KR102213228B1 - Cathode material for solid oxide fuel cells containing non-stoichiometric layered perovskite oxide, and cathode for intermediate temperature-operating solid oxide fuel cells including the same - Google Patents

Abstract

The present invention relates to a cathode material for a solid oxide fuel cell, and a cathode for a solid oxide fuel cell comprising the same, which can exhibit excellent cathode properties by including a first layered perovskite oxide of a stoichiometric composition and a second layered perovskite oxide of a non-stoichiometric composition.

Description

Cathode material for solid oxide fuel cells containing non-stoichiometric layered perovskite oxide, and cathode material for solid oxide fuel cells containing layered perovskite oxide based on non-stoichiometric composition, and cathode for intermediate temperature-operating solid oxide fuel cells including the same}

The present invention relates to a cathode material for a solid oxide fuel cell including a layered perovskite oxide based on a non-stoichiometric composition, and a cathode material for a medium and low temperature solid oxide fuel cell including the same.

SOFC (Solid Oxide Fuel Cells) is an energy conversion device that directly converts electrical energy from high temperature using chemical energy of oxygen and hydrogen. Solid oxide fuel cells are made of ceramic and operate at high temperatures (600-1000℃), so they do not require additional noble metal catalysts, but long-term performance such as chemical reaction of electrodes and poisoning of chromium (Cr) when driven at high temperatures There is a problem with

In order to solve this problem, many domestic and foreign research institutes are focusing on research and development of intermediate temperature-operating solid oxide fuel cells (IT-SOFC).

However, in the case of IT-SOFC, as problems such as low ionic conductivity and oxygen reduction reaction (ORR, Oxygen Reduction Reaction) of the cathode are reported when operating at a relatively low temperature, research and development of cathode materials showing more excellent cathode characteristics are required. Actually.

Korean Patent Publication No. 10-1213060 is proposed as a similar prior document for this.

Republic of Korea Patent Publication No. 10-1213060 (2012.12.11.)

In order to solve the above problems, the present invention provides a cathode material for a solid oxide fuel cell including a layered perovskite oxide based on a non-stoichiometric composition showing excellent cathode characteristics, and a cathode material for a medium and low temperature solid oxide fuel cell including the same. It aims to provide.

One aspect of the present invention for achieving the above object is a first layered perovskite oxide having a stoichiometric composition satisfying the following Formula 1 and a second layered perovskite oxide having a non-stoichiometric composition satisfying the following Chemical Formula 2 It relates to a cathode material for a solid oxide fuel cell comprising a.

[Formula 1]

A ^/ A ^// _0.5 A ^/// _0.5 B ₂ O _5+δ

[Formula 2]

A ^/ _x A ^// _0.5 A ^/// _0.5 B ₂ O _5+δ

(In Formulas 1 and 2,

A ^/ is a lanthanide element, A ^// and A ^/// are different alkaline earth metal elements, and B is a transition metal element; x is a real number that satisfies 0.85≤x<1.)

In the above aspect, in Formulas 1 and 2, A ^/ may be lanthanum (La), samarium (Sm), neodymium (Nd), praseodymium (Pr), or gadolinium (Gd).

In one aspect, in Formulas 1 and 2, A ^/ is samarium (Sm), A ^// is barium (Ba), A ^/// is strontium (Sr), and B is cobalt (Co). ; x may be a real number satisfying 0.85≤x<1.

In the above aspect, the second layered perovskite oxide may satisfy 0.9≦x≦0.97.

In the above aspect, the weight ratio of the first layered perovskite oxide to the second layered perovskite oxide may be 70:30 to 30:70.

In the above aspect, the area specific resistance (ASR) at 700°C of the half-cell made of the material may be 0.15 Ωcm2 or less, and the area specific resistance (ASR) at 800°C may be 0.06 Ωcm2 or less.

In the above aspect, the power density at 700°C of the unit cell made of the material may be 0.65 W/cm2 or more, and at 800°C, the power density may be 1.8 W/cm2 or more.

In addition, another aspect of the present invention relates to a cathode for a solid oxide fuel cell including the cathode material for a solid oxide fuel cell described above.

In the other aspect, the cathode for a solid oxide fuel cell may be for a medium-low temperature solid oxide fuel cell or a high temperature solid oxide fuel cell.

In addition, another aspect of the present invention is the cathode for a solid oxide fuel cell described above; An anode disposed facing the cathode; And it relates to a solid oxide fuel cell comprising; an electrolyte disposed between the cathode and the anode.

