Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 167, Issue 11, Pages -Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/aba00f
Keywords
Impedance; Diffusivity; Reaction constant; Effective length
Funding
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Korea government (Ministry of Science and ICT) [NRF-2017M1A2A2044927]
- KEPCO & Korea Western Power Co.
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In this work, electrochemical impedance spectroscopy (EIS) and distribution of relaxation times (DRT) analysis were used to evaluate the performance determining parameters for a solid-oxide fuel and electrolysis cell. The SOFC/EC was formulated with 8 mol% Yttria-stabilized zirconia (YSZ) electrolyte sandwiched between Ni-YSZ fuel electrode and La0.6Sr0.4Co0.2Fe0.8O3-10mol% gadolinium doped ceria (LSCF6428-GDC10, 5:5) composite air electrode. To deconvolute the multistep elementary reactions at both of the electrodes, EIS was measured as a function of temperature (775 degrees C-850 degrees C), gas compositions, and gas flow rates (50-200 sccm). Concurrently, DRT analysis was employed to resolve frequency-dependent electrode reactions effectively. From the DRT analysis, multistep elementary reactions at fuel and air electrode were separated and corresponded to a transmission line equivalent circuit model with parameters (R-s,R-el., R-p,R-el. and C-p,C-el.). Finally, the cell performance limiting factors such as apparent diffusivity ((D) over tilde (app)), surface reaction constant (k), and effective lengths (L-eff) of each electrode were determined. (c) 2020 The Electrochemical Society (ECS). Published on behalf of ECS by IOP Publishing Limited.
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