Comparative Study of Ammonia‐fueled Solid Oxide Fuel Cell Systems

Several solid oxide fuel cell (SOFC) systems can be considered for the NH 3 utilization. In this study, the catalytic activity and long‐term stability of the NH 3 decomposition reactor with the Ni/Y 2 O 3 ‐based catalysts and the autothermal NH 3 cracker with the Co–Ce–Zr composite oxide catalyst were investigated. Moreover, the NH 3 decomposition reactor and the autothermal NH 3 cracker were combined with the SOFC stack and their performances of the stack were compared to those fueled with NH 3 and H 2 /N 2 . The power output of each SOFC stack was over 200 W. Moreover, it was demonstrated that the direct NH 3 ‐fueled SOFC stack was stable for 1,000 h at 770 °C without significant degradation.