Suspension Plasma Spray and Performance Characterization of Half Cells with NiO/YSZ Anode and YSZ Electrolyte
Suspension Plasma Spray and Performance Characterization of Half Cells with NiO/YSZ Anode and YSZ Electrolyte
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DOI：
10.1007/s11666-011-9696-z
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发表时间：
2011
影响因子：
3.1
通讯作者：
Y. Wang;J. Legoux;Roberto Neagu;S. Hui;B. Marple
中科院分区：
文献类型：
--
作者：
Y. Wang;J. Legoux;Roberto Neagu;S. Hui;B. Marple
在悬浮等离子喷涂（SPS）中使用液体原料载体允许注入细粉末，从而提供生产既薄又密且具有精细微结构的喷涂涂层的可能性。这些特性使SPS成为固体氧化物燃料电池（SOFC）应用中沉积高效电极和电解质的有吸引力的工艺。在本研究中，利用SPS将nio - ytria稳定氧化锆（YSZ）阳极和YSZ电解质半电池成功地沉积在多孔Hastelloy X衬底上。通过实验设计对NiO-YSZ阳极沉积工艺进行了优化。采用一次改变一个参数的方法对YSZ电解液喷射过程进行了研究。实验设计结果表明，沉积涂层的孔隙率随悬浮进料速率的增大而增大，随等离子体总气体流量和离体距离的增大而减小。沉积速率随等离子体气体总流速、悬浮进给量和离体距离的增加而增加。SEM分析表明，NiO相和YSZ相分布均匀，YSZ相呈片层状结构。结果表明，随着等离子炬输入功率的增大，YSZ电解质层的密度增大。电化学表征表明，该电池在500℃时的开孔电压为0.989 V，在750℃时的峰值功率为0.610 W/cm2。
The use of a liquid feedstock carrier in suspension plasma spray (SPS) permits injection of fine powders, providing the possibility of producing sprayed coatings that are both thin and dense and have fine microstructures. These characteristics make SPS an attractive process for depositing highly efficient electrodes and electrolytes for solid oxide fuel cell (SOFC) applications. In this study, NiO-yttria stabilized zirconia (YSZ) anode and YSZ electrolyte half cells were successfully deposited on porous Hastelloy X substrates by SPS. The NiO-YSZ anode deposition process was optimized by design of experiment. The YSZ electrolyte spray process was examined by changing one parameter at a time. The results from the design-of-experiment trials indicated that the porosity of the as-deposited coatings increased with an increase of suspension feed rate while it decreased with an increase of total plasma gas flow rate and standoff distance. The deposition rate increased with an increase of total plasma gas flow rate, suspension feed rate, and standoff distance. The microstructure examination by SEM showed that the NiO and YSZ phases were homogeneously distributed and that the YSZ phase had a lamellar structure. It was observed that the density of the YSZ electrolyte layer increased as input power of the plasma torch increased. Electrochemical characterization of the fabricated cells indicated that an open cell voltage of 0.989 V at 500 °C and a peak power of 0.610 W/cm2at 750 °C were reached.