Electrophoretic deposition of dense BaCe_(0.9)Y_(0.1)O_(3_x) electrolyte thick-films on Ni-based anodes for intermediate temperature solid oxide fuel cells

摘要

Proton conducting BaCe_(0.9)Y_(0.1)O_(3-x) (BCY10) thick films are deposited on cermet anodes made of nickel-yttrium doped barium cerate using electrophoretic deposition (EPD) technique. BCY10 powders are prepared by the citrate-nitrate auto-combustion method and the cermet anodes are prepared by the evaporation and decomposition solution and suspension method. The EPD parameters are optimized and the deposition time is varied between 1 and 5 min to obtain films with different thicknesses. The anode substrates and electrolyte films are co-sintered at 1550 ℃ for 2 h to obtain a dense electrolyte film keeping a suitable porosity in the anode, with a single heating treatment. The samples are characterized by field emission scanning electron microscopy (FE-SEM) and energy dispersion spectroscopy (EDS). A prototype fuel cell is prepared depositing a composite La_(0.8)Sr_(0.2)Co_(0.8)Fe_(0.2)O_3 (LSCF)-BaCe_(0.9)Yb_(0.1)O_(3-δ) (10YbBC) cathode on the co-sintered half cell. Fuel cell tests that are performed at 650 ℃ on the prototype single cells show a maximum power density of 174mWcm~(-2).