Abstract
Anode-supported planar solid oxide fuel cells (SOFCs) were fabricated by a single-step cofiring process. It comprised of a porous -stabilized zirconia (YSZ) anode support, a porous and fine-grained anode active layer, a dense YSZ electrolyte, a fine-grained porous Ca-doped composite cathode active layer, and a porous LCM cathode current collector layer. The cell was tested between 700 and with humidified hydrogen (97% ) as the fuel and air as the oxidant. The measured maximum power densities were at , at , and at . The cell was also tested at with various compositions of fuel and oxidant, and the cell parameters, which included the area specific ohmic resistance, exchange current densities, and anodic and cathodic limiting current densities, were obtained through polarization modeling. The polarization resistances of the cell were calculated using the cell parameters obtained from modeling, and compared with the corresponding values measured using impedance spectroscopy. The effect of cell operating conditions on various polarization losses and performance was analyzed in detail using the polarization modeling results.
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