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Received December 18, 2011
Accepted March 14, 2012
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Characterizations of impedance responses in an anode-supported solid oxide fuel cell with an air blowing system

School of Materials Science & Engineering, Yeungnam University, Gyeongsan 712-749, Korea 1Fuel Cell Project, Research Institute of Industrial Science and Technology, Pohang 790-330, Korea
Korean Journal of Chemical Engineering, November 2012, 29(11), 1541-1548(8), 10.1007/s11814-012-0037-9
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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_x000D_ 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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