Electrode protective barrier layers for molten carbonate confinement
authors Jamale, A; Starykevich, M; Marques, FMB
nationality International
journal INTERNATIONAL JOURNAL OF ENERGY RESEARCH
author keywords barrier layers; composite electrolytes; electrodes; impedance spectroscopy; molten carbonates
keywords OXYGEN REDUCTION; CO2 SEPARATION; ELECTROCHEMICAL-BEHAVIOR; COMPOSITE ELECTROLYTES; OXIDE; CELL; CONDUCTIVITY; TEMPERATURE; IMPROVEMENT; STABILITY
abstract Pure NiO or lithiated NiO with distinct Li/Ni atomic proportions (50/50-LN55 and 30/70-LN37) were tested as protective barrier layers (PBLs) to enhance the stability of LaCoO3(LC) electrodes in cells with composite electrolytes (CEs) consisting of Gd-doped ceria (CGO) and a eutectic mixture of Na and Li carbonates (NLCs). PBLs and LC layers were sequentially deposited by screen printing before firing at 700 degrees C and 550 degrees C, respectively, to yield symmetrical cells (LC|PBL|CE|PBL|LC). Electrochemical testing involved impedance spectroscopy measurements in air in the 500 degrees C to 650 degrees C range. Scanning electron microscopy combined with energy-dispersive X-ray spectroscopy (SEM/EDS) revealed that distinct PBLs possess uneven wetting tendency, with impact on the role of LC layers. The best electrode performance (0.55 omega cm(2)electrode area specific resistance at 550 degrees C in air) was observed using the LN37 PBL, stable throughout endurance tests up to 200 hours. Possible electrode mechanisms consistent with experimental evidence suggest an active role of the molten phase as an intermediate provider of O(2-)transport between the electrode and CGO.
publisher WILEY
issn 0363-907X
isbn 1099-114X
year published 2021
volume 45
issue 2
beginning page 2945
ending page 2958
digital object identifier (doi) 10.1002/er.5990
web of science category 14
subject category Energy & Fuels; Nuclear Science & Technology
unique article identifier WOS:000568965600001
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