One Step Synthesis of Sr2Fe1.3Co0.2Mo0.5O6−δ -Gd0.1Ce0.9O2−δ for Symmetrical Solid Oxide Fuel Cells

Homogenous distribution of individual phases in the composite electrode is critical to the overall electrode performance. In this work, we report a one-step synthesis method to fabricate Sr2Fe1.3Co0.2Mo0.5O6-delta-Gd0.1Ce0.9O2-delta (SFCM-GDC) composite electrode material for symmetrical solid oxide fuel cells (SSOFCs). X-ray diffraction analysis reveals that the characteristic peaks of the perovskite and fluorite phases are obtained in the SFCM-GDC powder via the one-step synthesis method without any observable impurities. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) indicate a better phase distribution of the composite electrode of SFCM-GDC via one-step synthesis than that via a mechanically mixing process. As a result, the area specific resistance (ASR) of SFCM-GDC electrode is effectively decreased to 0.036 Omega cm(2) and 0.047 Omega cm(2) at 850 C-o in air and hydrogen, respectively, compared to that of 0.041 Omega cm(2) and 0.074 Omega cm(2) of the mechanically mixed SFCM and GDC (SFCM+GDC). The maximum power density of a cell with configuration of SFCM-GDC parallel to LSGM parallel to SFCM-GDC can reach 0.986 W cm(-2), higher than that with mechanically mixed electrode of 0.894 W cm(-2) at 800 degrees C. This work shows that one step synthesis method is an effective way to fabricate composite electrode with enhanced electrode performance. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.