)3 -6H20 (analytical grade) and 14.554g Co(NO3)2 :6H20 (analytical grade) are weighed respectively; 2. The above materials are slowly added to a beaker containing 200mL of deionized water to completely dissolve them and stir evenly. 58.446g EDTA (analytical grade) and 19.214g citric acid (analytical grade) are added to the mixed solution in turn and stirred thoroughly. NHz:H20 solution is added dropwise to the mixed solution until the solution becomes transparent and the pH value is adjusted to 8, and then deionized water is added to 500mL; 3. Place the beaker containing the solution on a magnetic stirrer and heat and stir at 90°C. After stirring evenly until a viscous colloid is formed, adjust the temperature to 120°C and further concentrate it into a dry gel; 4. Then place the beaker in a 200°C oven and dry it for 20 hours to obtain a black precursor material. 5. Place the precursor material in a muffle furnace and calcine it at 400°C for 8 hours to remove moisture and some organic matter to obtain a black powder. Take out the black powder, put it in an agate mortar, grind it evenly with alcohol as a dispersant, and then put it into a crucible; 6. Place the crucible in a 1000°C muffle furnace and roast it for 10 hours to obtain the required cathode material YCoO3-0.
Synthesis of low-temperature solid oxide fuel cell cathode material Sr1-xPrxCoO313/601413 in Example 6 1. In the general formula of the cathode material Sr1-xRxCoO3-5, when R is Pr, it is
Sr1-xPrxCoO3-3, 2. Experimental group 1, when x=0.1, it is Sr0.9Pr0.1C003-, according to the ratio of 0.05mol Sr0.9Pr0.1C0O3-3, 9.523g Sr(NO3)2 (analytical pure), 3.010g Pr(NO3)3 -6H20 (analytical pure), 14.554g Co(NO3)2 - 6H20 (analytical pure); 3. Experimental group 2, when x=0.01, it is Sr9 99Pr0 .01C0O3-5, according to 0.05mol According to the ratio of Sr9 99Pr0 .01C0O3-5, 10.476g Sr(NO3)2 (analytical grade), 0.218g Pr(NO3)3 ©H2O (analytical grade), and 14.554g Co (NO3)2 6
H2O(analytical grade) were weighed respectively; 4. Experimental group 3, when x=1, it iPrCoO3-5, according to the ratio of 0.05mol
PrCoO3-5, 21.750g Pr(NO3)3@+#0 (analytical grade) and 14.554g Co(NO3)2-6H20 (analytical grade) were weighed respectively; 5. The experimental groups 1 to 3 respectively prepare the battery cathode materials according to steps 2 to 6 in Example 1.
Synthesis of the low-temperature solid oxide fuel cell cathode material
Sr1-xNdxCoO3-5 in Example 7 1. In the general formula of the cathode material Sr1-xNdxCoO3-3, when R is Nd, it is
Sr1-xNdxCoO3-5; 2. Experimental group 1, when x = 0.1, it is Sr0.9Nd0.1C003-3, according to the ratio of 0.05mol Sr0.9Nd0.1C003-, 9.523g Sr(NOs)a (analytical grade), 2.192g
Nd(NO3)s-6H:0 (analytical grade), 14.554g Co(NO3)»6H20 (analytical grade) were weighed respectively; 3. Experimental group 2, when x = 0.01, it is Sr1-xDyxCoO3-5, according to the ratio of 0.05mol Sr1-xRxCoO3-3, 10.570g Sr(NOs3)2 (analytical grade), 0.219g Nd(NO3)3 6H20 (analytical grade), 14.554g Co (NO3)2 6H20(analytical grade); 4. Experimental group 3, when x=1, it is NdCoOz-, according to the ratio of 0.05mol
NdCoOs.5, 21.9189 Nd(NO3)s -6H20 (analytical grade), 14.554g Co(NOs)z -6H20 (analytical grade);
5. The experimental groups 1-3 respectively prepared the battery cathode materialg/601413 according to steps 2-6 in Example 1.