The cathode material for a solid oxide fuel cell according to the present invention is an excellent cathode by mixing a stoichiometric first layered perovskite oxide that satisfies Formula 1 and a non-stoichiometric second layered perovskite oxide that satisfies Formula 2. Can show characteristics.

1 is a graph showing the result of measuring the power density W/㎠) according to the current density (㎃/㎠) of the unit cell manufactured according to Example 3.
2 is a graph showing the measurement result of power density W/㎠) according to the current density (㎃/㎠) of the unit cell manufactured according to Comparative Example 1.
3 is a graph showing the measurement result of power density W/㎠) according to the current density (㎃/㎠) of the unit cell manufactured according to Comparative Example 2.
4 is a graph showing the result of measuring the power density (W/㎠) according to the current density (㎃/㎠) of the unit cell manufactured according to Comparative Example 3.

Hereinafter, a cathode material for a solid oxide fuel cell including a layered perovskite oxide based on a non-stoichiometric composition according to the present invention, and a cathode material for a medium and low temperature solid oxide fuel cell including the same will be described in detail. The drawings introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be exaggerated to clarify the spirit of the present invention. At this time, unless there are other definitions in the technical terms and scientific terms used, they have the meanings commonly understood by those of ordinary skill in the technical field to which this invention belongs, and the gist of the present invention in the following description and accompanying drawings Descriptions of known functions and configurations that may be unnecessarily obscure will be omitted.

In general, the electrochemical reaction of a solid oxide fuel cell is an anode reaction in which the oxygen gas O ₂ of the cathode cathode is changed to oxygen ions O ^2- and the fuel (H ₂ or hydrocarbon) of the anode anode and electrolyte It consists of a cathodic reaction in which oxygen ions that have been transferred through the reaction react.

<Reaction Scheme>

Anode ^{_{reaction: 1/2 O 2 + 2e - -}} > O 2-

Cathode ^{_{reaction: H 2 + O 2- ->}} H 2 O + 2e -

In the cathode of a solid oxide fuel cell, oxygen adsorbed on the electrode surface undergoes dissociation and surface diffusion, and then moves to the triple phase boundary where the electrolyte, cathode, and pores meet to obtain electrons and become oxygen ions. Since it moves to the anode through the electrolyte, the reaction speed of the electrode can be improved by increasing the area of the three-phase interface where the anode reaction occurs.

On the other hand, the basic perovskite structure represented by ABO ₃ has a large ion radius such as rare earth elements, alkaline rare earth, and alkaline in the A-site, which is a corner position of the cubic lattice. Elements are located and have a 12 coordination number (CN) by oxygen ions. A transition metal with a small atomic radius such as cobalt (Co) or iron (Fe) is located at the B-site, which is the body center of the cubic lattice, and forms an octahedron (6 coordination number) by oxygen ions. . Finally, oxygen ions are located at the center of each face of the cubic lattice.

The perovskite structure is generally A- site to another, and the structural displacement occurs when material is substituted, mainly consisting of BO ₆ nearest neighbor oxygen ions (6) thereof, around the element in the site B- Structural mutations occur in the octahedron.

The perovskite according to the present invention is a layered perovskite oxide having a chemical composition of A ^/ A ^// A ^/// B ₂ O _5+δ , and the layered perovskite oxide is an oxygen vacancy cluster The presence of this makes the movement of ions easier, thereby imparting improved ionic conductivity to the cathode.

In particular, the present inventors removed some of the elements located in the A ^/ -site from the layered perovskite oxide having a chemical composition of A ^/ A ^// A ^/// B ₂ O _{5 + δ} , The present invention was found to be able to secure the cathode characteristics more than required by SOFC when using a mixture of a stoichiometric layered perovskite oxide and a non-stoichiometric layered perovskite oxide to prepare a robesite oxide. It came to completion.

Specifically, an aspect of the present invention comprises a first layered perovskite oxide having a stoichiometric composition satisfying the following Formula 1 and a second layered perovskite oxide having a non-stoichiometric composition satisfying the following Chemical Formula 2 It relates to a cathode material for a solid oxide fuel cell.

[Formula 1]

A ^/ A ^// _0.5 A ^/// _0.5 B ₂ O _5+δ

[Formula 2]

A ^/ _x A ^// _0.5 A ^/// _0.5 B ₂ O _5+δ

In Formulas 1 and 2, A ^/ is a lanthanide element, A ^// and A ^/// are different alkaline earth metal elements, and B is a transition metal element; x is a real number that satisfies 0.85≦x<1. At this time, in Formulas 1 and 2, A ^/ may be lanthanum (La), samarium (Sm), neodymium (Nd), praseodymium (Pr), or gadolinium (Gd).

