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固体氧化物燃料电池的Ni-Co和Ni-Fe合金基阳极的制备与性能

发表时间:2009-06-30  浏览量:1826  下载量:739
全部作者: 郎莹,谢贞,彭冉冉,夏长荣
作者单位: 景德镇陶瓷学院,国家日用及建筑陶瓷工程技术研究中心;中国科学技术大学化学与材料科学学院
摘 要: 对Ni0.5Co0.5-SDC和Ni0.5Fe0.5-SDC合金基复合阳极的制备及电化学性能进行了研究及评价,并对其电化学反应机理进行了初步探索。Co,Fe的加入对传统Ni基阳极性能有较大影响,在600℃下,Ni0.5Co0.5-SDC支撑单电池的最大输出功率为616 mWcm-2,优于以Ni-SDC为电极时的最大输出功率(540 mWcm-2);而以Ni0.5Fe0.5-SDC为阳极的电池性能最低,仅为380 mWcm-2.以Ni0.5Co0.5-SDC为阳极,600℃开路条件下电池的界面极化电阻仅为0.121 Ω/cm2,而以Ni0.5Fe0.5-SDC为电极时,相同条件下的界面极化电阻为0.238 Ω/cm2.通过X射线衍射(X-ray diffraction, XRD)研究发现:1 200℃烧结后镍钴复合氧化物为面心立方的CoNiO2固溶体,而镍铁复合氧化物形成NiO和NiFe2O4复合氧化物。镍钴、镍铁复合氧化物在相结构上的差异可能是导致还原后2种合金基复合阳极在性能上有较大差异的原因之一。
关 键 词: 无机非金属材料;低温固体氧化物燃料电池;共压-共烧;Ni-Co;Ni-Fe;合金基阳极
Title: Preparation and characterization of Ni-Co and Ni-Fe alloy based anodes for low-temperature solid oxide fuel cells
Author: LANG Ying, XIE Zhen, PENG Ranran, XIA Changrong
Organization: National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen Ceramic Institute;The College of Chemistry and Material Science, University of Science and Technology of China
Abstract: Ni0.5Co0.5 and Ni0.5Fe0.5 alloys were investigated as anodes for low-temperature solid oxide fuel cells (LT-SOFCs). The alloys were formed by in situ reduction of Ni0.5Fe0.5Oy and Ni0.5Co0.5Oy composites, which were synthesized using a glycine-nitrate technique. Ni0.5Co0.5-SDC (Ce0.8Sm0.2O1.9) and Ni0.5Fe0.5-SDC supported single cells were prepared using a co-pressing and co-firing process. Interfacial polarization resistances and I-U curves of these cells were measured at 600℃. With Ni0.5Co0.5-SDC as anode, the maximum power density of the cell was about 616 mWcm-2 when humidified (3% H2O) hydrogen was used as fuel and stationary air as oxidant, while Ni0.5Fe0.5-SDC as anode, the maximum power density was only 380 mWcm-2. The interfacial resistances of the two cells were 0.121 and 0.238 Ω/cm2, respectively, which accounted for big difference in power density. X-ray diffraction (XRD) was used to identify the phase of Ni0.5Fe0.5Oy and Ni0.5Co0.5Oy composites sintered at 1 200℃. It was shown that the Ni0.5Fe0.5Oy consisted of NiO and NiFe2O4 composites, while Ni0.5Co0.5Oy only formed CoNiO2. The difference in the consistent of the two composites might account for the distinctness in the microstructure and then the electrochemical performance of the corresponding alloys. Alloy based cermets might be promising anodes for SOFCs.
Key words: inorganic nonmetallic materials; low-temperature solid oxide fuel cells (LT-SOFCs); co-pressing and co-firing; Ni-Co; Ni-Fe; alloy based anodes
发表期数: 2009年6月第12期
引用格式: 郎莹,谢贞,彭冉冉,等. 固体氧化物燃料电池的Ni-Co和Ni-Fe合金基阳极的制备与性能[J]. 中国科技论文在线精品论文,2009,2(12):1234-1238.
 
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