Synthesis of low-temperature solid oxide fuel cell cathode material Sr1-xGdxCoO3-5 in Example 9 1. In the general formula of the cathode material Sr1-xRxCoO3-5, when R is Gd, it is
Sr1-xRxCoO3-3; 2. Experimental group 1, when x=0.1, it is Sr0.9Gd0.1C003-55, according to the ratio of 0.05mol Sr0.9Gd0.1Co03-5, 9.523g Sr(NOs3)2 (analytical pure), 2.257g Gd(NO3)3 -6H20 (analytical pure), 14.554g Co(NO3)2 - 6H20 (analytical pure); 3. Experimental group 2, when x=0.01, it isSr9 .99Gd0 01C0O3-5, according to 0.05mol According to the ratio of Sr9 .99Gd0 .01C003-5, 10.570g Sr(NO3)» (analytical pure), 0.226g Gd(NO3)3 :6H20 (analytical pure), and 14.554g Co (NO3)2: 6 RO (analytical pure) were weighed respectively; 4. Experimental group 3, when x=1, it is GdCoO3-5,, according to the ratio of 0.05mol
GdCo03-5, 22.568g Gd(NO3)s&R0 (analytical pure) and 14.554g Co(NO3)2 6H 20 (analytical pure) were weighed respectively; 5. The experimental groups 1-3 were prepared according to steps 2-6 in Example 1 respectively to prepare the battery cathode materials.
The value of à in the above Examples 1-9, that is, the oxygen content, depends on the experimental conditions and will not be discussed here.
Experimental Example 1 Crystal structure detection
The cathode material Sr0.9Y0.1C0O3-5 obtained in Example 1, the cathode material
Sr0.8Y0.2C003-5 obtained in Example 2, and the cathode material
Sr0.8Y0.2Co03-dobtained in Example 3 were determined to have a cubic perovskite structure by XRD powder diffraction method, and the X-ray diffraction spectrum is shown in Figure 1.
Experimental Example 2 Conductivity Determination Test LU601413 1.8g of the cathode material Sr0.9Y0.1C0O3-5 obtained in Example 1, the cathode material Sr0.8Y0.2C0O3-5 obtained in Example 2, and the cathode material Sr0 .7Y0 .3C003-5 obtained in Example 3 were weighed, mixed evenly with 0.2g PVA, and dried, dry pressed at 20Mpa, and calcined at 1100°C in a high-temperature furnace for 12 hours to obtain three dense rod-shaped cathode materials. The conductivity and thermal expansion coefficient were tested respectively. The conductivity of the material in the range of 100-800°C was measured by the four-terminal lead method. As shown in Figure 2, all meet the requirement that the conductivity of the cathode material is greater than 100S/cm under working conditions.
The compact rod-shaped cathode material made of the cathode material
Sr0.9Y0.1Co03-dobtained in Example 1 has an electrical conductivity of 180S/cm at 700°C;
The compact rod-shaped cathode material made of the cathode material
Sr0.8Y0.2C003-5 obtained in Example 2 has an electrical conductivity of 252S/cm at 700°C;
The compact rod-shaped cathode material made of the cathode material
Sr0.7Y0.3C003-5 obtained in Example 3 has an electrical conductivity of 340S/cm at 700°C.
Experimental Example 3 Cathode polarization resistance measurement test
The cathode material Sr0.9Y0.1Co03-5 obtained in Example 1, the cathode material
Sr0.8Y0.2C003-5 obtained in Example 2, and the cathode material Sr0.7Y0.3C003-5 obtained in Example 3 were uniformly mixed with appropriate amounts of ethyl cellulose and pine alcohol to form a slurry, and then symmetrically coated on both sides of the dense LSGM circular electrolyte by screen printing, calcined at 950°C for 2 hours to make 3 symmetrical electrodes, and the polarization resistance of the electrodes was tested by electrochemical impedance spectroscopy technology, as shown in Figure 3, all of which meet the requirements for the polarization resistance of the cathode material under the working conditions of the solid oxide fuel cell.
The symmetrical electrode made of cathode material Sr0.9Y0.1C0O3-6ffill obtainéd/601413 in Example 1 has a polarization resistance of 0.06Qcm2 at 750°C;
The symmetrical electrode made of cathode material Sr0.8Y0.2C003-5 obtained in
Example 2 has a polarization resistance of 0.13Qcm2 at 750°C;
The symmetrical electrode made of cathode material Sr0.7Y0 .3Co03-0 obtained in
Example 3 has a polarization resistance of 0.19Qcm2 at 750°C.
