Influence of the Ti Content on the Electrochemical Performance and Surface Properties of (La 0.6 Sr 0.4 ) 0.99 Co 1− x Ti x O 3− δ Oxygen Electrode

• Published in: ECS transactions 2021-07, Vol.103 (1), p.1433-1444
• Main Authors: Heinsaar, Alar, Kivi, Indrek, Moeller, Prit, Kooser, Kuno, Käämbre, Tanel, Aruväli, Jaan, Lust, Enn, Nurk, Gunnar
• Format: Article
• Language: English
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/10301.1433ecst

(La 0.6 Sr 0.4 ) 0.99 CoO 3 - 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 H 2 O and CO 2 . These chemicals increase the degradation rate of the oxygen electrode. Introducing Ti into the B-site of (La 0.6 Sr 0.4 ) 0.99 CoO 3 - δ B-site increases the chemical stability of this oxygen electrode material. Synthesized and fabricated (La 0.6 Sr 0.4 ) 0.99 Co 1 - x Ti x O 3 - 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 (La 0.6 Sr 0.4 ) 0.99 CoO 3 - δ B-site with Ti makes this material more resilient to form unwanted compounds on the oxygen electrode surface.