In the layered perovskite oxides of Formulas 1 and 2, the stacking permutations of [BO ₂ ]-[A ^/ O]-[BO ₂ ]-[A ^// O] are basically repeated along the c-axis, and A ^// It can be understood as a structure in which a part of is replaced with A ^/// . It is not intended to be bound by any specific theory regarding the operating principle of the present invention, but for better understanding, the stacking permutation of [BO ₂ ]-[A ^/ O]-[BO ₂ ]-[A ^// O] If repeated along the c-axis, the oxygen binding force in the [A ^/ O] layer is weakened, providing disordered vacancy. Therefore, when the cathode is formed, the diffusion rate of oxygen ions in the bulk of the cathode is significantly improved. In addition, it is possible to supply a surface defect site that improves the reduction reactivity of molecular oxygen to oxygen ions.

In this case, δ in Formulas 1 and 2 may represent interstitial oxygen, and the conductivity of oxygen ions may be improved by including this. As a specific example, δ may have a value greater than 0 and less than 0.5, but is not limited thereto, and the value of δ may be determined according to a specific crystal structure.

More preferably, in Formulas 1 and 2, A ^/ is samarium (Sm), A ^// is barium (Ba), A ^/// is strontium (Sr), and B is cobalt (Co); x may be a real number satisfying 0.85≤x<1. That is, the cathode material for a solid oxide fuel cell according to an embodiment of the present invention has a first layered perovskite oxide having a stoichiometric composition that satisfies the following Formula 1-1 and a non-stoichiometric composition that satisfies the following Formula 2-1. It may include a second layered perovskite oxide.

[Formula 1-1]

Sm ₁ Ba _0.5 Sr _0.5 Co ₂ O _5+δ

[Formula 2-1]

Sm _x Ba _0.5 Sr _0.5 Co ₂ O _5+δ (0.85≤x<1)

More preferably, the second layered perovskite oxide may satisfy 0.9≦x≦0.97, and more preferably, may satisfy 0.93≦x≦0.96.

As such, the cathode material for a solid oxide fuel cell according to the present invention can exhibit excellent cathode characteristics by mixing two layered perovskite oxides satisfying the above composition.

Particularly preferably, by mixing two layered perovskite oxides satisfying the above composition in an appropriate ratio, it is possible to secure more excellent cathode characteristics, and as a specific example, the first layered perovskite oxide: second layered perovskite oxide The weight ratio of the skyt oxide may be 70:30 to 30:70, more preferably 60:40 to 40:60.

By mixing the first layered perovskite oxide and the second layered perovskite oxide in the above range, the area specific resistance (ASR) at 700°C of the half-cell made of the cathode material for the solid oxide fuel cell was 0.15 Ω ㎠ or less, and the area specific resistance (ASR) at 800℃ can be 0.06 Ω㎠ or less, and more preferably at 700℃, the area specific resistance (ASR) is 0.10 Ω㎠ or less, and at 800℃ the area specific resistance (ASR) is 0.04 Ω㎠ It can be below. In addition, the power density of the single cell made of the cathode material for a solid oxide fuel cell may be 0.65 W/㎠ or more at 700℃, and the power density at 800℃ may be 1.8 W/㎠ or more, and more preferably, the power at 700℃. The density may be 0.65 W/cm2 or more, and the power density at 800°C may be 2.0 W/cm2 or more. At this time, the lower limit of the area specific resistance ASR is not particularly limited, but may be 0 Ωcm2 or more, and the upper limit of the power density may be 5 W/cm2 or less, but is not limited thereto.

Accordingly, the cathode material for a solid oxide fuel cell may be utilized as a cathode material for a mobile fuel cell, a power generation fuel cell, or a solid oxide electrolytic cell.

On the other hand, the manufacturing method of the first layered perovskite oxide that satisfies Formula 1 and the second layered perovskite oxide that satisfies Formula 2 may be performed through a traditional solid state reaction (SSR) method. In the case of preparing Sm _x Ba _0.5 Sr _0.5 Co ₂ O _5+δ layered perovskite oxide, for example, Sm ₂ O ₃ powder, Co ₃ O ₄ powder, BaCO ₃ powder and SrCO ₃ powder are prepared. Preparing a powder mixture by weighing and mixing according to the composition of the desired perovskite oxide; Subjecting the powder mixture to a first heat treatment at 950 to 1050° C. for 5 to 7 hours; And secondary heat treatment of the powder mixture subjected to the first heat treatment at 1050 to 1150° C. for 7 to 9 hours. As described above, a layered perovskite oxide having excellent electrical conductivity and area specific resistance properties can be manufactured by passing through the secondary heat treatment process.

