Journal
JOURNAL OF POWER SOURCES
Volume 268, Issue -, Pages 634-639Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.03.080
Keywords
Lanthanum strontium cobalt ferrite; Gadolinia doped ceria; Reversible solid oxide fuel cell; Solid oxide electrolysis cell
Funding
- National Basic Research Program of China (973 Program) [2012CB215404]
- China Scholarship Council [201306430012]
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A La0.6Sr4Co0.2Fe0.8O3-delta (LSCF) oxygen electrode and a Gd0.1Ce0.9O2-delta (GDC) barrier layer are prepared for a reversible solid oxide fuel cell (RSOFC). Scanning electron microscopy (SEM) analysis shows that the GDC barrier layer has a honeycomb-like structure and maintains good adhesion with yttria-stabilized zirconia (YSZ) electrolyte and LSCF oxygen electrode. Polarization curves and electrochemical impedance spectra for both fuel cell and steam electrolysis modes are investigated. Repeated fuel cell/steam electrolysis cycles operated at 300 mA cm(-2) and 800 degrees C shows the cell has higher degradation under steam electrolysis mode than under fuel cell mode. Cell degradation in electrolysis mode is attributed to delamination of the GDC barrier layer from the YSZ electrolyte, which has been observed during post-test SEM analysis. (C) 2014 Elsevier B.V. All rights reserved.
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