Characterization of La0.5Ba0.5CoO3 − δ as a SOFC Cathode Material

摘要: This study reports the physical properties and electrochemical behavior of La 0.5 Ba CoO 3-δ (LBC), a perovskite material potential candidate for solid oxide fuel cell (SOFC) cathode. LBC was synthesized by solid-state route, phase purity checked X-ray diffraction measurement. Thermogravimetric analysis performed both in air argon atmosphere to observe its stability. Total conductivity, measured four-point dc polarization method, exhibited pseudometallic-type behavior. Ionic conductivity determined over 650-775°C temperature range technique using electron-blocking electrodes. The high total combined with sufficiently ionic (1.2 × 10 -3 S/cm at 650°C), indicates that possesses certain degree mixed ionic-electronic conducting nature. oxygen reduction porous electrodes on gadolinium-doped ceria electrolyte studied symmetrical configuration impedance spectroscopy. CO 2 tolerance stability were also investigated. Impedance spectra obtained zero bias conditions consisted two semicircular arcs, which indicate overall comprises least distinct processes. area specific resistance (ASR) electrode wide temperatures (600-850°C). ASR value 600°C be 0.16 Ω cm , offers promise utilizing as cathode low SOFCs.