Novel Ba _0.5Sr _0.5(Co _0.8Fe _0.2) _{1 - X}Ti _xO _{3 - δ} (x = 0, 0.05, and 0.1) cathode materials for proton-conducting solid oxide fuel cells

Ba _0.5Sr _0.5(Co _0.8Fe _0.2) _{1 - x}Ti _xO _{3 - δ} (x = 0, 0.05, and 0.1) materials were successfully prepared via an improved solid-state reaction route in an attempt to get better chemical stability for Ba _0.5Sr _0.5Co _0.8Fe _0.2O _{3 - δ} (BSCF). Stability tests showed that the novel Ti-doping strategy can effectively increase the chemical stability for Ba _0.5Sr _0.5Co _0.8Fe _0.2O _{3 - δ} in CO ₂- containing environments. The larger the Ti doping amount, the better the chemical stability. Ti-doped samples showed only a slight increase in area specific resistance (ASR) values, as shown from electrochemical tests performed on symmetrical cells. Therefore, anode-supported single fuel cells using BaZr _0.4Ce _0.4Y _0.2O _{3 - δ} (BZCY) as the electrolyte and BZCY-Ba _0.5Sr _0.5(Co _0.8Fe _0.2) _0.9Ti _0.1O _{3 - δ} as the composite cathode, were fabricated and tested. The measured maximum power density values were 181, 116, and 49 mW cm ^{- 2} at 700, 600, and 500 °C, respectively.