화학공학소재연구정보센터
Journal of the Electrochemical Society, Vol.159, No.8, F426-F435, 2012
Electrochemical Properties of Composite (Sm0.5Sr0.5)(Co0.8M0.2)O3-delta (M=Cu, Mn) Cathodes for Intermediate Temperature Solid Oxide Fuel Cells
This study investigates the electrochemical properties of (Sm0.5Sr0.5)(Co0.8M0.2)O3-delta (M=Cu, Mn) cathodes and evaluates them for solid oxide fuel cells (SOFCs). According to the relationship between interfacial polarization resistance at high frequency (R-2) and oxygen partial pressure (Po-2) at different temperatures, it indicates that oxygen reduction reactions are almost entirely dominated by the electron-transfer process for (Sm0.5Sr0.5)CoO3-delta-based cathodes with increasing the temperature. The result of the interfacial polarization resistance at high frequency (R-3) as a function of oxygen partial pressure revealed that oxygen reduction reactions are nearly dominated by oxygen adsorption/desorption processes for (Sm0.5Sr0.5)CoO3-delta-based cathodes with increasing the temperature. The exchange current density (i(0)), is an important parameter for evaluating the electrocatalytic activity of cathode. The SSC-Cu revealed the largest i(0) value among SSC-based cathodes at the temperature range of 600-800 degrees C. Based on experimental results, the SSC-Cu showed the better performance in terms of electrochemical properties than those in the SSC cathode. Therefore, SSC-Cu may potentially be applied in intermediate temperature solid oxide fuel cell (IT-SOFC). (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.027208jes]