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Composite cathode material of medium/low-temperature proton transport solid oxide fuel cell

A solid oxide, composite cathode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low ionic conductivity, limited three-phase interface, etc., achieve good sulfur poisoning, enhanced bonding strength, good carbon deposition phenomenon Effect

Inactive Publication Date: 2013-07-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

e.g. La 1-x Sr x MnO 3-δ (LSM), has high catalytic activity and good chemical stability, and its electronic conductivity is high (>100Scm -1 ), but its ionic conductivity is very low, only 5.9×10 at 900°C -7 Scm -1 , is a simple electronic conductor (I.Yasuda, K.Ogasawara, etal.SolidStateIonics86-88(1996):1197-1201)
The second type is a mixed conductor that conducts oxygen ions-electrons, such as perovskite La 1-x Sr x CoO 3-δ (LSC) (R.A. DeSouza, J.A. Kilner. Solid State Ionics 106(1998):175-187), Sm 1-x Sr x CoO 3-δ (SSC) (S.Kim, L.Y.Yang, etal.SolidStateIonics106(1998):189-195), this type of cathode material not only has high electronic conductivity, but also has high oxygen ion conductivity, making the conduction of oxygen ions relatively The first type of cathode material extends to the interior of the cathode material, while the three-phase interface reaction active area of ​​gas phase, ion phase and electronic phase extends to the entire electrolyte surface, which is conducive to improving the electrochemical reaction rate, but its proton conduction only reaches the electrolyte. The junction with the cathode material, so the three-phase interface is also very limited
At present, there are few studies on electrode materials with proton-conducting properties, and only a few of them are related to proton-conducting BaCeO 3 composite cathode material

Method used

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  • Composite cathode material of medium/low-temperature proton transport solid oxide fuel cell
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  • Composite cathode material of medium/low-temperature proton transport solid oxide fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Synthesis and chemical compatibility test of a composite cathode material with two phases each accounting for 50wt%

[0022] Press Nd 1.95 NiO 4+δ The stoichiometric ratio, weigh an appropriate amount of Nd 2 o 3 , the Nd 2 o 3 Dissolve in dilute nitric acid solution, then add Ni(NO 3 ) 2 ·6H 2 0, by metal ion: citric acid 1:1.5 ratio complexing agent monohydrate citric acid is added in the above-mentioned aqueous solution; Utilize magnetic stirrer to mix solution, 80 ℃ of water bath heatings remove unnecessary moisture, obtain gelatinous liquid; Put the gel-like liquid into a ceramic element dish, heat it on a resistance wire furnace until it is completely burned, and obtain an oxide precursor; the precursor is heat-treated at 1100°C for 6 hours to obtain a pure phase of Nd 1.95 NiO 4+δ Powder. Preparation of BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ , weigh an appropriate amount of Yb 2 o 3 , will Yb 2 o 3 Dissolve in concentrated nitric acid so...

Embodiment 2

[0024] Example 2: Test of interfacial resistance at different sintering temperatures of composite cathode materials with two phases each accounting for 50wt%

[0025] The composite cathode powder is obtained by mixing the synthesized two-phase cathode materials uniformly at a mass ratio of 1:1. A certain amount of composite cathode material powder and pore-forming agent soluble starch are uniformly mixed at a mass ratio of 8:2, and then a mixed solution of terpineol containing 10% ethyl cellulose is added to the uniformly mixed powder as Binder, the mass ratio of powder and binder is 6:4. The mixture was thoroughly ground until a uniform viscous cathode material slurry was obtained. Then the paste was uniformly coated on the dense BaZr by screen printing method 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ After the surface of the electrolyte sheet was dried in an oven, it was placed in a high-temperature furnace and calcined at 1150, 1200, and 1250°C for 3 hours to obtain a symmetrical...

Embodiment 3

[0027] Example 3: Testing of the polarization impedance of symmetrical batteries with different proportions of the two phases of the composite cathode

[0028] The synthesized two-phase cathode material BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ : Nd1.95 NiO 4+δ Mix evenly according to the mass ratio of 4:6, 5:5 and 6:4 to obtain composite cathode powder. A certain amount of composite cathode material powder and pore-forming agent soluble starch are uniformly mixed at a mass ratio of 8:2, and then terpineol containing 10% ethyl cellulose is added to the uniformly mixed powder as a binder , The mass ratio of powder to binder is 6:4. The mixture was thoroughly ground until a homogeneous viscous cathode material slurry was obtained. Then the paste was uniformly coated on the dense BaZr by screen printing method 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ After the surface of the electrolyte sheet is dried in an oven, it is placed in a high-temperature furnace and calcined at a temperature ...

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Abstract

The invention discloses a composite cathode material of a medium / low-temperature proton transport solid oxide fuel cell, belonging to the field of fuel cells. The composite cathode material disclosed by the invention is characterized in that the novel cathode material is obtained by mutual compounding of an oxygen ion-electron conductor phase with A-site deficiency, namely Nd1.95NiO4+delta and a proton conductor phase, namely BaZr0.1Ce0.7Y0.1Yb0.1O3-delta (BZCYYb), the chemical formula of the composite cathode material is Nd1. 95NiO4+delta-BaZr0.1Ce0.7Y0.1Yb0.1O3-delta, and the mixing weight ratio of the two phases is (3: 7)-(7: 3). The composite cathode material disclosed by the invention can be used for the medium / low-temperature proton transport solid oxide fuel cell, and the two phases in the composite material have good chemical compatibility. The compounding of the Nd1.95NiO4+delta and the BaZr0.1Ce0.7Y0.1Yb0.1O3-delta can ensure that the composite cathode material has oxygen ion, proton and electron conduction properties, the three-phase interface is expanded, and the electrochemical performances are good.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to an oxygen ion-electron conductor phase Nd 1.95 NiO 4+δ BaZr with proton conductor phase 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ A high-performance composite cathode material for proton transport solid oxide fuel cells formed by compounding each other. technical background [0002] As a new type of efficient clean energy conversion device, solid oxide fuel cell (SOFC) has attracted widespread attention due to its all-solid-state packaging structure, high conversion efficiency, strong fuel adaptability, and environmental friendliness. One of the green energy sources with development potential. However, the high operating temperature of traditional SOFC limits its commercial development, so the development of medium and low temperature SOFC has become the main trend of fuel cell development. [0003] SOFC is mainly divided into oxygen ion transport solid oxide fuel cell (O-SOFC) and proton t...

Claims

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Application Information

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IPC IPC(8): H01M4/86
CPCY02E60/50
Inventor 赵海雷张欣欣杨春阳张翠娟沈永娜
Owner UNIV OF SCI & TECH BEIJING
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