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Preparation, Structure and Properties of La2NiO4+δ-La0.6Sr0.4Co0.2Fe0.8O3-δ Composite Cathode Materials

Author: ShiHai
Tutor: XuQing
School: Wuhan University of Technology
Course: Materials Science
Keywords: The La2NiO4 δ-La0.6Sr0.4Co0.2Fe0.8O3-δ complex system of cathode Chemical compatibility Mixed conductive properties Thermal expansion properties
CLC: O614.331
Type: Master's thesis
Year: 2008
Downloads: 102
Quote: 0
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Abstract


The la 2 NiO δ and La , 0.6 Sr 0.4 the Co. 0.2 < / sub> Fe 0.8 O 3-δ with electron - ion hybrid conductive characteristics intermediate temperature solid oxide fuel cell (SOFC) cathode candidate materials. In this thesis La 2 NiO 4 δ and La 0.6 Sr 0.4 Co 0 .2 Fe 0.8 O 3-δ component, design and preparation of the (100-x) wt. % La 2 NiO 4 δ xwt. % La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 -δ (x = 10-60) composite system cathode material to study the sintering temperature and composition on the the cathode material structure and performance of the composite system, its aims for the development of a new cathode material with excellent overall performance to provide the scientific basis. This paper examines the composite system of material in the two groups at high temperatures, chemical compatibility. The XRD results show that the diffraction peaks of the composite system of ceramic samples were attributed to the La 2 NiO 4 δ component and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ component of the diffraction peak, indicating composite cathode two groups per La 2 NiO δ and La , 0.6 Sr 0.4 Co 0.2 the of Fe 0.8 O 3-δ at high temperatures with or without obvious chemical reactions, has good chemical compatibility. In this thesis, the sintering temperature of La 2 NiO the the four δ -La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ composite system ceramic structure and conductive properties. The research results show that the appropriate sintering temperature can significantly improve the microstructure and electrical properties of the ceramic. Determined in accordance with the conductive performance test results, x = 60 composite system ceramic samples suitable sintering temperature of 1400 ° C, the suitable sintering temperature of 1450 ° C in the other composite system consisting of a ceramic sample. This paper studies the composition on the La 2 of NiO δ-La 0.6 Sr 0.4 Co < sub> 0.2 Fe , 0.8 O 3-δ composite system ceramic structure and performance. The research results show that with the composite system of ceramic La 0.6 Sr , Co. , 0.4 0.2 Fe 0.8 < / sub> O 3-δ element of the increase in the relative content, the total electrical conductivity of the ceramic composite system improved, lower oxygen ion conductivity, thermal expansion coefficient increases. X = 30 the composition is determined according to the results of the electrical conductivity and thermal expansion properties for the optimal composition of the cathode material of the composite system. In the temperature range of 600 ℃ -800 ℃ its total electrical conductivity is maintained at more than 100 S · cm -1 ; 100 ℃ -730 ℃ temperature range, its average thermal expansion coefficient of 14.4 × 10 -6 K -1 . On the conductive properties and thermal expansion properties of the composition to meet the performance requirements of the temperature SOFC cathode material.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section III group metal elements and their compounds > Lanthanides ( rare earth elements ) > Lanthanum La
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