Journal
FUEL CELLS
Volume 14, Issue 2, Pages 200-211Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/fuce.201300024
Keywords
Anode-Supported; Co-extrusion; Electrolyte-Supported; Hollow Fibers (HFs); Micro-tubular Solid Oxide Fuel Cells (MT-HF-SOFCs); Ni Electroless Plating; Phase Inversion
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Funding
- UK Engineering and Physical Sciences Research Council
- Engineering and Physical Sciences Research Council [EP/J016454/1] Funding Source: researchfish
- EPSRC [EP/J016454/1] Funding Source: UKRI
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Two types of micro-tubular hollow fiber SOFCs (MT-HF-SOFCs) were prepared using phase inversion and sintering; electrolyte-supported, based on highly asymmetric Ce0.9Gd0.1O1.95(CGO) HFs and anode-supported based on co-extruded NiO-CGO(CGO)/CGO HFs. Electroless plating was used to deposit Ni onto the inner surfaces of the electrolyte-supported MT-HF-SOFCs to form Ni-CGO anodes. LSCF-CGO cathodes were deposited on the outer surface of both these MT-HF-SOFCs before their electrochemical performances were compared at similar operating conditions. The performance of the anode-supported MT-HF-SOFCs which delivered ca. 480mWcm(-2) at 600 degrees C was superior to the electrolyte-supported MT-HF-SOFCs which delivered ca. six times lower power. The contribution of ohmic and electrode polarization losses of both FCs was investigated using electrochemical impedance spectroscopy. The electrolyte-supported MT-HF-SOFCs had significantly higher ohmic and electrode polarization ASR values; this has been attributed to the thicker electrolyte and the difficulties associated with forming quality anodes inside the small (<1mm) lumen of the electrolyte tubes. Further development on co-extruded anode-supported MT-HF-SOFCs led to the fabrication of a thinner electrolyte layer and improved electrode microstructures which delivered a world leading 2,400mWcm(-2). The newly made cell was investigated at different H-2 flow rates and the effect of fuel utilization on current densities was analyzed.
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