Electrical conductivity and electrochemical performance of SrMo0.94Fe0.06O3-δ-Gd0.2Ce0.8O1.9 composite for SOFC anode

Fe-doped SrMoO4 (SrMo0.94Fe0.06O4-delta), synthesized by an EDTA-glycine complexing combustion process, can be easily reduced to SrMo0.94Fe0.06O3-delta (SMF) at 850 degrees C in pure H-2 atmosphere. The incorporation of Gd0.2Ce0.8O1.9 (GDC) into SrMo0.94Fe0.06O3-delta is supposed to enhance the ionic conductivity and catalytic activity of SMF. Phase composition and chemical compatibility of SMF-GDC composite in both air and H-2 atmosphere are confirmed by X-ray diffraction test. SMF-GDC composites in different mass ratios are systematically investigated in terms of electrical conductivity, electrochemical performance and power output with the fuel cells. With the addition of GDC, the ionic conductivity is able to be improved and the lowest interfacial polarization resistance is observed to be 0.647 Omega cm(2) for SMF7-GDC3 composite anode at 850 degrees C. With SMF7-GDC(3) as anode, the single cell is able to generate a maximum power density of 530 mW cm(-2) at 850 degrees C when fed with pure H-2 (30 mL min(-1)) and demonstrates a considerable stability with the anode exposed to H-2 and upon redox cycling. (C) 2015 Elsevier B.V. All rights reserved.