Chemically Stable Pr and Y Co-Doped Barium Zirconate Electrolytes with High Proton Conductivity for Intermediate-Temperature Solid Oxide Fuel Cells
Chemically Stable Pr and Y Co-Doped Barium Zirconate Electrolytes with High Proton Conductivity for Intermediate-Temperature Solid Oxide Fuel Cells
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DOI：
10.1002/adfm.201001540
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发表时间：
2011-01-07
影响因子：
19
通讯作者：
Traversa, Enrico
中科院分区：
文献类型：
--
作者：
Fabbri, Emiliana;Bi, Lei;Traversa, Enrico
通过用10mol%的Pr部分取代Y掺杂的锆酸钡（BZY）的Zr位，开发了一种化学稳定的高质子导电性电解质。与BZY相比，BaZr0.7Pr0.1Y0.2O3-delta（BZPY）具有更好的烧结性能。在1500 ℃下烧结8 h后获得致密样品。此外，BZPY在宽范围的燃料电池操作条件下显示出良好的化学稳定性。与BZY相比，更大的密度和增强的晶粒生长允许降低通常显示出高质子传输阻力的晶界的体积含量，因此，可以在实际应用感兴趣的温度范围内（在600 ℃下高于10（-2）Scm（-1））实现高质子传导率。BZPY电解质具有良好的可烧结性、化学稳定性和高电导率，能够通过简单且节省成本的共压制方法制造基于薄BZPY膜的单电池原型。在开路条件下的燃料电池测试期间进行的电化学阻抗谱（EIS）分析证实了BZPY作为电解质材料的良好电气性能。为了改善目前的燃料电池性能，需要开发适用于这种BZPY电解质的阴极材料。
A chemically stable and highly proton-conductive electrolyte is developed by partially substituting the Zr site of Y-doped barium zirconate (BZY) with 10 mol% of Pr. Compared to BZY, BaZr0.7Pr0.1Y0.2O3-delta (BZPY) shows improved sinterability as revealed by dilatometric measurements and scanning electron microscopy (SEM) analysis. Dense samples are obtained after sintering at 1500 degrees C for 8 h. Moreover, BZPY shows good chemical stability in the wide range of fuel-cell operating conditions. The larger density and the enhanced grain growth, compared to BZY, allow the volume content of grain boundaries, which generally show a high resistance for proton transport, to be reduced and, thus, a high proton conductivity can be achieved in the temperature range of interest for practical applications (above 10(-2) Scm(-1) at 600 degrees C). The good sinterability, chemical stability, and high conductivity of the BZPY electrolyte enabled the fabrication of single-cell prototypes based on a thin BZPY membrane by a simple and cost-saving co-pressing method. Electrochemical impedance spectroscopy (EIS) analysis performed during fuel-cell tests under open-circuit conditions confirms the good electrical performance of BZPY as electrolyte material. To improve the present fuel-cell performance adapted cathode materials for this BZPY electrolyte need to be developed.