Nuggehalli Sampathkumar, SuhasSun, XiufuJoris, SteveVan Herle, JanMiddleton, Peter HughFrandsen, Henrik Lund2021-11-192021-11-192021-07-1810.1149/10301.0185ecsthttps://infoscience.epfl.ch/handle/20.500.14299/183052Ammonia (NH3) has 17.8 wt% hydrogen and is easily liquified at 25°C and 8 bar pressure. Ammonia is carbon-free and can be produced sustainably at large scale and low cost. Solid oxide fuel cells generate electricity with efficiencies greater than 60% and can use ammonia as fuel without the need for external cracking. In this work, a single-cell SOFC was characterized using the in-situ ammonia decomposition reaction (Int-ADR) and compared with the ex-situ ammonia decomposition reaction (Ext-ADR), and pure hydrogen (H2 100%), between temperatures of 750°C and 850°C. Constant load tests performed at 800°C with 84% fuel utilization reached the LHV efficiency of 58%. The open-circuit voltage (OCV) of Int-ADR was similar to that of Ext-ADR, confirming that usage of ammonia as fuel in the Ni-YSZ anode involved two steps (i) ammonia decomposition into nitrogen and hydrogen and (ii) electrochemical conversion of hydrogen into steam.Ammonia in SOFCDistribution of Relaxation Time analysisPerformance Analysis of Ammonia in Solid Oxide Fuel Cellstext::conference output::conference proceedings::conference paper