Characterization and Optimization of La0.97Ni0.5Co0.5O3−δ -Based Air-Electrodes for Solid Oxide Cells

Ma, Qianli; Pérez-Coll, Domingo; de Haart, L.G.J.; Balaguer, Maria; Mather, Glenn C.; Tietz, Frank; Menzler, Norbert H.; Guillon, Olivier; Serra, Jose M.

doi:10.1021/acsaem.8b00456

Journal Article

FZJ-2018-04626

Characterization and Optimization of La0.97Ni0.5Co0.5O3−δ -Based Air-Electrodes for Solid Oxide Cells

Ma, Q. (Corresponding author)FZJ* ; Balaguer, M. ; Pérez-Coll, D. ; de Haart, L. G. J.FZJ* ; Serra, J. M. ; Mather, G. C. ; Tietz, F.FZJ* ; Menzler, N. H.FZJ* ; Guillon, O.FZJ*

2018
ACS Publications Washington, DC

ACS applied energy materials 1(6), 2784 - 2792 (2018) [10.1021/acsaem.8b00456]

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Please use a persistent id in citations: doi:10.1021/acsaem.8b00456

Abstract: On the basis of previous studies of perovskites in the quasi-ternary system LaFeO3–LaCoO3–LaNiO3, LaNi0.5Co0.5O3 (LNC) is chosen as the most promising air-electrode material in the series for solid oxide cells (SOCs). In the present study, A-site deficiency of LNC is discussed and La0.97Ni0.5Co0.5O3 (LNC97) is selected as the optimal composition. Compatibility of LNC97 with 8 mol % Y2O3 stabilized ZrO2 (8YSZ) is analyzed and compared with that of the state-of-the-art air-electrode La0.58Sr0.4Co0.2Fe0.8O3−δ (LSCF) and 8YSZ. Targeting to the requirements of high-performance SOC air-electrodes (high electronic and ionic conductivity and high catalytic activity for the oxygen reduction reaction), LNC97-based air-electrodes are tailored, characterized and optimized by symmetric-cell tests. Principles of air-electrode design for SOCs are revealed accordingly. Long-term measurement of the symmetric cells over a period of 1000 h is performed and possible degradation mechanisms are discussed. Full cells based on optimized LNC97 air-electrodes are also tested. Lower reactivity with 8YSZ in comparison to LSCF and a similar performance render LNC97 a very competitive candidate to substitute LSCF as air-electrode material of choice for SOCs.

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