Resisting coking and sulfur poisoning of double perovskite Sr2TiFe0.5Mo0.5O6-δ anode material for solid oxide fuel cells

Development of high performance anode materials with resisting coking and sulfur poisoning is significant for the practical application of solid oxide fuel cells (SOFCs). Here we report a nickel-free double perovskite anode material Sr2TiFe0.5Mo0.5O6-delta (STFM05), which exhibits excellent electrochemical performance using H-2 as fuel and acceptable electrochemical stability in syngas fuel containing H2S. At 800 degrees C, the STFM05 anode shows the electrical conductivity value of 22.3 S cm(-1) in H-2 and the maximum power densities of 547 and 215 mWcm(-2) with electrolyte-supported cell using H-2 and syngas as fuels, respectively. The single cell with STFM05 anode shows a relatively stable electrochemical performance in syngas at 750 degrees C, and no carbon deposition is detected by Raman spectroscopy. In addition, STFM05 anode is thermally and chemically compatible with the La0.9Sr0.1Ga0.8Mg0.2O3-delta and Ce0.8Sm0.2O1.9 electrolytes in reducing atmosphere. These preliminary results suggest that the STFM05 double perovskite is a promising candidate of anode material with coking resistance and sulfur tolerance for use in SOFCs. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.