Development of Ceria Based SOFCs With a High Performance La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)-Ce_(0.9)Gd_(0.1)O_(1.95)-Ag Composite Cathode

摘要

In this work, a microtubular cell consisting of a thin Ce_(0.9)Gd_(0.1)O_(1.95) (GDC) electrolyte (thickness: below 10μm) on a support NiO/GDC anode (1.8 mm outer diameter, 200 μm wall thickness) with a La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)/GDC functional cathode has been developed for intermediate/low temperature operation. The functional cathode was prepared by in situ infiltrating the electrochemically catalytic nano-Ag particles into the as-established 20 μm thick cathode. The as-proposed Ag-impregnation route ensures a very homogeneous particle dispersion and a good adhesion of Ag to the ceramic matrices. The cells were successfully operated to produce the maximum power densities of 0.41 W cm~(-2) (1.27 A cm~(-2), 0.32 V), 0.83 W cm~(-2) (2.23 A cm~(-2), 0.37 V), and 1.05 W cm~(-2) (2.39 A cm~(-2), 0.44 V) at 450℃, 500℃, and 550℃, respectively.