In addition, another aspect of the present invention relates to a cathode for a solid oxide fuel cell including the cathode material for a solid oxide fuel cell described above.

Specifically, the cathode for a solid oxide fuel cell according to an example of the present invention may be manufactured from an ink for cathode comprising the cathode material for a solid oxide fuel cell, an organic binder, and a solvent, and the content of each component is at a normal level. Although not particularly limited, for example, the cathode ink may include 1 to 10 parts by weight of an organic binder and 50 to 500 parts by weight of a solvent based on 100 parts by weight of a cathode material for a solid oxide fuel cell.

The organic binder is used to increase the adhesion between the granules of the cathode material for the solid oxide fuel cell and the electrolyte layer, and if it is commonly used in the art, it may be used without particular limitation. As a specific example, polyvinyl butyral, poly It may be any one or two or more selected from the group consisting of vinyl acetal, polyethylene, polypropylene, polystyrene, polyvinyl alcohol, polybutyl acetate, and polyvinylpyrrolidone.

The solvent is intended to allow the respective constituents to be well mixed, and if it is commonly used in the art, it can be used without particular limitation, and as a specific example, consisting of water, methanol, ethanol, isopropanol, acetone and toluene, etc. It may be any one or two or more mixed solvents selected from the group.

When the cathode ink is prepared as described above, after coating the cathode ink on the electrolyte layer by a screen printing method and heat treatment at 800 to 1500°C for 30 minutes to 3 hours, a cathode for a solid oxide fuel cell can be prepared. Of course, this is only an example and is not necessarily limited thereto.

In addition, another aspect of the present invention relates to a solid oxide fuel cell including the cathode for a solid oxide fuel cell described above, and in detail, a cathode for a solid oxide fuel cell; An anode disposed facing the cathode; And it relates to a solid oxide fuel cell comprising; an electrolyte disposed between the cathode and the anode. At this time, the anode and the electrolyte may be any known ones.

Hereinafter, a cathode material for a solid oxide fuel cell including a layered perovskite oxide based on a non-stoichiometric composition according to the present invention, and a cathode material for a medium and low temperature solid oxide fuel cell including the same will be described in more detail through examples. However, the following examples are only one reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

In addition, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terms used in the description herein are merely to effectively describe specific embodiments and are not intended to limit the invention. In addition, the unit of the additive not specifically described in the specification may be a weight %.

[Production Examples 1 to 6] Synthesis of layered perovskite oxide

Sm _x Ba _0.5 Sr _0.5 Co ₂ O _5+δ layered perovskite oxide was synthesized through a traditional solid state reaction (SSR) method.

For an accurate experiment, the reagent grade Sm ₂ O ₃ powder, Co ₃ O ₄ powder, BaCO ₃ powder and SrCO ₃ powder are heat-treated for 1 hour in an electric furnace at 150℃ to remove moisture, and then the error range is ±0.001 according to the target composition. Weighed the correct weight to g.

Each weighed powder was mixed with an ethanol solvent through ball milling, followed by heat treatment at 1000°C for 6 hours and 1100°C for 8 hours in an air atmosphere to synthesize Sm _x Ba _0.5 Sr _0.5 Co ₂ O _5+δ , The composition of each layered perovskite oxide is shown in Table 1 below.

[Production Examples 7 to 12] Synthesis of layered perovskite oxide

Pr _x Ba _0.5 Sr _0.5 Co ₂ O _5+δ layered perovskite oxide was synthesized through a conventional solid phase synthesis method.

For an accurate experiment, the reagent grade Pr ₆ O ₁₁ powder, Co ₃ O ₄ powder, BaCO ₃ powder and SrCO ₃ powder are heat-treated in an electric furnace at 150°C for 1 hour to remove moisture, and then the error range is ±0.001 according to the target composition. Weighed the correct weight to g.

Each weighed powder was mixed with an ethanol solvent through ball milling, followed by heat treatment at 1000°C for 6 hours and 1100°C for 8 hours in an air atmosphere to synthesize Pr _x Ba _0.5 Sr _0.5 Co ₂ O _5+δ , The composition of each layered perovskite oxide is shown in Table 1 below.

