화학공학소재연구정보센터
International Journal of Hydrogen Energy, Vol.37, No.24, 19027-19035, 2012
Characterization of nanosized Ce0.8Sm0.2O1.9-infiltrated Sm0.5Sr0.5Co0.8Cu0.2O3-delta cathodes for solid oxide fuel cells
This study investigates the microstructure and electrochemical properties of Sm0.5Sr0.5Co0.8Cu0.2O3-delta (SSC-Cu) cathode infiltrated with Ce0.8Sm0.2O1.9 (SDC). The newly formed nanosized electrolyte material on the cathode surface, leading the increase in electrochemical performances is mainly attributed to the creation of electrolyte/cathode phase boundaries, which considerably increases the electrochemical sites for oxygen reduction reaction. Based on the experiment results, the 0.4 M SDC infiltration reveals the lowest cathode polarization resistance (R-p), the cathode polarization resistances (R-p) are 0.117, 0.033, and 0.011 Omega cm(2) at 650, 750, and 850 degrees C, and the highest peak power density, are 439, 659, and 532 mW cm(-2) at 600, 700, and 800 degrees C, respectively. The cathode performance in SOFCs can be significantly improved by infiltrating nanoparticles of SDC into an SSC-Cu porous backbone. This study reveals that the infiltration approach may apply in SOFCs to improve their electrochemical properties. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.