Electrical characterization of the platinum/YSZ interfaces in SOFCs via micro-contact impedance spectroscopy
- Authors
- Lee, B. -K.; Yu, Y. -H.; So, B. -S.; Kim, S. -M.; Kim, J.; Lee, H. -W.; Lee, J. -H.; Hwang, J. -H.
- Issue Date
- Dec-2006
- Publisher
- SPRINGER
- Keywords
- SOFC; impedance spectroscopy; micro-contact; electrodes; spreading resistance
- Citation
- JOURNAL OF ELECTROCERAMICS, v.17, no.2-4, pp.735 - 739
- Journal Title
- JOURNAL OF ELECTROCERAMICS
- Volume
- 17
- Number
- 2-4
- Start Page
- 735
- End Page
- 739
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/24487
- DOI
- 10.1007/s10832-006-6583-y
- ISSN
- 1385-3449
- Abstract
- The concept of micro-contact in electrodes was incorporated into AC two-probe impedance spectroscopy in order to clarify the electrode-related responses in solid oxide fuel cells (SOFCs). The pointed contact of one electrode was combined with the planar electrode as a counterpart in characterizing an YSZ (yttria-stabilized zirconia)/Pt interface of SOFCs. The micro-contact in electrodes induced the decrease in capacitance and the increase in impedance and amplified the bulk responses in YSZ due to the constricted electroding area. The bulk-related portions can be separated from the interfacial polarization of Pt, even though the electrolyte/electrode interface was found to be very sensitive to the measurement condition, i.e., the oscillating voltage. The resolved bulk and interfacial resistances were analyzed using a concept of "spreading resistance.'' Furthermore, the electrode-related issues were ramified for the application of impedance spectroscopy to the solid oxide fuel cells.
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Collections - College of Engineering > Materials Science and Engineering Major > 1. Journal Articles
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