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http://dx.doi.org/10.4191/kcers.2016.53.5.511

Application of a General Gas Electrode Model to Ni-YSZ Symmetric Cells: Humidity and Current Collector Effects  

Shin, Eui-Chol (School of Materials Science and Engineering, Chonnam National University)
Ahn, Pyung-An (School of Materials Science and Engineering, Chonnam National University)
Seo, Hyun-Ho (School of Materials Science and Engineering, Chonnam National University)
Lee, Jong-Sook (School of Materials Science and Engineering, Chonnam National University)
Publication Information
Journal of the Korean Ceramic Society / v.53, no.5, 2016 , pp. 511-520 More about this Journal
Abstract
Electrolyte-supported symmetric Ni-YSZ cermet electrodes of ca. $23{\mu}m$ were prepared by screenprinting and the impedance was measured as a function of humidity from 2% to 90% balanced in $H_2$ at a total flow rate of 50 sccm. The Ni felt current collector of 1 mm thickness exhibited a Gerischer-like gas concentration impedance in the low frequency range, which was similarly observed in the cermet-supported solid oxide cells, while the Pt paste collector exhibited only electrochemical polarization. The electrochemical polarization of both samples was modeled by a non-ideal diffusion-reaction transmission line model including CPEs with ${\alpha}$= 0.5. In the case of the Pt paste collector, all the Bisquert parameters exhibited humidity dependence to the -1/2 power, supporting a non-faradaic chemical reaction mechanism at three phase boundaries. Consequently, the surface diffusivity and reaction rate increased linearly with humidity. Less pronounced humidity dependence and somewhat lower utilization length with an Ni felt collector can be attributed to the diffusion-limited gas flow through the collector.
Keywords
Ni-YSZ cermet; Current collector; Gas concentration impedance; Humidity effects; General Bisquert model;
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