Abbreviation Furtherance Manufacturing Example 1 SBSCO Sm ₁ Ba _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 2 SBSCO-0.95 Sm _0.95 Ba _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 3 SBSCO-0.90 Sm _0.90 Ba _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 4 SBSCO-0.85 Sm _0.85 Ba _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 5 SBSCO-0.80 Sm _0.80 Ba _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 6 SBSCO-0.75 Sm _0.75 Ba _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 7 PBSCO PrBa _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 8 PBSCO-0.95 Pr _0.95 Ba _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 9 PBSCO-0.90 Pr _0.90 Ba _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 10 PBSCO-0.85 Pr _0.85 Ba _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 11 PBSCO-0.80 Pr _0.80 Ba _0.5 Sr _0.5 Co ₂ O _5+δ Manufacturing Example 12 PBSCO-0.75 Pr _0.75 Ba _0.5 Sr _0.5 Co ₂ O _5+δ

[Examples 1 to 14, and Comparative Examples 1 to 6]

SBSCO prepared in Preparation Example 1 and Sm _x Ba _0.5 Sr _0.5 Co ₂ O _5+δ each prepared in Preparation Examples 2 to 6 were mixed in the weight ratio shown in Table 2 to prepare a mixed layered perovskite oxide The PBSCO prepared in Preparation Example 7 and Pr _x Ba _0.5 Sr _0.5 Co ₂ O _5+δ each prepared in Preparation Examples 8 to 12 were mixed in a weight ratio shown in Table 2 below, and mixed layered perovskite oxide Prepared.

Mixed layered perovskite oxide Weight ratio One 2 Example 1 SBSCO SBSCO-0.95 80: 20 Example 2 70: 30 Example 3 50: 50 Example 4 30: 70 Example 5 20: 80 Example 6 SBSCO SBSCO-0.85 50: 50 Example 7 SBSCO-0.75 Example 8 PBSCO PBSCO-0.95 80: 20 Example 9 70: 30 Example 10 50: 50 Example 11 30: 70 Example 12 20: 80 Example 13 PBSCO PBSCO-0.85 50: 50 Example 14 PBSCO-0.75 Comparative Example 1 SBSCO x 100: 0 Comparative Example 2 x SBSCO-0.95 0: 100 Comparative Example 3 x SBSCO-0.85 0: 100 Comparative Example 4 PBSCO x 100: 0 Comparative Example 5 x PBSCO-0.95 0: 100 Comparative Example 6 x PBSCO-0.85 0: 100

[Characteristic evaluation]

1) Area specific resistance (Ω㎠) analysis:

Mixed layered perovskite oxide and Ce _0.9 Gd _0.1 O ₂ (CGO91, Rhodia) powder prepared in Examples 1 to 14 and Comparative Examples 1 to 6, respectively, for electrochemical analysis And a vehicle (vehicle, fuelcell materials) were mixed to prepare a cathode ink, coated on a support by a screen printing method, and then sintered at 1000° C. for 1 hour to produce a half cell.

The electrochemical characteristics of the half-cell were checked using an electrochemical analyzer (Model nStat, HS Technologies) in the atmospheric state and the impedance result in the frequency range of 0.05 Hz to 2.5 MHz in the temperature range of 500 to 900°C, and the results are as follows. It is shown in Table 3.

2) Power density (W/㎠) analysis:

After preparing the buffer layer ink using Ce _0.9 Gd _0.1 O ₂ (CGO91, Rhodia) powder and vehicle (vehicle, fuelcell materials), the buffer layer ink was coated on the electrolyte layer by screen printing, and then 2 at 1300℃. The buffer layer was prepared by sintering for a period of time.

Next, for electrochemical analysis, the mixed layered perovskite oxide prepared in Examples 1 to 14 and Comparative Examples 1 to 6, respectively, and a vehicle (vehicle, fuelcell materials) were mixed to prepare a cathode ink, and then the buffer layer The cells were coated by screen printing and sintered at 1000° C. for 1 hour to produce a cell.

In the power density measurement, the results were measured in a temperature range of 650 to 850°C using a unit cell in a final sintered circular state, and the results are shown in Table 3 below.

