Influence of Cell Design on the Performance of Direct Ammonia-Fueled Solid Oxide Fuel Cell: Anode- vs. Electrolyte-Supported Cell

In this study, the performance of anode-supported and electrolyte-supported cells was compared under similar operating conditions for direct ammonia-fueled solid oxide fuel cells (SOFCs); the cell configuration of both types of cells was as follows, Ni‒YSZ|YSZ|GDC|LSCF. The anode-supported cell (ASC) showed better performance as compared with that of the electrolyte-supported cell (ESC). The influence of the humidity of inlet gas on the performance of ASC was investigated at 700 oC. The cell performance did not change substantially under different humidified conditions. In addition, the long-term discharge operation of direct ammonia-fueled ASC was conducted at 600 oC for ca. 235 h. The durability of ASC under polarization was evaluated on the basis of the measured current-voltage and power density curves. The cell showed slight degradation in current density and power density after discharge operation. Furthermore, the formation temperature of Ni3N under ammonia-fueled SOFC conditions was investigated in detail.