APOLO’s main objective is to provide a quantum leap in the development of advanced power conversion technologies based on the smart combination of an innovative onboard ammonia cracking technology on a Catalytic Membrane Reactor coupled with either 1) an advanced Fuel cell running on pure hydrogen or, 2) a novel ammonia engine running on an ammonia/hydrogen blend targeting in all cases the full decarbonisation of the maritime sector at the TRL5 scale (125 kW output power).