Area specific resistance (Ω㎠) Power density (W/㎠) 700℃ 800℃ 700℃ 800℃ Example 1 0.15 0.04 0.66 1.72 Example 2 0.10 0.03 0.66 1.86 Example 3 0.06 0.02 0.69 2.11 Example 4 0.08 0.04 0.65 1.78 Example 5 0.10 0.04 0.63 1.71 Example 6 0.06 0.02 0.43 1.15 Example 7 0.08 0.04 0.35 0.93 Example 8 0.21 0.07 0.61 1.65 Example 9 0.16 0.06 0.65 1.77 Example 10 0.10 0.03 0.67 2.02 Example 11 0.13 0.05 0.61 1.66 Example 12 0.16 0.07 0.58 1.60 Example 13 0.10 0.04 0.31 1.23 Example 14 0.12 0.05 0.29 1.01 Comparative Example 1 0.22 0.05 0.66 1.75 Comparative Example 2 0.10 0.03 0.62 1.69 Comparative Example 3 0.06 0.03 0.32 1.02 Comparative Example 4 0.29 0.08 0.61 1.64 Comparative Example 5 0.16 0.07 0.57 1.58 Comparative Example 6 0.10 0.04 0.26 0.95

As can be seen from Table 1 above, the air electrode manufactured using the mixed perovskite oxide of Examples 1 to 14 has superior area specific resistance and power density characteristics than the air electrode manufactured using a single perovskite oxide. I was able to confirm that it showed.

In particular, 50:50 perovskite oxide of stoichiometric composition and non-stoichiometric composition of A ^/ _0.95 Ba _0.5 Sr _0.5 Co ₂ O _5+δ (A ^/ =Sm or Pr) Examples 3 and 10 mixed with are particularly excellent in area specific resistance and power density, and thus may be suitable for medium and low temperature solid oxide fuel cells or high temperature solid oxide fuel cells.

Although the present invention has been described through the above-specified matters and limited embodiments, this is only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention pertains to Those of ordinary skill in the field can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention is limited to the described embodiments and should not be defined, and all things that are equivalent or equivalent to the claims as well as the claims to be described later fall within the scope of the spirit of the present invention. .

Claims (10)

A cathode material for a solid oxide fuel cell comprising a first layered perovskite oxide having a stoichiometric composition satisfying the following Chemical Formula 1 and a second layered perovskite oxide having a non-stoichiometric composition satisfying the following Chemical Formula 2.
[Formula 1]
A ^/ A ^// _0.5 A ^/// _0.5 B ₂ O _5+δ
[Formula 2]
A ^/ _x A ^// _0.5 A ^/// _0.5 B ₂ O _5+δ
(In Formulas 1 and 2,
A ^/ is a lanthanide element, A ^// and A ^/// are different alkaline earth metal elements, and B is a transition metal element; x is a real number that satisfies 0.85≤x<1.) The method of claim 1,
In Formulas 1 and 2, A ^/ is lanthanum (La), samarium (Sm), neodymium (Nd), praseodymium (Pr), or gadolinium (Gd), a cathode material for a solid oxide fuel cell. The method of claim 1,
In Formulas 1 and 2, A ^/ is samarium (Sm), A ^// is barium (Ba), A ^/// is strontium (Sr), and B is cobalt (Co); x is a real number that satisfies 0.85≤x<1, a cathode material for a solid oxide fuel cell. The method of claim 1,
The second layered perovskite oxide satisfies 0.9≦x≦0.97, a cathode material for a solid oxide fuel cell. The method of claim 1,
The weight ratio of the first layered perovskite oxide: the second layered perovskite oxide is 70:30 to 30:70, a cathode material for a solid oxide fuel cell. The method of claim 1,
The area specific resistance (ASR) at 700°C of the half-cell made of the material is 0.15 Ωcm2 or less, and the area specific resistance (ASR) at 800°C is 0.06 Ωcm2 or less, a cathode material for a solid oxide fuel cell. The method of claim 6,
A cathode material for a solid oxide fuel cell having a power density of 0.65 W/㎠ or more at 700°C and a power density of 1.8 W/㎠ or more at 800°C. A cathode for a solid oxide fuel cell comprising the cathode material for a solid oxide fuel cell according to any one of claims 1 to 7. The method of claim 8,
The cathode for a solid oxide fuel cell is a cathode for a solid oxide fuel cell, which is for a medium-low temperature solid oxide fuel cell or a high-temperature solid oxide fuel cell. The cathode for a solid oxide fuel cell of claim 8;
An anode disposed facing the cathode; And
An electrolyte disposed between the air electrode and the fuel electrode;
Solid oxide fuel cell comprising a.

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