Improving solid oxide fuel cell performance by a single-step co-firing process

Abstract Solid oxide fuel cells (SOFCs) with Sm_0.2Ce_0.8O_2-δ (SDC) as the electrolyte are successfully prepared by a single-step co-firing process with the sintering temperature as low as 1100 °C. Different from the conventional SOFC preparation procedure that involves multistep firing processes, the single-step co-firing preparation procedure simplifies the fuel cell preparation procedure and additionally improves the fuel cell performance. The cell prepared by the single-step process exhibits the maximum power density of 289 mW cm^-2 at 700 °C, while the cell prepared by the conventional method is only 211 mW cm^-2, with an increase of 37% been achieved. The impedance analysis reveals that the single co-firing procedure not only improves the contact between the electrolyte and electrodes, but also lowers the cell polarization resistance, thus leading to a better fuel cell performance.