LaGaO_3基固体氧化物燃料电池阳极材料Ce_(1-x)Tm_xO_(2-δ)(Tm=Cu,Mn,Fe)研究  

Anode Material for LaGaO_3-Based Solid Oxide Fuel Cell

作　　者：吕洪[1,2] 唐谊平[3] 胡克鳌[4] 

机构地区：[1]同济大学新能源汽车工程中心,上海201804 [2]同济大学汽车学院,上海201804 [3]浙江工业大学化学工程与材料学院,杭州310032 [4]上海交通大学金属基复合材料国家重点实验室,上海200030

出　　处：《中国稀土学报》2012年第4期457-464,共8页Journal of the Chinese Society of Rare Earths

基　　金：高等学校博士学科点专项科研基金(20090072120026);浙江省重中之重学科开发基金(20110923)资助

摘　　要：以研究与Sr,Mg掺杂LaGaO3(LSGM)电解质匹配的阳极材料为出发点,系统研究了Ce1-xTmxO2-δ(Tm=Cu,Mn,Fe)固溶体的晶体结构、热化学稳定性、电化学性能和单电池发电实验。柠檬酸法合成的Ce1-xTmxO2-δ化合物在x<0.2时均为单相材料,与LSGM电解质有良好的热化学相容性。采用交流阻抗法研究了阳极材料的电化学性能,金属元素掺杂可以显著地改善CeO2电化学性能,Fe元素掺杂阳极材料极化电阻最小,随着元素掺杂量的增加以及氢气增湿,极化电阻减小。采用电解质支撑结构单电池进行发电实验,在800℃时,以Ce0.8Fe0.2O2-δ作为阳极的单电池最高功率密度可达98 mW.cm-2,表明该材料作为IT-SOFC的阳极材料具有一定的可行性,有望成为适合LSGM电解质的阳极材料。This paper focused on the anode material suited for Sr/Mg doping LaGaO3（LSGM） electrolyte.Crystal structure,thermal compatibility with electrolyte and anodic polarization of compositions in the system Ce1-xTmxO2-δ（Tm=Cu,Mn,Fe） with 0≤x≤0.2 were studied.A series of Ce1-xTmxO2-δ catalysts were prepared by the citrate method.The homogeneous cubic ceria-like solid solutions could be obtained through doped-ceria with low doped amount and exhibited good thermal chemical compatibility with LSGM in air.The electrochemical behavior of anode was analyzed by electrochemical impedance spectroscopy.The transition element doping CeO2 improved the electrochemical oxidation of hydrogen,and doping Fe showed the best electrochemical performance.The polarization resistance decreased with increasing element-doped content while the lower polarization resistances appeared in humidified H2 than in dry H2.An electrolyte supported cell was prepared to assess Ce0.8Fe0.2O2-δ anode performance of running on humidified H2.A maximum power density of single cell was 98 mW · cm-2 at 800 ℃.Therefore,Ce1-xFexO2-δ will be a promising candidate for IT-SOFC anode material.

关 键 词：固体氧化物燃料电池 阳极 掺杂CeO2 极化电阻 稀土 

分 类 号：TM911.4[电气工程—电力电子与电力传动]