Promoted CO2-poisoning resistance of La0.8Sr0.2MnO3−δ-coated Ba0.5Sr0.5Co0.8Fe0.2O3−δ cathode for intermediate temperature solid oxide fuel cells

The solution impregnation technology was used to prepare a novel core-shell structure cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). The core was composed of porous Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ (BSCF) backbone with high oxygen conductivity, while the dense shell consisted of La 0.8 Sr 0.2 MnO 3−δ (LSM) high catalytic activity and the excellent CO 2 -poisoning resistance. The presence of the dense LSM shell prevented the BSCF cathode from being poisoned by CO 2 , and improved its electrochemical performance. The best performance was achieved when the BSCF cathode was impregnated twice in the LSM precursor solution and coated by LSM shell.