Nanostructured cathode thin films with vertically-aligned nanopores for thin film SOFC and their characteristics

J. YOON; R. ARAUJO; N. GRUNBAUM; L. BAQUE; A. SERQUIS; A. CANEIRO; X. ZHANG; H. WANG

APPLIED SURFACE SCIENCE

ELSEVIER SCIENCE BV

Año: 2007 vol. 254 p. 266 - 269

0169-4332

Nanostructured cathode thin films with vertically-aligned nanopores (VANP) were processed using a pulsed laser deposition technique (PLD).These VANP structures enhance the oxygen-gas phase diffusivity, thus improve the overall thin film SOFC performance. La0.5Sr0.5CoO3 (LSCO)and La0.4Sr0.6Co0.8Fe0.2O3 (LSCFO) were deposited on various substrates (YSZ, Si and pressed Ce0.9Gd0.1O1.95 disks). Microstructures andproperties of the nanostructured cathodes were characterized by TEM, HRTEM, SEM and electrochemical measurements. Additionally these wellalignedVANP structures relieve or partially relieve the internal thermal stress and lattice strain caused by the differences of thermal expansioncoefficients and lattice mismatch between the electrode and the electrolyte.