Open AccessInfluence of Carbon Dioxide and Humidity on the Stability of (La0.6Sr0.4)0.99Co1−xTixO3−δ Cathode
Author(s) -
Alar Heinsaar,
Indrek Kivi,
Priit Möller,
Kuno Kooser,
Tanel Käämbre,
Jaan Aruväli,
Gunnar Nurk,
Enn Lust
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac4a53
Subject(s) - x ray photoelectron spectroscopy , analytical chemistry (journal) , materials science , cathode , impurity , electrochemistry , electrical resistivity and conductivity , dielectric spectroscopy , carbon dioxide , water vapor , conductivity , electrode , chemistry , chemical engineering , electrical engineering , organic chemistry , chromatography , engineering
(La 0.6 Sr 0.4 ) 0.99 CoO 3− δ is a very promising cathode material due to its excellent electronic and ionic conductivity. However, non-artificial air from the ambient atmosphere contains impurities such as H 2 O and CO 2 , which cause degradation and performance loss of the cathode. Introduction of Ti into the B-site of (La 0.6 Sr 0.4 ) 0.99 CoO 3− δ improves the chemical stability of the material. (La 0.6 Sr 0.4 ) 0.99 Co 1−x Ti x O 3− δ (0 ≤ x ≥ 0.1) electrodes prepared in this work were analyzed using X-ray diffraction method (XRD), X-ray photoelectron spectroscopy (XPS), and electrochemical impedance spectroscopy (EIS). Studied (La 0.6 Sr 0.4 ) 0.99 CoO 3− δ materials with Ti in B-site showed reversible degradation under gas mixture with carbon dioxide addition. Improved stability was observed for (La 0.6 Sr 0.4 ) 0.99 Co 1−x Ti x O 3− δ materials with Ti in B-site compared to unmodified (La 0.6 Sr 0.4 ) 0.99 CoO 3− δ in gas mixture containing water vapour.