Abstract
Effects of operation parameters on impedance responses are characterized to study electrochemical reactions of an anode-supported solid oxide fuel cell (SOFC) in an air blowing operation. The anode-supported SOFC, which consists of Ni-yttrium stabilized zirconia (YSZ) support/Ni-YSZ anode functional layer/YSZ electrolyte/gadolinium doped ceria (GDC) interlayer/La0.6Sr0.4Co0.2Fe0.8O3-δ-GDC cathode, is fabricated by a tape casting and co-firing process. To investigate the electrochemical response on impedances, an equivalent circuit is modeled with five elements and fitted by the complex nonlinear least square (CNLS) method. Based on the impedance spectra with the operation parameters, two among five elements are clarified to be concerned with anodic reactions and another two concerned with gas diffusion reactions in electrodes. It is difficult to clarify one among five elements with the results here. The clarified elements may be used to study the effects of materials and processes for SOFC with impedance responses, which will be helpful to improve the performance and reliability.
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