Controlled fabrication of anode microstructures in solid oxide fuel cells

传统固体氧化物燃料电池阳极的微观结构由于其路径是随机分布的，没有必要从物质转移或边界化学反应的角度进行优化。在本研究中，我们的目标是YSZ、Ni和孔沿厚度方向排列，氧离子、电子和气体分别在其中有效传递。在磁场作用下，镍颗粒排列整齐，最大功率提高到传统电池的1.6倍。通过FIB-SEM和电化学反应计算对微观结构进行了重建，结果表明弯曲度由7提高到3左右。在Zr衬底上沉积Al膜，通过阳极氧化形成纳米孔的氧化铝，再以纳米孔为模具进行再阳极氧化制备氧化锆柱。

Conventional microstructures in anode of solid-oxide fuel cells has not been necessarily optimized in a view point of the transfer of matters or chemical reactions at their boundaries because the paths are located randomly. In this study, we aimed for alignment of YSZ, Ni and pore along the thickness direction, in which the oxygen ions, electrons and gases are effectively transferred respectively. Ni particles were aligned by magnetic field and the maximum power improved to 1.6 times as the conventional cell. The reconstruction of the microstructure with FIB-SEM and electrochemical reaction calculation indicated that the tortuosity was improved to about 3 from 7. Furthermore, Al film was deposited on a Zr substrate and alumina through nanoholes were formed by anodic oxidation, and then the zirconia pillars were successfully synthesized by reanodization using the nanoholes as a mold.