Experimental Example 4 Detection of the compatibility of cathode material and electrolyte material
Weigh two portions of cathode material Sr0 .9Y0 .1C003-5 0.1g powder obtained in
Example 1, one portion is mixed evenly with an equal mass of electrolyte LSGM powder, and the other portion is mixed evenly with an equal mass of electrolyte SDC powder. Both are calcined at 950°C in air for 2 hours to detect the compatibility of cathode material and electrolyte material. As shown in Figure 4, XRD powder diffraction shows that cathode material maintains good chemical compatibility with electrolyte LSGM and SDC.
Experimental Example 5 Detection of the I-V Curve of the Cathode Material as a
Single Cell
The cathode materialSr0 .9Y0 .1C0O3-5 powder 0.1g obtained in Example 1 was used as the cathode, LSGM was used as the electrolyte (thickness 300um), SDC was used as the buffer layer, NiO-SDC was used as the anode (mass ratio NiO: SDC = 65:35), and a single cell supported by the electrolyte was constructed. The I-V curve of the battery was tested in the operating temperature range of 500-800°C. As shown in Figure 5, at 800°C, the open circuit voltage of the battery was 1.06V, and the power density was 479mW/cm2. The single cell had good power output performance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (8)
1. A cathode material for intermediate and low temperature solid oxide fuel cells, characterized in that its composition has the general formula Sr1-xRxCoO3-5, wherein:
0.01 <x< 1.0,0<5<05, andR is Pr, Y, Nd, Dy, or Gd.
2.A preparation method of the cathode material for intermediate and low temperature solid oxide fuel cells according to claim 1, characterized in that it specifically comprises the following steps: step 1: according to the chemical formula of the cathode material, nitrates of element Sr, element R, and element Co are weighed separately in stoichiometric proportions, wherein R is Pr, Y, Nd, Dy, or Gd; Step 2: the materials weighed in Step 1 are dissolved in deionized water and mixed evenly, then ethylenediaminetetraacetic acid and citric acid are added as dual chelating agents, ammonia water is added, stirred until uniform and transparent to obtain a mixed solution; Step 3: the mixed solution obtained in Step 2 is adjusted to pH 8, and heated under conditions of 90°C—140°C, stirred and evaporated to remove moisture and concentrated into dry gel; Step 4: the dry gel obtained in Step 3 is evenly dried to obtain a black precursor material, Step 5: The precursor material obtained in Step 4 is calcined, then ground and sintered to obtain the cathode material Sr1-xRxCoO3-5 powder.
3. The preparation method of the cathode material for intermediate and low temperature solid oxide fuel cells according to claim 2, characterized in that, in Step 2, the molar ratio of EDTA:metal ions:citric acid in the mixed solution is 2:1:1.
4. The preparation method of the cathode material for intermediate and low temperature solid oxide fuel cells according to claim 2, characterized in that, in Step 3, the heating and concentrating specifically comprises: adjusting the solution pH to 8, first heating at 90°C—100°C, stirring and evaporating to remove water until it becomes a viscous gel, then continuing to heat at 120°C-140°C to further concentrate into dry gel.
5. The preparation method of the cathode material for intermediate and lo#/601413 temperature solid oxide fuel cells according to claim 2, characterized in that, in Step 4, the oven temperature is 180°C—200°C, and it is dried for 18-20 hours until evenly dried.
6. The preparation method of the cathode material for intermediate and low temperature solid oxide fuel cells according to claim 2, characterized in that, in Step 5, the specific calcining operation comprises: placing the precursor material obtained in Step 4 into a muffle furnace, calcining at a temperature of 380-400°C for 6-10 hours to obtain a fluffy precursor.
7. The preparation method of the cathode material for intermediate and low temperature solid oxide fuel cells according to claim 6, characterized in that, in Step 5, the specific grinding operation comprises: taking the obtained fluffy precursor, placing it into an agate mortar, using alcohol as a dispersing agent, and grinding uniformly.
8. The preparation method of the cathode material for intermediate and low temperature solid oxide fuel cells according to claim 7, characterized in that, in Step 5, the specific sintering operation comprises: placing the powder obtained by grinding into a crucible and sintering at 950-1100°C for 8-12 hours to obtain the cathode material Sr1-xRxCoO3-5 powder.
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