(Invited) Enhancing Phase Stability and CO2 Tolerance of Ba0.5Sr0.5Co0.8Fe0.2O3-δ
(Invited) Enhancing Phase Stability and CO2 Tolerance of Ba0.5Sr0.5Co0.8Fe0.2O3-δ
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（特邀）增强Ba0 5Sr0 5Co0 8Fe0 2O3-δ的相稳定性和CO2耐受性
DOI：
10.1149/08009.0013ecst
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
D. Gerthsen
中科院分区：
文献类型：
--
作者：
E. Ivers-Tiffée;L. Almar;J. Szász;M. Meffert;H. Störmer;D. Gerthsen
研究了B位阳离子取代对Ba 0。5Sr0. 5Co0。8Fe0. 2 O_3-δ（BSCF）在含O_2和CO_2的大气中已被本课题组深入研究。特别地，发现10摩尔%钇（Y）的掺杂浓度强烈地减少或抑制第二相形成，从而扩展立方相区域的稳定性。通过电化学阻抗谱（EIS）的两个，纯的和Y-掺杂的BSCF电极的表征，在氧-氮混合物中以及在含CO2的气氛中使用对称的SOFC电池与Ce 0。9Gd0。1 O_2-δ（CGO）作为电解质，在600 ~ 900 ℃的温度范围内进行电解。结合弛豫时间（DRT）的分布的EIS数据的分析揭示了Y掺杂的BSCF阴极对CO2分子的吸附的增强的耐受性。通过扫描电子显微镜（SEM）和分析（扫描）透射电子显微镜（（S）TEM）结合能量色散X射线光谱（EDXS）进一步证实了立方相的增强的稳定性和通过掺杂降低的对含CO2气氛中的氧还原反应的中毒效应。
The effect of B-site cation substitution on the phase stability of Ba0. 5Sr0. 5Co0. 8Fe0. 2O3-δ (BSCF) in O2-and CO2-containing atmospheres has been studied thoroughly by our group. In particular, a doping concentration of 10 mol-% yttrium (Y) was found to strongly reduce or suppress secondary phase formation extending the stability of the cubic phase regime. Characterization by electrochemical impedance spectroscopy (EIS) of both, pure and Y-doped BSCF electrodes, is performed in oxygen-nitrogen mixtures as well as in CO2-containing atmospheres using symmetrical SOFC cells with Ce0. 9Gd0. 1O2-δ (CGO) as electrolyte from 600 to 900 C. Analysis of the EIS data in combination with the distribution of relaxation times (DRT) reveals an enhanced tolerance of the Y-doped BSCF cathodes towards the adsorption of CO2 molecules. The enhanced stability of the cubic phase and reduced poisoning effect on the oxygen reduction reaction in CO2-containing atmospheres by doping, is further confirmed by scanning electron microscopy (SEM) and analytical (scanning) transmission electron microscopy ((S) TEM) combined with energy dispersive X-ray spectroscopy (EDXS).