所有作者：林彬 王松林 刘杏芹 孟广耀
作者单位：中国科学技术大学材料科学与工程系
论文摘要：High-performance interconnect material chromium deficient lanthanum calcium chromites La０。７Ca０。３Cr０。９７O３-δ (LCC９７) perovskite oxide was prepared by a modified Pechini method and examined as novel cathode materials for solid oxide fuel cells (SOFCs) based on yttria-stabilized zirconia (YSZ) and samarium doped ceria (SDC) electrolytes at intermediate temperatures (６５０-８５０ °C)。 Chemical compatibility， sintering character， electrical conductivity and thermal expansion were investigated to characterize the compatibilities of La０。７Ca０。３Cr０。９７O３-δ (LCC９７) with Y０。１６Zr０。８４O２-δ (YSZ) and Sm０。２Ce０。８O２-δ (SDC)， respectively。 The electrochemical performance of the LCC９７ based composite cathode on the electrolyte of YSZ and SDC was studied by electrochemical impedance spectroscopy (EIS) for their potential utilization in the intermediate-temperature SOFCs。 The XRD analysis indicates LCC９７ chemically compatible with both YSZ and SDC。 There was no reaction between LCC９７ and YSZ/ SDC electrolytes even at a SOFC co-firing temperature (１４００ °C) in air。 The LCC９７ sintered at １２５０ °C had the conductivity of ６２。０ S。cm&#８７２２；１ at ８５０ °C in air， which is about ２。６ times as high as that of La０。７Ca０。３CrO３-δ with no chromium deficiency。 The TEC of the material was about １１。４×１０&#８７２２；６ K&#８７２２；１， which is very compatible to that of other common used SOFC components。 The interfacial polarization resistances (area specific resistances) of the LCC９７-SDC (１：１) composite cathode were much lower than the LCC９７-YSZ (１：１) composite cathode。 At ８００ °C， the ASRs of composite cathodes were only ０。１５ Ω。cm２ and ０。３０ Ω。cm２ for LCC９７-SDC (１：１) and LCC９７-YSZ (１：１)， respectively。
关键词： 固体氧化物燃料电池 阴极 连接材料 铬酸镧
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