(563f) Electrochemical Characterization of SrTi0.3Fe0.7O3-?-GDC Composite Anodes for Solid Oxide Fuel Cell

In this work, SrTi_0.3Fe_0.7O_3-δ-GDC (STF-GDC; GDC, Gd_0.1Ce_0.9O_1.95) composite is adopted as anode materials to systematically investigate the effect of GDC addition on the anode stability and electrochemical property. La_0.8Sr_0.2Ga_0.8Mg_0.2O_3-δ(LSGM) electrolyte supported single cells with STF-GDC anode and LSCF-GDC/LSCF (LSCF, La_0.4Sr_0.6Co_0.2Fe_0.8O_3-δ) cathode are prepared via screen printing and high temperature calcination in air. The weight percentages of GDC in composite anodes is 10%, 20%, 30% and 40%. La_0.4Ce_0.6O_2-δis used as barrier layer between anode and LSGM electrolyte. Electrochemical Impedance Spectrum (EIS) and single cells output performance is tested under different anode hydrogen partial pressure. A typical equivalent circuit model is used to fit the EIS data. Fitting results show three responses and only high frequency response is nearly no change with decreasing of hydrogen partial pressure so it could be attributed to the cathode process. Moreover, it is observed that with the amount of GDC increasing, current density generated at 0.7 V decreases more quickly with decreasing of hydrogen partial pressure. At last, the van Der Pauw DC conductivity test is conducted to characterize the conducting property of the STF-GDC composite anodes.