부산대학교 도서관

This paper describes a new method for improving the performance of oxide anodes by precipitating metal nano- clusters on oxide surfaces during the initial stages of SOFC operation, without additional processing steps. Transmission electron microscope and x-ray photoelectron spectroscopy observations showed that nano-clusters of Ni or Ru metal precipitated onto lanthanum chromite (La0.8Sr0.2Cr1-yXyO3-d, X = Ni, Ru) surfaces, respectively, after exposure to hydrogen at 800{degree sign}C. While Ni nano-clusters coarsened over ~300 h at 800{degree sign} C, Ru nano-cluster size was stable at <= 5 nm. SOFC tests were done with the doped lanthanum chromite anodes on LSGM electrolyte-supported cells. Ru and Ni nano-cluster nucleation improved cell performance and reduced anode polarization resistance during the first 50-100 h of cell operation.