新型SOFC阳极材料La_(0.75)Sr_(0.25)Mn_(0.5)Cr_(0.5-x)Cu_xO_(3-δ)的合成与表征  

Synthesis and Characterization of La_(0.75)Sr_(0.25)Mn_(0.5)Cr_(0.5-x)Cu_xO_(3-δ) for SOFC Anode Material

作　　者：孙琳[1] 卢军[1] 殷洁炜[1] 尹屹梅[1] 马紫峰[1] 

机构地区：[1]上海交通大学化学化工学院,上海200240

出　　处：《无机材料学报》2013年第9期925-930,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(21173147);上海市自然科学基金(09ZR1413900)~~

摘　　要：合成了新型固体氧化物燃料电池(SOFC)阳极材料La0.75Sr0.25Mn0.5Cr0.5-x Cux O3-δ(LSMCr0.5-x Cux,x=0、0.05、0.10、0.20)。通过X射线衍射(XRD)表征其物相结构和与电解质的化学相容性,通过透射电子显微镜(TEM)表征其微观形貌。用直流四探针法测试了材料的电导率;交流阻抗法表征了材料的阳极阻抗特性。结果表明:LSMCr0.5-x Cux材料均为菱方钙钛矿晶相,Cu的掺入导致晶胞体积和粉体粒径增大。x≤0.10时,阳极粉体与YSZ在1200℃烧结3 h无第三相生成,具有良好的化学相容性。LSMCr0.5-x Cux在空气和5%H2-Ar气氛下的电导率均随x的增加而增大;在湿润的5%H2-Ar气氛下的阳极极化面电阻(ASR)均低于未掺杂的LSCM,x=0.05时ASR最低,900℃时仅有0.38·cm2。New perovskite oxides La0.75Sr0.25Mn0.5Cr0.5-xCuxO3-δ （LSMCr0.5-xCux, x=0, 0.05, 0.10, 0.20） were developed as anode materials for solid oxide fuel cells （SOFC）. Phase analysis, chemical compatibility with YSZ electrolyte and microstructure of LSMCr0.5-xCux were characterized by X-Ray diffusion （XRD） and transmission electron microscope （TEM）, respectively. The total conductivities of LSMCr0.5-xCux in different atmospheres were measured by four-terminal DC method, and the AC electrochemical impedance spectra measurements were carried out using symmetrical cell method. The as-prepared LSMCr0.5-xCux powders are pure rhombohedral perovskite phase confirmed by XRD, and the size of particles increase with increasing Cu content. No third impurity phase is observed when LSMCr0.5-xCux（x=0, 0.05, 0.10） and YSZ are heat-treated in air at 1200 ℃ for 3 h, indicating good chemical compatibility between the anode materials and YSZ electrolyte. The total conductivity of doped materials increases remarkably with increasing Cu content in air and in 5% H2-Ar atmosphere. In addition, the impedance spectra show that the ASR （anode surface resistance） value of LSMCr0.5-x Cx in wet 5% H2-Ar atmosphere is lower than that of undoped LSCM and reaches the minimum value （0.38 Ω.cm2） at 900 ℃ when x is 0.05.

关 键 词：固体氧化物燃料电池 阳极 LSCM CU掺杂 电导率 阻抗 

分 类 号：TM911[电气工程—电力电子与电力传动]