燃料电池多孔陶瓷电极薄层的喷墨打印制造

Fabrication of Porous Fuel Cell Electrode Layers via Inkjet Printing

通过研发水基镧锶钴铁氧体(LSCF)陶瓷墨水,制造喷墨打印固体氧化物燃料电池(SOFC)阴极薄层,通过粒径电位仪、流变仪、X射线衍射仪、扫描电子显微镜等对墨水和打印干燥烧结制得的薄层进行表征。结果表明:通过研磨细化,粉体平均粒径由数微米减少为100 nm;以此配制了具有优异分散稳定性的水基LSCF墨水;通过优化打印电压波形有效解决了卫星液滴及铺展不均问题;通过减少打印层数和延长层间打印间隔时间制备了表面形貌较好的多孔阴极薄层,可满足SOFC的使用需求。

Solid oxide fuel cell(SOFC) cathode thin layers were fabricated via inkjet printing with a novel water-based lanthanum cobalt strontium ferrite(LSCF) ceramic ink. The prepared inks and thin cathode layers after printing, drying and sintering were characterized by particle size and zeta potential measurements, surface tensiometry, rheometry, X-ray diffraction and scanning electron microscopy. The results show that a fine particle size is obtained by wet grinding, and the average particle size is reduced from a few micronmeters to approximately 100 nm. Water-based LSCF inks with superior rheological properties and dispersion stability were prepared with the nanoparticles. The problem of satellite droplets during printing and uneven distribution of the jetted droplets on the substrate were effectively solved by optimizing the voltage waveforms of printing parameters, thus greatly improving the quality of droplet injection and distribution. Thin cathode layers with a good surface morphology and a porous microstructure suitable for SOFC applications could be prepared by reducing the number of printing layers and extending the printing time interval between layers.