Abstract
The effect of anode microstructure on the electrochemical performance of cathode-supported micro solid oxide fuel cells (SOFCs) was evaluated using current-voltage and ac impedance measurements. Small-scale cells were fabricated by the extrusion of a microtubular (La 0.8 Sr 0.2 ) 0.97 MnO 3 support and subsequent surface coating with a Ce 0.9 Gd 0.1 O 1.95 /Sc 2 O 3 -doped ZrO 2 bilayer electrolyte and NiO-Ce 0.9 Gd 0.1 O 1.95 anode layers. Impedance analysis and scanning electron microscopy observations indicate that an anode layer with coarse NiO particles has a higher porosity and electrode activity than that with fine NiO particles. The SOFC with coarse NiO particles generated more than twice the power density of that with fine NiO particles.
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