THIN-FILM SAMARIA DOPED CERIA SOFCS FOR DIRECT OXIDATION OF HYDROCARBON FUELS AT INTERMEDIATE TEMPERATURES

摘要

Solid oxide fuel cells (SOFCs) with thin-film samaria doped ceria (SDC) electrolytes (～55μm) and Cu-based anodes have been fabricated and are active for directly oxidizing hydrocarbon fuels at intermediate temperatures. Electrochemical and impedance measurements were used to evaluate and characterize the cell performance. The results show that the thin-film cells are able to directly utilize both hydrogen (H_2) and dry butane (C_4H_(10)) fuels in the temperature range from 550°C to 700°C. At 700°C the cell maximum power densities are 245 mW/cm~2 and 161 mW/cm~2 for H2 and C_4H_(10) fuel, respectively, and decrease as the operating temperature is reduced. Decreasing the SDC electrolyte thickness did not increase the cell performance at 700°C. This indicates that increases in cell power density will likely require improvements in the anode activity.