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Performance of La 2– x Sr x Co 0.5 Ni 0.5 O 4±δ as an Oxygen Electrode for Solid Oxide Reversible Cells
Author(s) -
LagunaBercero M. A.,
Kinadjan N.,
Sayers R.,
El Shinawi H.,
Greaves C.,
Skinner S. J.
Publication year - 2011
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201000067
Subject(s) - electrolysis , oxide , dielectric spectroscopy , stoichiometry , materials science , solid oxide fuel cell , analytical chemistry (journal) , electrochemistry , oxygen , yttria stabilized zirconia , fuel cells , electrolytic cell , electrode , cubic zirconia , chemical engineering , ceramic , chemistry , anode , metallurgy , organic chemistry , chromatography , electrolyte , engineering
La 2 – x Sr x Co 0.5 Ni 0.5 O 4 ± δ (LSCN) is presented as a novel electrode for both solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs). LSCN/10Sc1CeSZ (scandia and ceria stabilised zirconia)/LSCN symmetrical cells were fabricated and characterised by AC impedance spectroscopy under different oxygen partial pressures at temperatures of up to 900 °C. At 850 °C polarisation resistances of 5.15 and 5.74 Ω cm 2 were found applying air and oxygen, respectively. Electrolysis and fuel cell j –V experiments were also performed at temperatures between 700 and 850 °C using a LSCN/10Sc1CeSZ/Ni‐YSZ. Electrochemical results showed that the cell performs equally in both SOFC and SOEC modes. Detailed results in terms of performance are presented and discussed. LSCN is presented as a good candidate for both SOFC and SOEC. The similar performance obtained for j – V (current density–voltage) curves in electrolysis and fuel cell operation mode is thought to be related to the flexible oxygen non‐stoichiometry of the LSCN (K 2 NiF 4 ‐type structure).