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A method for suppressing interfacial reaction between cathode and electrolyte of high temperature fuel cell

A high-temperature fuel cell and interface reaction technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as poor compatibility, and achieve the effect of reducing complexity and cost of battery preparation

Active Publication Date: 2018-12-07
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

[0005] The purpose of the present invention is to overcome the problem of poor chemical compatibility between commonly used perovskite-type composite oxide cathodes and YSZ-based electrolytes, and the formation of high-resistance reaction products at the interface at high temperatures, and to provide a method for inhibiting solid oxide fuel cell cathodes and electrolytes. method of interfacial reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] La 0.6 Sr 0.4 CoO 3 -1wt%TiO 2 The composite cathode is directly applied to the YSZ electrolyte surface. With NiO-YSZ (YSZ is 8mol% Y 2 o 3 Stable ZrO 2 , the mass ratio of NiO to YSZ is 1:1) as the anode, YSZ as the electrolyte, La 0.6 Sr 0.4 COO3 -1wt%TiO 2 The composite material is used as a cathode, and a membrane electrode of an anode-supported solid oxide fuel cell is prepared. Among them, La 0.6 Sr 0.4 COO 3-δ (0.495g) with TiO 2 (0.005g) was mixed well, and an appropriate amount of binder (n-butanol, 0.5g) was added to prepare a cathode slurry, and the cathode slurry (0.012g) was coated on the surface of the YSZ electrolyte, and baked at 850°C for 2h. Composite cathode area is 0.5cm 2 .

[0025] On the anode side, humidified hydrogen is used as fuel (volume concentration 3% H 2 O, 100ml min -1 ), on the cathode side, oxygen as oxidant (100ml min -1 ). At 700°C, the current density of the battery at 0.8V is 0.5A cm -2 .

Embodiment 2

[0027] Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3 -0.2wt%CeO 2 The composite cathode is directly applied to the YSZ electrolyte surface. With NiO-YSZ (YSZ is 8mol% Y 2 o 3 Stable ZrO 2 , the mass ratio of NiO to YSZ is 1:1) as the anode, YSZ as the electrolyte, Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3 -0.2wt%CeO 2 The composite material is used as a cathode, and a membrane electrode of an anode-supported solid oxide fuel cell is prepared. Among them, Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3 (0.998g) with TiO 2 (0.002g) was mixed well, and an appropriate amount of binder (n-butanol, 1g) was added to prepare a cathode slurry, and the cathode slurry (0.012g) was coated on the surface of the YSZ electrolyte, and baked at 800°C for 2h. Composite cathode area is 0.5cm 2 .

[0028] On the anode side, humidified hydrogen is used as fuel (volume concentration 3% H 2 O, 100mlmin -1 ), on the cathode side, oxygen as oxidant (100ml min -1 ). At 700°C, the current density of the battery at 0....

Embodiment 3

[0030] La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3 -5wt%CeO 2 The composite cathode is directly applied to the YSZ electrolyte surface. With NiO-YSZ (YSZ is 8mol% Y 2 o 3 Stable ZrO 2 , the mass ratio of NiO to YSZ is 1:1) as the anode, YSZ as the electrolyte, La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3 -5wt%CeO 2 The composite material is used as a cathode, and a membrane electrode of an anode-supported solid oxide fuel cell is prepared. Among them, La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3 (0.475g) with TiO 2 (0.025g) was mixed well, and an appropriate amount of binder (n-butanol, 0.5g) was added to prepare a cathode slurry, and the cathode slurry (0.012g) was coated on the surface of the YSZ electrolyte, and baked at 900°C for 2h. Composite cathode area is 0.5cm 2 .

[0031] On the anode side, humidified hydrogen is used as fuel (volume concentration 3% H 2 O, 100mlmin -1 ), on the cathode side, oxygen as oxidant (100ml min -1 ). At 700°C, the current density of the battery at 0.8V...

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Abstract

The invention discloses a method for inhibiting the interface reaction between the cathode and the electrolyte of a solid oxide fuel cell. Composite cathode, the composite cathode is directly sintered on the surface of the electrolyte, and the MO2 oxide is easily reacted with the perovskite oxide to form a reaction product that has no harmful effect on oxygen reduction, thereby inhibiting the reaction between the perovskite oxide and the electrolyte in the composite cathode And the formation of low conductivity phase, improve battery performance. The invention can effectively inhibit the interfacial reaction between the perovskite composite oxide cathode and the zirconia-based electrolyte, and directly apply the high-performance perovskite composite oxide cathode material to the zirconia-based electrolyte without preparation on the surface of the electrolyte The cerium oxide-based interlayer reduces the complexity of the battery preparation process and lowers the cost of battery preparation.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for suppressing the interface reaction between a high-temperature fuel cell cathode and an electrolyte. Background technique [0002] Solid oxide fuel cell (Solid Oxide Fuel Cell, referred to as SOFC) can convert the chemical energy of fuel into electrical energy through electrochemical reaction at high temperature. It has the characteristics of flexible fuel, high power generation efficiency, and environmental friendliness. It is a very advanced Energy conversion technology. [0003] The SOFC membrane electrode has a "sandwich" structure, with a dense electrolyte membrane in the middle layer, and porous anode and cathode on both sides. Perovskite composite oxides with ABO 3 It is a common cathode material for solid oxide fuel cells. Wherein, the A site is a rare earth or alkaline earth element, and the B site is a transition metal element. Strontium doped lanthanum mangani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1213H01M8/1253
CPCY02E60/50
Inventor 程谟杰刘伟星赵哲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI