Ammonia (NH3) has very interesting features as fuel for solid oxide fuel cell (SOFC). This study presents preliminary experimental results on a single cell SOFC fueled by ammonia. The study focuses on the cracking reaction that permits to transform ammonia into N2 and H2. This reaction offers to the fuel cell a perfect mix for the operation in safety and efficient conditions. The study compares several polarization curves realized with pure H2, a mix of H2/N2 and a mix of H2/NH3 and pure NH3 at high operation temperature (800°C). The results show how a complete reaction of NH3 can be predicted and an equivalent performance can be obtained substituting the H2/N2 mix with equivalent amount of ammonia.