Development of composite LaNi0·6Fe0.4O3-δ-based air electrodes for solid oxide fuel cells with a thin-film bilayer electrolyte. (10th May 2021)

• Record Type: Journal Article
• Authors: Pikalova, E.; Bogdanovich, N.; Kolchugin, A.; Shubin, K.; Ermakova, L.; Eremeev, N.; Farlenkov, A.; Khrustov, A.; Filonova, E.; Sadykov, V.
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 32(2021)
• Page Start: 16947
• Page End: 16964
• Publication Date: 2021-05-10
• Subjects: SOFC cathode -- LaNi0.6Fe0.4O3-δ -- Doped Bi2O3 -- Collector -- Polarization resistance -- SOFC performance; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.02.217
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study the bilayer composite electrodes based on LaNi0 .6 Fe0 .4 O3-δ (LNF) electronic conductor and Bi2 O3 -based electrolytes doped with Er (Bi1 .6 Er0 .4 O3, EDB) and Y (Bi1 .5 Y0 .5 O3, YDB) have been developed and their performance has been investigated in the dependence on the electrolyte content and sintering conditions. The polarization resistance of the optimized electrodes with electrolyte content of 50 wt % in the functional layer and with the LNF-EDB-CuO collector is in a range of 0.65–1.09 Ω cm 2 at 600 °C and 0.10–0.12 Ω cm 2 at 700 °C. The polarization characteristics of the Bi-based electrodes are compared with those for the composite electrodes based on LNF and Ce0.8 Sm0.2 O1.9 (SDC). The developed electrodes have been tested in a SOFC mode in the anode-supported cells with a thin film electrolyte of YSZ/YDC (Y-doped zirconia/ceria). The single cells with such cathodes are shown to have performance characteristics that are several times higher than that for the cell with a standard platinum cathode. This is due to the optimized content and dispersity of the components; high conductivity of ionic and electronic constituents of the composite electrodes; greatly extended triple phase boundary (TPB) of the electrochemical reaction and advanced electrode design with collector providing uniform current distribution. Graphical abstract: Image 1 Highlights: LaNi0·6 Fe0·4 O3 -based composite electrodes comprising doped Bi2 O3 or CeO2 are studied. Optimal electrolyte content and sintering conditions of electrode layers are defined. Polarization resistance of developed electrodes is as low as 0.10–0.12 Ω cm 2 at 700 °C. SOFC with YSZ/YDC electrolyte and optimized electrode performs 745 mW/cm 2 at 700 °C. Electrode characteristics under various atmospheres are analyzed using DRT method.