Mixed conducting oxides YxZr1−x−yTiyO2−x/2 (YZT) and corresponding Ni/YZT cermets as anode materials in an SOFC
Mixed conducting oxides YxZr1−x−yTiyO2−x/2 (YZT) and corresponding Ni/YZT cermets as anode materials in an SOFC
复制标题
混合导电氧化物 YxZr1−x−yTiyO2−x/2 (YZT) 和相应的 Ni/YZT 金属陶瓷作为 SOFC 中的阳极材料
DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
P. Nikolopoulos
中科院分区：
文献类型：
--
作者：
X. Mantzouris;N. Zouvelou;V. Haanappel;F. Tietz;P. Nikolopoulos
本文介绍了Y2 O3-ZrO 2-TiO 2三元系混合导电氧化物的物理性质，并对其作为固体氧化物燃料电池（SOFC）阳极材料的应用进行了评价。具有立方萤石结构的陶瓷在空气中的总电导率主要取决于Ti含量，并且在900 °C下从y = 0到y = 0.15降低约一个数量级。比较在Ar/4%H2中在900 °C下的贡献的电导率，对于y = 0.15获得电子电导率的最高贡献。对于Ni/YZT金属陶瓷，与Ni/8 YSZ（8摩尔%氧化钇稳定的氧化锆）相比，在金属/陶瓷界面处增强的粘附性导致在还原气氛中在1，000 °C下退火1，000小时后在导电性和微观结构方面的更好的长期稳定性。在具有Ni/8 YSZ、Ni/Y0.20Zr0.75Ti0.05O1.9和Ni/Y0.20Zr0.70Ti0.10O1.9阳极的燃料电池中测试的电化学性能在蒸汽重整条件下对于Ni/Y0.20Zr0.70Ti0.10O1.9降低，最可能是由于该特定YZT陶瓷的降低的离子电导率。
The physical properties of mixed-conducting oxides in the ternary system Y2O3–ZrO2–TiO2 with the general formula YxZr1−x−yTiyO2−x/2 (YZT, where 0.133 < x < 0.25 and 0 < y < 0.15) are presented and evaluated in terms of an application as anode materials in solid oxide fuel cells (SOFCs). The total electrical conductivity of the ceramics with cubic fluorite structure in air mainly depends on the Ti content and decreases at 900 °C by about one order of magnitude from y = 0 to y = 0.15. Comparing the conductivity of contributions at 900 °C in Ar/4% H2 the highest contributions of electronic conductivity were obtained for y = 0.15. For the Ni/YZT cermets, the enhanced adherence at the metal/ceramic interface, compared to Ni/8YSZ (8 mol% yttria stabilised zirconia), results in a better long-term stability in terms of electrical conductivity and microstructure after 1,000 h of annealing at 1,000 °C in reducing atmosphere. The electrochemical performance, tested in fuel cells with Ni/8YSZ, Ni/Y0.20Zr0.75Ti0.05O1.9 and Ni/Y0.20Zr0.70Ti0.10O1.9 anodes, decreased for Ni/Y0.20Zr0.70Ti0.10O1.9 under steam reforming conditions, most likely due to the reduced ionic conductivity of this specific YZT ceramic.