纳米YSZ包裹NiO对固体氧化物燃料电池阳极性能的影响

Influence of Nano-YSZ Coated NiO on Anode Performance for Solid Oxide Fuel Cell

利用沉淀法制备纳米YSZ包裹的Nio粉体，将其和8YSZ及PMMA按一定质量比混合，采用水系流延技术经1400℃烧成制成阳极支撑型阳极，采用丝网印刷技术印刷4LSM＋SSZ复合阴极，在1200℃下煅烧2h得到单电池。以X射线衍射仪、透射电镜、电子扫描电镜、阿基米德排水法、压汞法和电化学工作站等测试手段分别对包裹粉体的物相、显微结构及单电池的显微结构和电化学性能等进行了表征。结果表明，沉淀法制备的20～50nm立方相YSZ颗粒能够有效地附着在NiO颗粒上，通过这种方式构建的多孔网络结构的阳极，大大的增加了三相界面的长度，有利于燃料气H2的扩散，降低电池的浓差极化。以H2＋5％水蒸气为燃料气，空气为氧化气，在750℃ 2wt%纳米YSZ包裹NiO的单电池的最大功率密度为1．02w／d，欧姆电阻为0．19Ωcm^2，极化电阻0．38Ωcm^2。

A powder of nano-YSZ coated NiO was prepared by precipitation method, the single cell via aqueous tape casting of anode for nano-YSZ coated NiO, 8YSZ and PMMA at 1400℃ sintering temperature and screen printing the LSM＋SSZ complex cathode at 1200 ℃ for 2 h was fabricated. The crystalline phase, microstructure of powder and the microstructure, electrochemical performances of the single cell were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, the archimedes methode, mercury porosimetery and electrochemical workstation, respectively. The YSZ powder with cubic phase and the particle size about 20-30 nm by precipitation method was sticked on the nickel oxide, porous network structure anode was formed to increase largely the length of triple phase boundries, be fenefit of diffusion of fuel gas H2 and reduce concentration polarization of single cell. The maximum power density of single cell with 2 wt% nano-YSZ coated NiO is 1.02 W/cm^2, the ohmic resistance is 0.19 Ωcm^2 and the polarization resistance is 0.38 Ωcm^2 with H2＋3%H2O as anode gas and air as cathode gas are used at 750 ℃ .