Anode-supported SOFC Operated Under Single-chamber Conditions at Intermediate Temperatures

摘要

Anode-supported SOFC was fabricated using gadolinia doped ceria (GDC) as the electrolyte (15μm of thickness), Ni-GDC as the anode and La_(0.5)Sr_(0.5)CoO_(3-δ)-GDC as the cathode. Catalytic activities of the electrodes and electrical properties of the cell were determined, using mixtures of methane + air, under single-chamber conditions. This work assessed with special and wide emphasis the effect of temperature, gas composition and total flow rate on the cell performance. As a result, operational temperature range of the fuel cell was approximately between 700 and 800℃, which agrees with the results corresponding to the catalytic activities of electrodes. While Ni-GDC anode was enough active towards methane partial oxidation at cell temperatures higher than 700℃, the LSC-GDC cathode was enough inactive towards partial and total oxidation of methane at cell temperatures lower than 800℃. Under optimised gas compositions (CH_4/O_2 ratio and total flow rate ((530 mL min~(-1)), power densities of 145 and 235 mW cm~(-2) were obtained at 705 and 764℃, respectively.