Electrochemical Performances of La-doped SrTiO_3 Anode Materials for Intermediate Temperature-Solid Oxide Fuel Cells

摘要

La_(0.4)Sr_(0.6)TiO_3 (LST) is considered a candidate material for anodes to solve the drawbacks of Ni-based cermets in solid oxide fuel cells (SOFCs). In this work, LST materials are fabricated with highly conductive Nd_(0.1)Ce_(0.9)O_2 (NDC) electrolyte and characterized to investigate the feasibility of SOFCs at the intermediate temperatures (IT). In addition, LST is composited with NDC to improve the ionic conductivity and decrease the thermal expansion mismatch of anode materials to the electrolyte. The electrochemical impedance spectra analysis shows that the area specific resistance of the LST-NDC composite anode decreases with increasing NDC concentration and a ratio of 7:3 (LST:NDC) in weight fraction exhibits the lowest polarization resistance value at 650°C. The maximum power density of the LST-NDC composite anode-cell was 143 mW cm~(-2) at 650°C. We thus confirm that LST could be used as an anode material for the application of IT-SOFCs.