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Cathode material of mid-temperature solid-oxide fuel battery and uses thereof

A fuel cell cathode, solid oxide technology, used in solid electrolyte fuel cells, fuel cells, fuel cell components, etc. The effect of reducing the cathodic polarization resistance and increasing the speed

Inactive Publication Date: 2008-11-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the low catalytic oxygen reduction reaction activity caused by the low oxygen ion conductivity of certain cathode materials in intermediate temperature solid oxide fuel cells and the high oxygen ion conductivity of some cathode materials, it is easy to react with electrolyte materials to form an inert insulating phase. The problem

Method used

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  • Cathode material of mid-temperature solid-oxide fuel battery and uses thereof

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Effect test

Embodiment 1

[0023] LDC modified LSM-YSZ for composite cathode of intermediate temperature solid oxide fuel cell

[0024] Such as figure 1Shown is a schematic structural diagram of an intermediate temperature solid oxide fuel cell, including an anode substrate 1 , an electrolyte membrane 2 and a cathode 3 . The anode substrate is composed of 50% NiO and 50% YSZ. An 800 micron thick NiO-YSZ anode substrate is prepared by rolling film method, and a layer of organic slurry containing 25 micron YSZ is coated on it. After drying, it was pressed under a pressure of 100 MPa, and the two-in-one was co-fired at 1450° C. for 5 hours to obtain an anode / electrolyte assembly.

[0025] LDC powder was synthesized by citric acid method. where La 2 o 3 The molar doping amount is 40%. After mixing LSM, YSZ, and LDC, the content of LSM is 60%, and the mass ratio of LDC to YSZ is 1:3, and then uniformly mixed with the binder to make a slurry, which is coated on YSZ by screen printing. The surface of the...

Embodiment 2

[0028] SDC Modified LSM-YSZ Used as Composite Cathode for Intermediate Temperature Solid Oxide Fuel Cells

[0029] The anode substrate is composed of 60% NiO and 40% YSZ. A NiO-YSZ anode substrate with a thickness of 1000 microns is prepared by casting method, and a layer of organic slurry containing YSZ with a thickness of 25 microns is coated on it. After drying, it was pressed under a pressure of 100 MPa, and the two-in-one was co-fired at 1400° C. for 5 hours to obtain an anode / electrolyte assembly.

[0030] SDC powder was synthesized by hydrothermal method, in which Sm 2 o 3 The molar doping amount is 20%. After mixing LSM, YSZ, and SDC, the content of LSM is 60%, the mass ratio of SDC to YSZ is 1:2, and then uniformly mixed with the binder to make a slurry, and the YSZ electrolyte membrane is prepared by coating method The surface was fired at 1150°C for 2 hours to obtain a cathode with a thickness of 50 microns.

[0031] Using hydrogen as fuel gas and oxygen as oxid...

Embodiment 3

[0033] GDC-modified LSM-YSZ for composite cathodes of intermediate temperature solid oxide fuel cells

[0034] The anode substrate is composed of 50% NiO and 50% YSZ. An 800-micron thick tubular NiO-YSZ anode substrate is prepared by extrusion molding, and a layer of organic slurry with a thickness of 20 microns YSZ is loaded on the anode by spraying. After drying, the two-in-one was co-fired at 1450° C. for 5 hours to obtain an anode / electrolyte assembly.

[0035] Gd and Ce nitrate were impregnated on the LSM-YSZ composite by nitrate impregnation method, in which Gd(NO 3 ) 3 with Ce(NO 3 ) 3 The molar ratio of GDC and YSZ is 1:9, the content of LSM is 60%, the mass ratio of GDC and YSZ is 1:4, and the GDC modified LSM-YSZ powder is obtained by roasting at 850°C. Then it is uniformly mixed with a binder to form a slurry, prepared on the surface of the YSZ electrolyte membrane by plasma spraying method, and fired at 1000° C. for 2 hours to obtain a cathode with a thickness ...

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Abstract

The invention relates to a solid oxide fuel cell, in particular to medium temperature solid oxide fuel cell cathode material and application thereof. Being calculated by a weight percentage, the cathode material consists of 40-99 percent of perovskite-type composite oxides, 1-30 percent of CeO2 doped with rare earth oxides, and 0-59 percent of electrolyte material; the electrolyte material refers to ZrO2 stabilized by 5-20 mol percent of Y2O3 and / or ZrO2 stabilized by 5-20 mol percent of Sc2O3. The invention can change the structure of the active components of the cathode material, can improve the activity of the catalytic oxygen reduction reaction of the cathode material, can accelerate the dissociative adsorption of oxygen on the surface of the cathode material, the diffusion of oxygen species on the surface of the cathode material, the transmission process of the oxygen species in a three-phase bounded domain, charge transfer, and other electrochemical processes, and can increase the activity of the cathode of the solid oxide fuel cell.

Description

technical field [0001] The invention relates to a solid oxide fuel cell, in particular to a medium-temperature solid oxide fuel cell cathode material and its application. CeO doped with highly active rare earth oxides in the cathode 2 Materials, changing the structure of the active components of the cathode material, improving the activity of the cathode material to catalyze the oxygen reduction reaction, thus promoting the development of solid oxide fuel cell technology. Background technique [0002] Solid oxide fuel cell is an energy conversion device that directly converts chemical energy into electrical energy. It adopts an all-solid structure and has the characteristics of high power generation efficiency and wide application range. It is an ideal technology for decentralized power generation and centralized power stations, and can also be used for vehicle auxiliary power supply, portable power supply and other fields. [0003] In order to reduce manufacturing costs, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M8/12H01M8/1004
CPCY02E60/521Y02E60/525Y02E60/50
Inventor 程谟杰张敏董永来
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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