Preparation and characterization of YDC-BCFN as nanocoating on the cathode of IT-SOFC
Preparation and characterization of YDC-BCFN as nanocoating on the cathode of IT-SOFC
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DOI：
10.1016/j.surfcoat.2016.08.037
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发表时间：
2016-11
影响因子：
5.4
通讯作者：
Weijian Song;Chencen Sun;Taihe Wang;Rong-Bing Li;Q. Zhen
中科院分区：
文献类型：
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作者：
Weijian Song;Chencen Sun;Taihe Wang;Rong-Bing Li;Q. Zhen
以金属硝酸盐、Nb 2 O 5、柠檬酸和乙二胺四乙酸（EDTA）为原料，采用EDTA-柠檬酸络合法成功制备了Ba1.0Co0.7Fe0.2Nb0.1O3−δ（BCFN）纳米粉体。采用TG/DSC、FTIR、XRD、TEM和选区电子衍射（SAED）等技术对前驱体和纳米粉体的合成过程、热分解行为、物相变化和微观形貌进行了表征。在950 °C下可以获得立方钙钛矿型结构的BCFN纳米粉末，其平均晶粒尺寸为约60 nm。采用O2程序升温脱附（O2-TPD）和H2程序升温还原（H2-TPR）研究了其氧化还原性能。BCFN纳米粉体在较低温度下具有比微米粉体更好的氧还原能力。BCFN纳米粉和微米粉分别与Ce0.8Y0.2O2-δ（YDC）纳米粉以1：1的质量比混合。将混合粉末涂覆在BCFN-Ce 0. 8 Gd 0. 2 O2 − δ（GDC）复合阴极上，以降低其极化电阻。结果表明，BCFN-YDC纳米涂层的BCFN-GDC/GDC/BCFN-GDC对称电池的极化电阻低于微米涂层或未涂层的电池。
Using metal nitrates, Nb2O5, citric acid and Ethylenediamine Tetraacetic Acid (EDTA) as raw materials, Ba1.0Co0.7Fe0.2Nb0.1O3−δ(BCFN) nanopowders were successfully prepared by an EDTA-citric acid complex method. The synthesis process, thermal decomposition behavior, phase variation and micro-morphology of the precursor and obtained nanopowders were characterized by TG/DSC, FTIR, XRD and TEM combined with selected area electron diffraction (SAED) techniques. The cubic perovskite-type structure BCFN nanopowders could be obtained at 950 °C with an average crystallite size of ~ 60 nm. The redox performance was studied using O2temperature programmed desorption (O2-TPD) and H2temperature programmed reduction (H2–TPR). BCFN nanopowders exhibited better oxygen reduction ability than micron powders at lower temperature. Both BCFN nanopowders and micron powders were mixed with Ce0.8Y0.2O2 − δ(YDC) nanopowders with mass ratio of 1:1, respectively. The mixed powders were coated on a BCFN-Ce0.8Gd0.2O2 − δ(GDC) composite cathode in order to lower its polarization resistance. The results showed that the BCFN-GDC/GDC/BCFN-GDC symmetric cell with BCFN-YDC nanocoating exhibited lower polarization resistance compared to samples with BCFN-YDC micron size coating or without coating.