Influence of the Ti Content on the Electrochemical Performance and Surface Properties of (La0.6Sr0.4)0.99Co1− xTixO3− δ Oxygen Electrode

(La0.6Sr0.4)0.99CoO3-δ oxygen electrode material is a very promising oxygen electrode material due to its excellent electron and ionic conductivity. However, when using non-artificial air from the ambient atmosphere, it contains impurities such as H2O and CO2. These chemicals increase the degradation rate of the oxygen electrode. Introducing Ti into the B-site of (La0.6Sr0.4)0.99CoO3-δ B-site increases the chemical stability of this oxygen electrode material. Synthesized and fabricated (La0.6Sr0.4)0.99Co1-xTixO3-δ (0 ≤ x ≥ 0.1) electrodes and half cells were analyzed using X-ray diffraction method (XRD), X-ray photoelectron spectroscopy (XPS), and with electrochemical impedance spectroscopy (EIS). Results indicate that doping of (La0.6Sr0.4)0.99CoO3-δ B-site with Ti makes this material more resilient to form unwanted compounds on the oxygen electrode surface.